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  • 1
    Publication Date: 2022-05-26
    Description: © The Author(s), 2019. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Newman, L., Heil, P., Trebilco, R., Katsumata, K., Constable, A., van Wijk, E., Assmann, K., Beja, J., Bricher, P., Colemans, R., Costa, D., Diggs, S., Farneti, R., Fawcett, S., Gille, S. T., Hendry, K. R., Henley, S., Hofmann, E., Maksym, T., MazIoff, M., Meijers, A., Meredith, M. M., Moreau, S., Ozsor, B., Robertson, R., Schloss, I., Schofield, O., Shi, J., Sikes, E., Smith, I. J., Swart, S., Wahlin, A., Williams, G., Williams, M. J. M., Herraiz-Borreguero, L., Kern, S., Liesers, J., Massom, R. A., Melbourne-Thomas, J., Miloslavich, P., & Spreen, G. Delivering sustained, coordinated, and integrated observations of the Southern Ocean for global impact. Frontiers in Marine Science, 6, (2019): 433, doi:10.3389/fmars.2019.00433.
    Description: The Southern Ocean is disproportionately important in its effect on the Earth system, impacting climatic, biogeochemical, and ecological systems, which makes recent observed changes to this system cause for global concern. The enhanced understanding and improvements in predictive skill needed for understanding and projecting future states of the Southern Ocean require sustained observations. Over the last decade, the Southern Ocean Observing System (SOOS) has established networks for enhancing regional coordination and research community groups to advance development of observing system capabilities. These networks support delivery of the SOOS 20-year vision, which is to develop a circumpolar system that ensures time series of key variables, and delivers the greatest impact from data to all key end-users. Although the Southern Ocean remains one of the least-observed ocean regions, enhanced international coordination and advances in autonomous platforms have resulted in progress toward sustained observations of this region. Since 2009, the Southern Ocean community has deployed over 5700 observational platforms south of 40°S. Large-scale, multi-year or sustained, multidisciplinary efforts have been supported and are now delivering observations of essential variables at space and time scales that enable assessment of changes being observed in Southern Ocean systems. The improved observational coverage, however, is predominantly for the open ocean, encompasses the summer, consists of primarily physical oceanographic variables, and covers surface to 2000 m. Significant gaps remain in observations of the ice-impacted ocean, the sea ice, depths 〉2000 m, the air-ocean-ice interface, biogeochemical and biological variables, and for seasons other than summer. Addressing these data gaps in a sustained way requires parallel advances in coordination networks, cyberinfrastructure and data management tools, observational platform and sensor technology, two-way platform interrogation and data-transmission technologies, modeling frameworks, intercalibration experiments, and development of internationally agreed sampling standards and requirements of key variables. This paper presents a community statement on the major scientific and observational progress of the last decade, and importantly, an assessment of key priorities for the coming decade, toward achieving the SOOS vision and delivering essential data to all end-users.
    Description: PH was supported by the Australian Government’s Cooperative Research Centers Program through the Antarctica Climate and Ecosystems Cooperative Research Centre, and the International Space Science Institute’s team grant #406. This work contributes to the Australian Antarctica Science projects 4301 and 4390.
    Keywords: Southern Ocean ; observations ; modeling ; ocean–climate interactions ; ecosystem-based management ; long-term monitoring ; international coordination
    Repository Name: Woods Hole Open Access Server
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  • 2
    Publication Date: 2022-10-26
    Description: © The Author(s), 2019. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Foltz, G. R., Brandt, P., Richter, I., Rodriguez-Fonsecao, B., Hernandez, F., Dengler, M., Rodrigues, R. R., Schmidt, J. O., Yu, L., Lefevre, N., Da Cunha, L. C., Mcphaden, M. J., Araujo, M., Karstensen, J., Hahn, J., Martin-Rey, M., Patricola, C. M., Poli, P., Zuidema, P., Hummels, R., Perez, R. C., Hatje, V., Luebbecke, J. F., Palo, I., Lumpkin, R., Bourles, B., Asuquo, F. E., Lehodey, P., Conchon, A., Chang, P., Dandin, P., Schmid, C., Sutton, A., Giordani, H., Xue, Y., Illig, S., Losada, T., Grodsky, S. A., Gasparinss, F., Lees, T., Mohino, E., Nobre, P., Wanninkhof, R., Keenlyside, N., Garcon, V., Sanchez-Gomez, E., Nnamchi, H. C., Drevillon, M., Storto, A., Remy, E., Lazar, A., Speich, S., Goes, M., Dorrington, T., Johns, W. E., Moum, J. N., Robinson, C., Perruches, C., de Souza, R. B., Gaye, A. T., Lopez-Paragess, J., Monerie, P., Castellanos, P., Benson, N. U., Hounkonnou, M. N., Trotte Duha, J., Laxenairess, R., & Reul, N. The tropical Atlantic observing system. Frontiers in Marine Science, 6(206), (2019), doi:10.3389/fmars.2019.00206.
