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  • 1
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    Subaqueous Mass Movements and Their Consequences: Assessing Geohazards, Environmental Implications and Economic Significance of Subaqueous Landslides (2019)
    London : The Geological Society
    Details
    Keywords: mass movements ; subaqueous landslides ; geohazards
    Description / Table of Contents: Advancing from subaqueous mass movement case studies to providing advice and mitigation / D. Gwyn Lintern, David C. Mosher and Martin Scherwath / Geological Society, London, Special Publications, 477, 1-14, 21 June 2019, https://doi.org/10.1144/SP477-2018-190 --- Tectonics and mass movements --- The nature of small to medium earthquakes along the Eastern Mediterranean passive continental margins, and their possible relationships to landslides and submarine salt-tectonic-related shallow faults / Oded Katz and Yariv Hamiel / Geological Society, London, Special Publications, 477, 15-22, 6 March 2018, https://doi.org/10.1144/SP477.5 --- Spatial and temporal cross-cutting relationships between fault structures and slope failures along the outer Kumano Basin and Nankai accretionary wedge, SW Japan / J. K. Lackey, G. F. Moore, M. Strasser, A. Kopf and C. S. Ferreira / Geological Society, London, Special Publications, 477, 23-36, 6 March 2018, https://doi.org/10.1144/SP477.10 --- Evidence for surface sediment remobilization by earthquakes in the Nankai forearc region from sedimentary records / Natsumi Okutsu, Juichiro Ashi, Asuka Yamaguchi, Tomohisa Irino, Ken Ikehara, Toshiya Kanamatsu, Yusuke Suganuma and Masafumi Murayama / Geological Society, London, Special Publications, 477, 37-45, 27 March 2018, https://doi.org/10.1144/SP477.22 --- Slope failures along the deformation front of the Cascadia margin: linking slide morphology to subduction zone parameters / Michael Riedel, Michelle M. Côté, Morelia Urlaub, Jacob Geersen, Nastasja A. Scholz, Kathrin Naegeli and George D. Spence / Geological Society, London, Special Publications, 477, 47-67, 27 April 2018, https://doi.org/10.1144/SP477.33 --- Slope failure and mass transport processes along the Queen Charlotte Fault, southeastern Alaska / Daniel S. Brothers, Brian D. Andrews, Maureen A. L. Walton, H. Gary Greene, J. Vaughn Barrie, Nathan C. Miller, Uri ten Brink, Amy E. East, Peter J. Haeussler, Jared W. Kluesner and James E. Conrad / Geological Society, London, Special Publications, 477, 69-83, 21 May 2018, https://doi.org/10.1144/SP477.30 --- Slope failure and mass transport processes along the Queen Charlotte Fault Zone, western British Columbia / H. Gary Greene, J. Vaughn Barrie, Daniel S. Brothers, James E. Conrad, Kim Conway, Amy E. East, Randy Enkin, Katherine L. Maier, Stuart P. Nishenko, Maureen A. L. Walton and Kristin M. M. Rohr / Geological Society, London, Special Publications, 477, 85-106, 24 May 2018, https://doi.org/10.1144/SP477.31 --- Mass-wasting processes along the margins of the Ulleung Basin, East Sea: insights from multichannel seismic reflection and multibeam echosounder data / Senay Horozal, Jang-Jun Bahk, Sang Hoon Lee, Deniz Cukur, Roger Urgeles, Gil Young Kim, Seong-Pil Kim, Byong-Jae Ryu and Jin-Ho Kim / Geological Society, London, Special Publications, 477, 107-119, 30 April 2018, https://doi.org/10.1144/SP477.18 --- Assessment of the effect of mass-transport deposits on fault propagation in Penobscot area, offshore Nova Scotia / Tuviere Omeru, Samson I. Bankole, Byami A. Jolly, Obafemi S. Seyi and Joses B. Omojola / Geological Society, London, Special Publications, 477, 121-131, 27 March 2018, https://doi.org/10.1144/SP477.23 --- Open-slope, translational submarine landslide in a tectonically active volcanic continental margin (Licosa submarine landslide, southern Tyrrhenian Sea) / M. Sammartini, A. Camerlenghi, F. Budillon, D. D. Insinga, F. Zgur, A. Conforti, M. Iorio, R. Romeo and R. Tonielli / Geological Society, London, Special Publications, 477, 133-150, 24 May 2018, https://doi.org/10.1144/SP477.34 --- Mass transport deposits, fluid flow and gas hydrates in passive margins --- Mass wasting along the NW African continental margin / S. Krastel, W. Li, M. Urlaub, A. Georgiopoulou, R. B. Wynn, T. Schwenk, C. Stevenson and P. Feldens / Geological Society, London, Special Publications, 477, 151-167, 23 May 2018, https://doi.org/10.1144/SP477.36 --- Subsurface controls on the development of the Cape Fear Slide Complex, central US Atlantic Margin / Jenna C. Hill, Daniel S. Brothers, Matthew