    Description: he tropical Atlantic is home to multiple coupled climate variations covering a wide range of timescales and impacting societally relevant phenomena such as continental rainfall, Atlantic hurricane activity, oceanic biological productivity, and atmospheric circulation in the equatorial Pacific. The tropical Atlantic also connects the southern and northern branches of the Atlantic meridional overturning circulation and receives freshwater input from some of the world’s largest rivers. To address these diverse, unique, and interconnected research challenges, a rich network of ocean observations has developed, building on the backbone of the Prediction and Research Moored Array in the Tropical Atlantic (PIRATA). This network has evolved naturally over time and out of necessity in order to address the most important outstanding scientific questions and to improve predictions of tropical Atlantic severe weather and global climate variability and change. The tropical Atlantic observing system is motivated by goals to understand and better predict phenomena such as tropical Atlantic interannual to decadal variability and climate change; multidecadal variability and its links to the meridional overturning circulation; air-sea fluxes of CO2 and their implications for the fate of anthropogenic CO2; the Amazon River plume and its interactions with biogeochemistry, vertical mixing, and hurricanes; the highly productive eastern boundary and equatorial upwelling systems; and oceanic oxygen minimum zones, their impacts on biogeochemical cycles and marine ecosystems, and their feedbacks to climate. Past success of the tropical Atlantic observing system is the result of an international commitment to sustained observations and scientific cooperation, a willingness to evolve with changing research and monitoring needs, and a desire to share data openly with the scientific community and operational centers. The observing system must continue to evolve in order to meet an expanding set of research priorities and operational challenges. This paper discusses the tropical Atlantic observing system, including emerging scientific questions that demand sustained ocean observations, the potential for further integration of the observing system, and the requirements for sustaining and enhancing the tropical Atlantic observing system.
    Description: MM-R received funding from the MORDICUS grant under contract ANR-13-SENV-0002-01 and the MSCA-IF-EF-ST FESTIVAL (H2020-EU project 797236). GF, MG, RLu, RP, RW, and CS were supported by NOAA/OAR through base funds to AOML and the Ocean Observing and Monitoring Division (OOMD; fund reference 100007298). This is NOAA/PMEL contribution #4918. PB, MDe, JH, RH, and JL are grateful for continuing support from the GEOMAR Helmholtz Centre for Ocean Research Kiel. German participation is further supported by different programs funded by the Deutsche Forschungsgemeinschaft, the Deutsche Bundesministerium für Bildung und Forschung (BMBF), and the European Union. The EU-PREFACE project funded by the EU FP7/2007–2013 programme (Grant No. 603521) contributed to results synthesized here. LCC was supported by the UERJ/Prociencia-2018 research grant. JOS received funding from the Cluster of Excellence Future Ocean (EXC80-DFG), the EU-PREFACE project (Grant No. 603521) and the BMBF-AWA project (Grant No. 01DG12073C).
    Keywords: Tropical Atlantic Ocean ; Observing system ; Weather ; Climate ; Hurricanes ; Biogeochemistry ; Ecosystems ; Coupled model bias
    Repository Name: Woods Hole Open Access Server
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  • 3
    Publication Date: 2022-10-26
    Description: © The Author(s), 2019. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in [citation], doi:[doi]. Swart, S., Gille, S. T., Delille, B., Josey, S., Mazloff, M., Newman, L., Thompson, A. F., Thomson, J., Ward, B., du Plessis, M. D., Kent, E. C., Girton, J., Gregor, L., Heil, P., Hyder, P., Pezzi, L. P., de Souza, R. B., Tamsitt, V., Weller, R. A., & Zappa, C. J. Constraining Southern Ocean air-sea-ice fluxes through enhanced observations. Frontiers in Marine Science, 6, (2019): 421, doi:10.3389/fmars.2019.00421.
    Description: Air-sea and air-sea-ice fluxes in the Southern Ocean play a critical role in global climate through their impact on the overturning circulation and oceanic heat and carbon uptake. The challenging conditions in the Southern Ocean have led to sparse spatial and temporal coverage of observations. This has led to a “knowledge gap” that increases uncertainty in atmosphere and ocean dynamics and boundary-layer thermodynamic processes, impeding improvements in weather and climate models. Improvements will require both process-based research to understand the mechanisms governing air-sea exchange and a significant expansion of the observing system. This will improve flux parameterizations and reduce uncertainty associated with bulk formulae and satellite observations. Improved estimates spanning the full Southern Ocean will need to take advantage of ships, surface moorings, and the growing capabilities of autonomous platforms with robust and miniaturized sensors. A key challenge is to identify observing system sampling requirements. This requires models, Observing System Simulation Experiments (OSSEs), and assessments of the specific spatial-temporal accuracy and resolution required for priority science and assessment of observational uncertainties of the mean state and direct flux measurements. Year-round, high-quality, quasi-continuous in situ flux measurements and observations of extreme events are needed to validate, improve and characterize uncertainties in blended reanalysis products and satellite data as well as to improve parameterizations. Building a robust observing system will require community consensus on observational methodologies, observational priorities, and effective strategies for data management and discovery.
    Description: SS was funded by a Wallenberg Academy Fellowship (WAF 2015.0186). EK was funded by the NERC ORCHESTRA Project (NE/N018095/1). LP was funded by the Advanced Studies in Oceanography of Medium and High Latitudes (CAPES 23038.004304/2014-28) and the Research Productivity Program (CNPq 304009/2016-4). BdS was a research associate at the F.R.S-FNRS. PeH was supported by the Australian Antarctic Science Projects 4301 and 4390, and the Australian Government’s Cooperative Research Centres Programme through the Antarctic Climate and Ecosystems Cooperative Research Centre and the International Space Science Institute Project 406. SG and MM were funded by National Science Foundation awards OCE-1658001 and PLR-1425989. AT was supported by NASA (NNX15AG42G) and NSF (OCE-1756956).
    Keywords: Air-sea/air-sea-ice fluxes ; Southern Ocean ; Ocean-atmosphere interaction ; Climate ; Ocean-ice interaction
    Repository Name: Woods Hole Open Access Server
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  • 4
    Publication Date: 2022-05-26
    Description: © The Author(s), 2015. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Frontiers in Microbiology 6 (2015): 1090, doi:10.3389/fmicb.2015.01090.
    Description: Antarctica polynyas support intense phytoplankton blooms, impacting their environment by a substantial depletion of inorganic carbon and nutrients. These blooms are dominated by the colony-forming haptophyte Phaeocystis antarctica and they are accompanied by a distinct bacterial population. Yet, the ecological role these bacteria may play in P. antarctica blooms awaits elucidation of their functional gene pool and of the geochemical activities they support. Here, we report on a metagenome (~160 million reads) analysis of the microbial community associated with a P. antarctica bloom event in the Amundsen Sea polynya (West Antarctica). Genomes of the most abundant Bacteroidetes and Proteobacteria populations have been reconstructed and a network analysis indicates a strong functional partitioning of these bacterial taxa. Three of them (SAR92, and members of the Oceanospirillaceae and Cryomorphaceae) are found in close association with P. antarctica colonies. Distinct features of their carbohydrate, nitrogen, sulfur and iron metabolisms may serve to support mutualistic relationships with P. antarctica. The SAR92 genome indicates a specialization in the degradation of fatty acids and dimethylsulfoniopropionate (compounds released by P. antarctica) into dimethyl sulfide, an aerosol precursor. The Oceanospirillaceae genome carries genes that may enhance algal physiology (cobalamin synthesis). Finally, the Cryomorphaceae genome is enriched in genes that function in cell or colony invasion. A novel pico-eukaryote, Micromonas related genome (19.6 Mb, ~94% completion) was also recovered. It contains the gene for an anti-freeze protein, which is lacking in Micromonas at lower latitudes. These draft genomes are representative for abundant microbial taxa across the Southern Ocean surface.
    Description: This work was performed with financial support from NSF Antarctic Sciences awards ANT-1142095 to AP.
    Keywords: Southern Ocean ; Amundsen Sea Polynya ; Phytoplankton bloom ; Phaeocystis ; Micromonas ; Microbial communities ; Metagenomics ; Genome reconstruction
    Repository Name: Woods Hole Open Access Server
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  • 5
    Publication Date: 2022-10-26
    Description: © The Author(s), 2019. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Sloyan, B. M., Wilkin, J., Hill, K. L., Chidichimo, M. P., Cronin, M. F., Johannessen, J. A., Karstensen, J., Krug, M., Lee, T., Oka, E., Palmer, M. D., Rabe, B., Speich, S., von Schuckmann, K., Weller, R. A., & Yu, W. Evolving the physical global ocean observing system for research and application services through international coordination. Frontiers in Marine Science, 6, (2019): 449, doi:10.3389/fmars.2019.00449.
    Description: Climate change and variability are major societal challenges, and the ocean is an integral part of this complex and variable system. Key to the understanding of the ocean’s role in the Earth’s climate system is the study of ocean and sea-ice physical processes, including its interactions with the atmosphere, cryosphere, land, and biosphere. These processes include those linked to ocean circulation; the storage and redistribution of heat, carbon, salt and other water properties; and air-sea exchanges of heat, momentum, freshwater, carbon, and other gasses. Measurements of ocean physics variables are fundamental to reliable earth prediction systems for a range of applications and users. In addition, knowledge of the physical environment is fundamental to growing understanding of the ocean’s biogeochemistry and biological/ecosystem variability and function. Through the progress from OceanObs’99 to OceanObs’09, the ocean observing system has evolved from a platform centric perspective to an integrated observing system. The challenge now is for the observing system to evolve to respond to an increasingly diverse end user group. The Ocean Observations Physics and Climate panel (OOPC), formed in 1995, has undertaken many activities that led to observing system-related agreements. Here, OOPC will explore the opportunities and challenges for the development of a fit-for-purpose, sustained and prioritized ocean observing system, focusing on physical variables that maximize support for fundamental research, climate monitoring, forecasting on different timescales, and society. OOPC recommendations are guided by the Framework for Ocean Observing which emphasizes identifying user requirements by considering time and space scales of the Essential Ocean Variables. This approach provides a framework for reviewing the adequacy of the observing system, looking for synergies in delivering an integrated observing system for a range of applications and focusing innovation in areas where existing technologies do not meet these requirements.