J. Hornbach, Derek E. Sawyer, Donna J. Shillington and Anne Bécel / Geological Society, London, Special Publications, 477, 169-181, 28 March 2018, https://doi.org/10.1144/SP477.17 --- Repeated large-scale mass-transport deposits and consequent rapid sedimentation in the western part of the Bay of Bengal, India / Yuzuru Yamamoto, Shun Chiyonobu, Toshiya Kanamatsu, Naokazu Ahagon, Kan Aoike, Nana Kamiya, Takanori Ojima, Takehiro Hirose, Takamitsu Sugihara, Saneatsu Saito, Masataka Kinoshita, Yusuke Kubo, Yasuhiro Yamada and NGHP-02 Scientists / Geological Society, London, Special Publications, 477, 183-193, 28 March 2018, https://doi.org/10.1144/SP477.12 --- Giant mass-transport deposits in the southern Scotia Sea (Antarctica) / Luis Somoza, Teresa Medialdea and Francisco J. González / Geological Society, London, Special Publications, 477, 195-205, 6 March 2018, https://doi.org/10.1144/SP477.2 --- Submarine landslides offshore Yamba, NSW, Australia: an analysis of their timing, downslope motion and possible causes / Thomas Hubble, Serena Yeung, Samantha Clarke, Alan Baxter and Fabio De Blasio / Geological Society, London, Special Publications, 477, 207-222, 30 April 2018, https://doi.org/10.1144/SP477.11 --- Mass transport deposits in modern and outcrop sedimentology --- Entrainment and abrasion of megaclasts during submarine landsliding and their impact on flow behaviour / D. M. Hodgson, H. L. Brooks, A. Ortiz-Karpf, Y. Spychala, D. R. Lee and C. A.-L. Jackson / Geological Society, London, Special Publications, 477, 223-240, 28 March 2018, https://doi.org/10.1144/SP477.26 --- Preferential formation of a slide plane in translational submarine landslide deposits in a Pleistocene forearc basin fill exposed in east-central Japan / Masayuki Utsunomiya, Atsushi Noda and Makoto Otsubo / Geological Society, London, Special Publications, 477, 241-253, 23 March 2018, https://doi.org/10.1144/SP477.3 --- Formation of excess fluid pressure, sediment fluidization and mass-transport deposits in the Plio-Pleistocene Boso forearc basin, central Japan / Nana Kamiya, Masayuki Utsunomiya, Yuzuru Yamamoto, Junichi Fukuoka, Feng Zhang and Weiren Lin / Geological Society, London, Special Publications, 477, 255-264, 26 March 2018, https://doi.org/10.1144/SP477.20 --- Stratal architecture and evolution of a slope mass-transport complex, Isaac Formation, Neoproterozoic Windermere Supergroup, southern Canadian Cordillera, British Columbia, Canada / Lilian Navarro and R. William C. Arnott / Geological Society, London, Special Publications, 477, 265-276, 3 May 2018, https://doi.org/10.1144/SP477.24 --- Tsunami risk assessment --- Extending the terrestrial depositional record of marine geohazards in coastal NW British Columbia / David Huntley, Peter Bobrowsky, James Goff, Catherine Chagué, Douglas Stead, Davide Donati and Danial Mariampillai / Geological Society, London, Special Publications, 477, 277-292, 27 March 2018, https://doi.org/10.1144/SP477.4 --- Tsunami modelling of the 7250 cal years BP Betsiamites submarine landslide / Dominique Turmel, Jacques Locat, Jonathan Leblanc and Geneviève Cauchon-Voyer / Geological Society, London, Special Publications, 477, 293-301, 6 March 2018, https://doi.org/10.1144/SP477.9 --- Bulgarian tsunami on 7 May 2007: numerical investigation of the hypothesis of a submarine-landslide origin / Oleg I. Gusev, Gayaz S. Khakimzyanov and Leonid B. Chubarov / Geological Society, London, Special Publications, 477, 303-313, 23 March 2018, https://doi.org/10.1144/SP477.6 --- Modelling the 1929 Grand Banks slump and landslide tsunami / Finn Løvholt, Irena Schulten, David Mosher, Carl Harbitz and Sebastian Krastel / Geological Society, London, Special Publications, 477, 315-331, 17 April 2018, https://doi.org/10.1144/SP477.28 --- Failure and post-failure analysis of submarine mass movements using geomorphology and geomechanical concepts / Jacques Locat / Geological Society, London, Special Publications, 477, 333-351, 30 April 2018, https://doi.org/10.1144/SP477.27 --- SPLASH: semi-empirical prediction of landslide-generated displacement wave run-up heights / Thierry Oppikofer, Reginald L. Hermanns, Nicholas J. Roberts and Martina Böhme / Geological Society, London, Special Publications, 477, 353-366, 17 March 2018, https://doi.org/10.1144/SP477.1 --- Assessments of subaqueous mass movements in labs, lakes, fjords and coastal areas --- Morphological characterization of submarine slope failures in a semi-enclosed fjord, Frobisher Bay, eastern Canadian Arctic / Robert Deering, Trevor