    Description: BS received support from the Centre for Southern Hemisphere Oceans Research, a collaboration between the CSIRO and the Qingdao National Laboratory for Marine Science and Technology and the Australian Government Department of the Environment and CSIRO through the Australian Climate Change Science Programme and by the National Environmental Science Program. JK was supported by the European Union’s Horizon 2020 Research and Innovation Programme under the grant agreement no. 633211 (AtlantOS). MP was supported by the Met Office Hadley Centre Climate Programme funded by the BEIS and Defra. SS was supported by the Ecole Normale Supérieure, CNRS, and Ifremer funded by the European Union’s Horizon 2020 Research and Innovation Programme under the grant agreement no. 633211 (AtlantOS), CNES, and ANR grants.
    Keywords: Observing system evaluation ; Observing system design ; Sustained observations ; Observing networks ; Observation platforms ; Climate ; Weather ; Operational services
    Repository Name: Woods Hole Open Access Server
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  • 6
    Publication Date: 2022-10-26
    Description: © The Author(s), 2019. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Benway, H. M., Lorenzoni, L., White, A. E., Fiedler, B., Levine, N. M., Nicholson, D. P., DeGrandpre, M. D., Sosik, H. M., Church, M. J., O'Brien, T. D., Leinen, M., Weller, R. A., Karl, D. M., Henson, S. A., & Letelier, R. M. Ocean time series observations of changing marine ecosystems: An era of integration, synthesis, and societal applications. Frontiers in Marine Science, 6, (2019): 393, doi:10.3389/fmars.2019.00393.
    Description: Sustained ocean time series are critical for characterizing marine ecosystem shifts in a time of accelerating, and at times unpredictable, changes. They represent the only means to distinguish between natural and anthropogenic forcings, and are the best tools to explore causal links and implications for human communities that depend on ocean resources. Since the inception of sustained ocean observations, ocean time series have withstood many challenges, most prominently availability of uninterrupted funding and retention of trained personnel. This OceanObs’19 review article provides an overarching vision for sustained ocean time series observations for the next decade, focusing on the growing challenges of maintaining sustained ocean time series, including ship-based and autonomous coastal and open-ocean platforms, as well as remote sensing. In addition to increased diversification of funding sources to include the private sector, NGOs, and other groups, more effective engagement of stakeholders and other end-users will be critical to ensure the sustainability of ocean time series programs. Building a cohesive international time series network will require dedicated capacity to coordinate across observing programs and leverage existing infrastructure and platforms of opportunity. This review article outlines near-term observing priorities and technology needs; explores potential mechanisms to broaden ocean time series data applications and end-user communities; and describes current tools and future requirements for managing increasingly complex multi-platform data streams and developing synthesis products that support science and society. The actionable recommendations outlined herein ultimately form the basis for a robust, sustainable, fit-for-purpose time series network that will foster a predictive understanding of changing ocean systems for the benefit of society.
    Description: This work was led by HB in the Ocean Carbon and Biogeochemistry (OCB) Project Office, which is supported by the NSF OCE (1558412) and the NASA (NNX17AB17G).
    Keywords: Ocean time series ; Marine ecosystems ; Climate ; End-users ; Synthesis ; Sustained observations
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  • 7
    Publication Date: 2015-08-01
    Description: Earth's mightiest ocean current, the Antarctic Circumpolar Current (ACC), regulates the exchange of heat and carbon between the ocean and the atmosphere, and influences vertical ocean structure, deep-water production and the global distribution of nutrients and chemical tracers. The eastward-flowing ACC occupies a unique circumglobal pathway in the Southern Ocean that was enabled by the tectonic opening of key oceanic gateways during the break-up of Gondwana (for example, by the opening of the Tasmanian Gateway, which connects the Indian and Pacific oceans). Although the ACC is a key component of Earth's present and past climate system, the timing of the appearance of diagnostic features of the ACC (for example, low zonal gradients in water-mass tracer fields) is poorly known and represents a fundamental gap in our understanding of Earth history. Here we show, using geophysically determined positions of continent-ocean boundaries, that the deep Tasmanian Gateway opened 33.5 +/- 1.5 million years ago (the errors indicate uncertainty in the boundary positions). Following this opening, sediments from Indian and Pacific cores recorded Pacific-type neodymium isotope ratios, revealing deep westward flow equivalent to the present-day Antarctic Slope Current. We observe onset of the ACC at around 30 million years ago, when Southern Ocean neodymium isotopes record a permanent shift to modern Indian-Atlantic ratios. Our reconstructions of ocean circulation show that massive reorganization and homogenization of Southern Ocean water masses coincided with migration of the northern margin of the Tasmanian Gateway into the mid-latitude westerly wind band, which we reconstruct at 64 degrees S, near to the northern margin. Onset of the ACC about 30 million years ago coincided with major changes in global ocean circulation and probably contributed to the lower atmospheric carbon dioxide levels that appear after this time.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Scher, Howie D -- Whittaker, Joanne M -- Williams, Simon E -- Latimer, Jennifer C -- Kordesch, Wendy E C -- Delaney, Margaret L -- England -- Nature. 2015 Jul 30;523(7562):580-3. doi: 10.1038/nature14598.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Earth and Ocean Sciences, University of South Carolina, Columbia, South Carolina 29208, USA. ; Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, Tasmania 7001, Australia. ; EarthByte group, School of Geosciences, The University of Sydney, Sydney, New South Wales 2006, Australia. ; Department of Earth and Environmental Systems, Indiana State University, Terre Haute, Indiana 47809, USA. ; Department of Ocean and Earth Science, National Oceanography Centre, University of Southampton, Waterfront Campus, European Way, Southampton SO14 3ZH, UK. ; Ocean Sciences Department and Institute of Marine Sciences, University of California Santa Cruz, Santa Cruz, California 95064, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26223626" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antarctic Regions ; Atmosphere/chemistry ; Carbon/analysis ; Carbon Dioxide/analysis ; Climate ; Fishes ; Fossils ; Geologic Sediments/chemistry ; History, Ancient ; Hot Temperature ; Isotopes ; Neodymium/analysis ; Oceans and Seas ; Seawater/analysis/chemistry ; Tooth ; *Water Movements ; *Wind
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 8
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    Nature Publishing Group (NPG)
    Publication Date: 2015-01-17
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zastrow, Mark -- England -- Nature. 2015 Jan 15;517(7534):256-7. doi: 10.1038/517256a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25592515" target="_blank"〉PubMed〈/a〉
    Keywords: Climate ; *Earth (Planet) ; Environmental Monitoring/*instrumentation ; Environmental Pollution/analysis ; Extraterrestrial Environment/chemistry ; Models, Theoretical ; Politics ; Seasons ; *Spacecraft ; United States ; United States National Aeronautics and Space Administration
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 9
    Publication Date: 2015-06-13
    Description: Our current understanding of ocean-atmosphere-cryosphere interactions at ice-age terminations relies largely on assessments of the most recent (last) glacial-interglacial transition, Termination I (T-I). But the extent to which T-I is representative of previous terminations remains unclear. Testing the consistency of termination processes requires comparison of time series of critical climate parameters with detailed absolute and relative age control. However, such age control has been lacking for even the penultimate glacial termination (T-II), which culminated in a sea-level highstand during the last interglacial period that was several metres above present. Here we show that Heinrich Stadial 11 (HS11), a prominent North Atlantic cold episode, occurred between 135 +/- 1 and 130 +/- 2 thousand years ago and was linked with rapid sea-level rise during T-II. Our conclusions are based on new and existing data for T-II and the last interglacial that we collate onto a single, radiometrically constrained chronology. The HS11 cold episode punctuated T-II and coincided directly with a major deglacial meltwater pulse, which predominantly entered the North Atlantic Ocean and accounted for about 70 per cent of the glacial-interglacial sea-level rise. We conclude that, possibly in response to stronger insolation and CO2 forcing earlier in T-II, the relationship between climate and ice-volume changes differed fundamentally from that of T-I. In T-I, the major sea-level rise clearly post-dates Heinrich Stadial 1. We also find that HS11 coincided with sustained Antarctic warming, probably through a bipolar seesaw temperature response, and propose that this heat gain at high southern latitudes promoted Antarctic ice-sheet melting that fuelled the last interglacial sea-level peak.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Marino, G -- Rohling, E J -- Rodriguez-Sanz, L -- Grant, K M -- Heslop, D -- Roberts, A P -- Stanford, J D -- Yu, J -- England -- Nature. 2015 Jun 11;522(7555):197-201. doi: 10.1038/nature14499.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Research School of Earth Sciences, The Australian National University, Canberra, Australian Capital Territory 2601, Australia. ; 1] Research School of Earth Sciences, The Australian National University, Canberra, Australian Capital Territory 2601, Australia [2] Ocean and Earth Science, University of Southampton, National Oceanography Centre, Southampton SO14 3ZH, UK. ; Department of Geography, Wallace Building, Swansea University, Singleton Park, Swansea SA2 8PP, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26062511" target="_blank"〉PubMed〈/a〉
    Keywords: Antarctic Regions ; Aquatic Organisms/metabolism ; Atlantic Ocean ; Climate ; Foraminifera/metabolism ; History, Ancient ; *Ice Cover ; Mediterranean Region ; Mediterranean Sea ; Plankton/metabolism ; Seawater/*analysis ; Temperature
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 10
    Publication Date: 2015-02-13
    Description: Atmospheric CO2 fluctuations over glacial-interglacial cycles remain a major challenge to our understanding of the carbon cycle and the climate system. Leading hypotheses put forward to explain glacial-interglacial atmospheric CO2 variations invoke changes in deep-ocean carbon storage, probably modulated by processes in the Southern Ocean, where much of the deep ocean is ventilated. A central aspect of such models is that, during deglaciations, an isolated glacial deep-ocean carbon reservoir is reconnected with the atmosphere, driving the atmospheric CO2 rise observed in ice-core records. However, direct documentation of changes in surface ocean carbon content and the associated transfer of carbon to the atmosphere during deglaciations has been hindered by the lack of proxy reconstructions that unambiguously reflect the oceanic carbonate system. Radiocarbon activity tracks changes in ocean ventilation, but not in ocean carbon content, whereas proxies that record increased deglacial upwelling do not constrain the proportion of upwelled carbon that is degassed relative to that which is taken up by the biological pump. Here we apply the boron isotope pH proxy in planktic foraminifera to two sediment cores from the sub-Antarctic Atlantic and the eastern equatorial Pacific as a more direct tracer of oceanic CO2 outgassing. We show that surface waters at both locations, which partly derive from deep water upwelled in the Southern Ocean, became a significant source of carbon to the atmosphere during the last deglaciation, when the concentration of atmospheric CO2 was increasing. This oceanic CO2 outgassing supports the view that the ventilation of a deep-ocean carbon reservoir in the Southern Ocean had a key role in the deglacial CO2 rise, although our results allow for the possibility that processes operating in other regions may also have been important for the glacial-interglacial ocean-atmosphere exchange of carbon.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Martinez-Boti, M A -- Marino, G -- Foster, G L -- Ziveri, P -- Henehan, M J -- Rae, J W B -- Mortyn, P G -- Vance, D -- England -- Nature. 2015 Feb 12;518(7538):219-22. doi: 10.1038/nature14155.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Ocean and Earth Science, National Oceanography Centre Southampton, University of Southampton Waterfront Campus, Southampton SO14 3ZH, UK. ; 1] Institute of Environmental Science and Technology (ICTA), Universitat Autonoma de Barcelona, Bellaterra, Catalonia, 08193, Spain [2] Research School of Earth Sciences, The Australian National University, Canberra, Australian Capital Territory 2601, Australia. ; 1] Institute of Environmental Science and Technology (ICTA), Universitat Autonoma de Barcelona, Bellaterra, Catalonia, 08193, Spain [2] Institucio Catalana de Recerca i Estudis Avancats, ICREA, Barcelona, Catalonia, 08010, Spain [3] Earth and Climate Cluster, Department of Earth Sciences, Faculty of Earth and Life Sciences, VU Universiteit Amsterdam, 1081HV Amsterdam, The Netherlands. ; 1] Ocean and Earth Science, National Oceanography Centre Southampton, University of Southampton Waterfront Campus, Southampton SO14 3ZH, UK [2] Department of Geology and Geophysics, Yale University, New Haven, Connecticut 06511, USA. ; 1] Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125, USA [2] Department of Earth and Environmental Sciences, University of St Andrews, St Andrews KY16 9AL, UK. ; 1] Institute of Environmental Science and Technology (ICTA), Universitat Autonoma de Barcelona, Bellaterra, Catalonia, 08193, Spain [2] Department of Geography, Universitat Autonoma de Barcelona, Bellaterra, Catalonia, 08193, Spain. ; Institute of Geochemistry and Petrology, Department of Earth Sciences, ETH Zurich, NW D81.4, Zurich 8092, Switzerland.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25673416" target="_blank"〉PubMed〈/a〉
    Keywords: Atmosphere/chemistry ; Boron/*analysis/*chemistry ; Carbon Dioxide/*analysis ; Climate ; Foraminifera ; Freezing ; History, Ancient ; Hydrogen-Ion Concentration ; Ice Cover/*chemistry ; Isotopes ; Oceans and Seas ; Seawater/*chemistry
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 11
    Publication Date: 2015-11-06
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Monastersky, Richard -- England -- Nature. 2015 Nov 5;527(7576):26-9. doi: 10.1038/527026a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26536941" target="_blank"〉PubMed〈/a〉
    Keywords: Agriculture/history ; Archaeology ; Civilization/*history ; Climate ; Colorado ; Computer Simulation ; Droughts/history ; History, Medieval ; Human Migration/*history ; New Mexico ; Politics ; Time Factors ; Violence
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    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 12
    Publication Date: 2015-11-06
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Whiteman, Gail -- Hoster, Harry -- England -- Nature. 2015 Nov 5;527(7576):38. doi: 10.1038/527038a.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Lancaster University, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26536947" target="_blank"〉PubMed〈/a〉
    Keywords: Biodiversity ; Climate ; Congresses as Topic ; Conservation of Natural Resources/economics/*legislation & jurisprudence ; Environmental Policy/*legislation & jurisprudence ; Health ; Humans ; Paris ; Urban Renewal/trends ; Vehicle Emissions/*analysis/legislation & jurisprudence/*prevention & control
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 13
    Publication Date: 2015-03-13
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉LaDue, Nicole D -- England -- Nature. 2015 Mar 12;519(7542):131. doi: 10.1038/519131a.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Geology and Environmental Geosciences at Northern Illinois University in DeKalb.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25762247" target="_blank"〉PubMed〈/a〉
    Keywords: Climate ; Earth Sciences/*education ; Schools ; Teaching/*trends ; United States ; Weather
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    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 14
    Publication Date: 2016-04-07
    Description: As the last habitable continent colonized by humans, the site of multiple domestication hotspots, and the location of the largest Pleistocene megafaunal extinction, South America is central to human prehistory. Yet remarkably little is known about human population dynamics during colonization, subsequent expansions, and domestication. Here we reconstruct the spatiotemporal patterns of human population growth in South America using a newly aggregated database of 1,147 archaeological sites and 5,464 calibrated radiocarbon dates spanning fourteen thousand to two thousand years ago (ka). We demonstrate that, rather than a steady exponential expansion, the demographic history of South Americans is characterized by two distinct phases. First, humans spread rapidly throughout the continent, but remained at low population sizes for 8,000 years, including a 4,000-year period of 'boom-and-bust' oscillations with no net growth. Supplementation of hunting with domesticated crops and animals had a minimal impact on population carrying capacity. Only with widespread sedentism, beginning ~5 ka, did a second demographic phase begin, with evidence for exponential population growth in cultural hotspots, characteristic of the Neolithic transition worldwide. The unique extent of humanity's ability to modify its environment to markedly increase carrying capacity in South America is therefore an unexpectedly recent phenomenon.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Goldberg, Amy -- Mychajliw, Alexis M -- Hadly, Elizabeth A -- England -- Nature. 2016 Apr 14;532(7598):232-5. doi: 10.1038/nature17176. Epub 2016 Apr 6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Biology Department, Stanford University, Stanford, California 94305, USA. ; Woods Institute, Stanford University, Stanford, California 94305, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27049941" target="_blank"〉PubMed〈/a〉
    Keywords: Agriculture/history ; Archaeology ; Climate ; Geographic Mapping ; History, Ancient ; Human Migration/*history ; Humans ; Population Dynamics/*history ; Radiometric Dating ; Siberia/ethnology ; South America
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    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 15
    Publication Date: 2016-03-25
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tollefson, Jeff -- England -- Nature. 2016 Mar 24;531(7595):421-2. doi: 10.1038/531421a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27008945" target="_blank"〉PubMed〈/a〉
    Keywords: Antarctic Regions ; Climate ; Ecosystem ; Oceanography/*instrumentation/*methods ; Oceans and Seas ; Robotics/*instrumentation ; Salinity ; Seawater/chemistry ; Temperature
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    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 16
    Publication Date: 2016-02-04
    Description: No single mechanism can account for the full amplitude of past atmospheric carbon dioxide (CO2) concentration variability over glacial-interglacial cycles. A build-up of carbon in the deep ocean has been shown to have occurred during the Last Glacial Maximum. However, the mechanisms responsible for the release of the deeply sequestered carbon to the atmosphere at deglaciation, and the relative importance of deep ocean sequestration in regulating millennial-timescale variations in atmospheric CO2 concentration before the Last Glacial Maximum, have remained unclear. Here we present sedimentary redox-sensitive trace-metal records from the Antarctic Zone of the Southern Ocean that provide a reconstruction of transient changes in deep ocean oxygenation and, by inference, respired carbon storage throughout the last glacial cycle. Our data suggest that respired carbon was removed from the abyssal Southern Ocean during the Northern Hemisphere cold phases of the deglaciation, when atmospheric CO2 concentration increased rapidly, reflecting--at least in part--a combination of dwindling iron fertilization by dust and enhanced deep ocean ventilation. Furthermore, our records show that the observed covariation between atmospheric CO2 concentration and abyssal Southern Ocean oxygenation was maintained throughout most of the past 80,000 years. This suggests that on millennial timescales deep ocean circulation and iron fertilization in the Southern Ocean played a consistent role in modifying atmospheric CO2 concentration.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jaccard, Samuel L -- Galbraith, Eric D -- Martinez-Garcia, Alfredo -- Anderson, Robert F -- England -- Nature. 2016 Feb 11;530(7589):207-10. doi: 10.1038/nature16514. Epub 2016 Feb 3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Geological Sciences, University of Bern, Bern, Switzerland. ; Oeschger Center for Climate Change Research, University of Bern, Bern, Switzerland. ; Department of Earth and Planetary Sciences, McGill University, Montreal, Canada. ; Institucio Catalana de Recerca i Estudis Avancats (ICREA), Barcelona, Spain. ; Institut de Ciencia i Tecnologia Ambientals and Department of Mathematics, Universitat Autonoma de Barcelona, Barcelona, Spain. ; Geological Institute, ETH Zurich, Zurich, Switzerland. ; Climate Geochemistry Department, Max Planck Institute for Chemistry, Mainz, Germany. ; Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26840491" target="_blank"〉PubMed〈/a〉
    Keywords: Antarctic Regions ; Atmosphere/*chemistry ; Carbon Dioxide/*analysis/history/metabolism ; Carbon Sequestration ; Cell Respiration ; Climate ; Dust ; Geologic Sediments/chemistry ; History, Ancient ; *Ice Cover ; Iron/analysis/chemistry ; Oceans and Seas ; Oxidation-Reduction ; Oxygen/*analysis/metabolism ; Seawater/*chemistry ; Temperature ; Water Movements
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    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 17
    Publication Date: 2016-01-15
    Description: The past rapid growth of Northern Hemisphere continental ice sheets, which terminated warm and stable climate periods, is generally attributed to reduced summer insolation in boreal latitudes. Yet such summer insolation is near to its minimum at present, and there are no signs of a new ice age. This challenges our understanding of the mechanisms driving glacial cycles and our ability to predict the next glacial inception. Here we propose a critical functional relationship between boreal summer insolation and global carbon dioxide (CO2) concentration, which explains the beginning of the past eight glacial cycles and might anticipate future periods of glacial inception. Using an ensemble of simulations generated by an Earth system model of intermediate complexity constrained by palaeoclimatic data, we suggest that glacial inception was narrowly missed before the beginning of the Industrial Revolution. The missed inception can be accounted for by the combined effect of relatively high late-Holocene CO2 concentrations and the low orbital eccentricity of the Earth. Additionally, our analysis suggests that even in the absence of human perturbations no substantial build-up of ice sheets would occur within the next several thousand years and that the current interglacial would probably last for another 50,000 years. However, moderate anthropogenic cumulative CO2 emissions of 1,000 to 1,500 gigatonnes of carbon will postpone the next glacial inception by at least 100,000 years. Our simulations demonstrate that under natural conditions alone the Earth system would be expected to remain in the present delicately balanced interglacial climate state, steering clear of both large-scale glaciation of the Northern Hemisphere and its complete deglaciation, for an unusually long time.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ganopolski, A -- Winkelmann, R -- Schellnhuber, H J -- England -- Nature. 2016 Jan 14;529(7585):200-3. doi: 10.1038/nature16494.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Potsdam Institute for Climate Impact Research, 14412 Potsdam, Germany. ; Physics Institute, Potsdam University, 14476 Potsdam, Germany. ; Santa Fe Institute, Santa Fe, New Mexico 87501, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26762457" target="_blank"〉PubMed〈/a〉
    Keywords: Atmosphere/chemistry ; Carbon Dioxide/*analysis ; Climate ; Earth (Planet) ; *Ice Cover ; *Models, Theoretical ; Seasons ; Time Factors
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    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 18
    Publication Date: 2015-03-06
    Description: Over 20% of Earth's terrestrial surface is underlain by permafrost with vast stores of carbon that, once thawed, may represent the largest future transfer of carbon from the biosphere to the atmosphere. This process is largely dependent on microbial responses, but we know little about microbial activity in intact, let alone in thawing, permafrost. Molecular approaches have recently revealed the identities and functional gene composition of microorganisms in some permafrost soils and a rapid shift in functional gene composition during short-term thaw experiments. However, the fate of permafrost carbon depends on climatic, hydrological and microbial responses to thaw at decadal scales. Here we use the combination of several molecular 'omics' approaches to determine the phylogenetic composition of the microbial communities, including several draft genomes of novel species, their functional potential and activity in soils representing different states of thaw: intact permafrost, seasonally thawed active layer and thermokarst bog. The multi-omics strategy reveals a good correlation of process rates to omics data for dominant processes, such as methanogenesis in the bog, as well as novel survival strategies for potentially active microbes in permafrost.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hultman, Jenni -- Waldrop, Mark P -- Mackelprang, Rachel -- David, Maude M -- McFarland, Jack -- Blazewicz, Steven J -- Harden, Jennifer -- Turetsky, Merritt R -- McGuire, A David -- Shah, Manesh B -- VerBerkmoes, Nathan C -- Lee, Lang Ho -- Mavrommatis, Kostas -- Jansson, Janet K -- England -- Nature. 2015 May 14;521(7551):208-12. doi: 10.1038/nature14238. Epub 2015 Mar 4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Earth Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California, 94720, USA. ; US Geological Survey, 345 Middlefield Road, Menlo Park, California 94025, USA. ; 1] Biology Department, 18111 Nordhoff Street, California State University Northridge, Northridge, California 91330, USA [2] US Department of Energy Joint Genome Institute, 2800 Mitchell Drive, Walnut Creek, California 94598, USA. ; Department of Integrative Biology, 50 Stone Road East, University of Guelph, Guelph, Ontario N1G 2W1, Canada. ; US Geological Survey, Alaska Cooperative Fish and Wildlife Research Unit, 211A Irving I Building, University of Alaska Fairbanks, Fairbanks, Alaska 99775, USA. ; Chemical Sciences Division, One Bethel Valley Road, Building 1059, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6420, USA. ; Graduate School of Genome Science and Technology, University of Tennessee and Oak Ridge National Laboratory, 2510 River Drive, Knoxville, Tennessee 37996, USA. ; US Department of Energy Joint Genome Institute, 2800 Mitchell Drive, Walnut Creek, California 94598, USA. ; 1] Earth Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California, 94720, USA [2] US Department of Energy Joint Genome Institute, 2800 Mitchell Drive, Walnut Creek, California 94598, USA [3] Department of Plant and Microbial Biology, 111 Koshland Hall, University of California, Berkeley, Berkeley, California 94720, USA [4] Center for Permafrost Research (CENPERM), Department of Biology, Universitetsparken 15, University of Copenhagen, Copenhagen, DK-2100 Copenhagen, Denmark.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25739499" target="_blank"〉PubMed〈/a〉
    Keywords: Alaska ; Atmosphere/chemistry ; Carbon Cycle ; Climate ; Denitrification ; Freezing ; Genome, Bacterial/*genetics ; Iron/metabolism ; Metagenome/*genetics ; Methane/metabolism ; Microbiota/genetics/*physiology ; Nitrates/metabolism ; Nitrogen/metabolism ; Oxidation-Reduction ; Permafrost/*microbiology ; Phylogeny ; Seasons ; *Soil Microbiology ; Sulfur/metabolism ; Time Factors ; *Wetlands
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    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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