Bell, Donald L. Forbes, Calvin Campbell and Evan Edinger / Geological Society, London, Special Publications, 477, 367-376, 24 May 2018, https://doi.org/10.1144/SP477.35 --- New evidence for a major late Quaternary submarine landslide on the external western levee of Laurentian Fan / Alexandre Normandeau, D. Calvin Campbell, David J. W. Piper and Kimberley A. Jenner / Geological Society, London, Special Publications, 477, 377-387, 28 March 2018, https://doi.org/10.1144/SP477.14 --- Failure dynamics of landslide scars on the lower continental slope of the Tyrrhenian Calabrian margin: insights from an integrated morpho-bathymetric and seismic analysis / Daniele Casalbore, Eleonora Martorelli, Alessandro Bosman, Eleonora Morelli and Francesco Latino Chiocci / Geological Society, London, Special Publications, 477, 389-397, 23 March 2018, https://doi.org/10.1144/SP477.16 --- Quantitative characterization of subaqueous landslides in Lake Zurich (Switzerland) based on a high-resolution bathymetric dataset / M. Strupler, F. S. Anselmetti, M. Hilbe and M. Strasser / Geological Society, London, Special Publications, 477, 399-412, 6 March 2018, https://doi.org/10.1144/SP477.7 --- Tsunami hazard from lacustrine mass wasting in Lake Tekapo, New Zealand / Joshu J. Mountjoy, Xiaoming Wang, Susi Woelz, Sean Fitzsimons, Jamie D. Howarth, Alan R. Orpin and William Power / Geological Society, London, Special Publications, 477, 413-426, 27 April 2018, https://doi.org/10.1144/SP477.21 --- Sediment mass movement of a particle-laden turbidity current based on ultrasound velocity profiling and the distribution of sediment concentration / Shun Nomura, Jumpei Hitomi, Giovanni De Cesare, Yasushi Takeda, Yuzuru Yamamoto and Hide Sakaguchi / Geological Society, London, Special Publications, 477, 427-437, 3 May 2018, https://doi.org/10.1144/SP477.19 --- A two-dimensional layer-averaged numerical model for turbidity currents / Shihao Yang, Yi An and Qingquan Liu / Geological Society, London, Special Publications, 477, 439-454, 23 May 2018, https://doi.org/10.1144/SP477.32 --- Policy, classification and providing advice for mitigation --- A consistent global approach for the morphometric characterization of subaqueous landslides / Michael Clare, Jason Chaytor, Oliver Dabson, Davide Gamboa, Aggeliki Georgiopoulou, Harry Eady, James Hunt, Christopher Jackson, Oded Katz, Sebastian Krastel, Ricardo León, Aaron Micallef, Jasper Moernaut, Roberto Moriconi, Lorena Moscardelli, Christof Mueller, Alexandre Normandeau, Marco Patacci, Michael Steventon, Morelia Urlaub, David Völker, Lesli Wood and Zane Jobe / Geological Society, London, Special Publications, 477, 455-477, 28 March 2018, https://doi.org/10.1144/SP477.15 --- Seismic and lithofacies characterization of a gravity core transect down the submarine Tuaheni Landslide Complex, NE New Zealand / Jannis Kuhlmann, Alan R. Orpin, Joshu J. Mountjoy, Gareth J. Crutchley, Stuart Henrys, Ryan Lunenburg and Katrin Huhn / Geological Society, London, Special Publications, 477, 479-495, 31 July 2018, https://doi.org/10.1144/SP477.37 --- Submarine landslide catalogue onshore/offshore harmonization: Spain as a case study / Ricardo León, Juan Carlos García-Davalillo, David Casas and Carmen Julia Giménez-Moreno / Geological Society, London, Special Publications, 477, 497-510, 31 July 2018, https://doi.org/10.1144/SP477.38 --- Combining in situ monitoring using seabed instruments and numerical modelling to assess the transient stability of underwater slopes / Morelia Urlaub and Heinrich Villinger / Geological Society, London, Special Publications, 477, 511-521, 6 March 2018, https://doi.org/10.1144/SP477.8 --- Effects of stress on failure behaviour of shallow-marine muds from the northern Gulf of Mexico / Brandon Dugan and Xin Zhao / Geological Society, London, Special Publications, 477, 523-536, 27 April 2018, https://doi.org/10.1144/SP477.13 --- Shear margin moraine, mass transport deposits and soft beds revealed by high-resolution P-Cable three-dimensional seismic data in the Hoop area, Barents Sea / Benjamin Bellwald and Sverre Planke / Geological Society, London, Special Publications, 477, 537-548, 28 March 2018, https://doi.org/10.1144/SP477.29 --- Geohazard assessment related to submarine instabilities in Bjørnafjorden, Norway / Brian Carlton, Maarten Vanneste, Carl Fredrik Forsberg, Siren Knudsen, Finn Løvholt, Tore Kvalstad, Søren Holm, Heidi Kjennbakken, Muhammad Adeel Mazhar, Samson Degago and Haflidi Haflidason / Geological Society, London, Special Publications, 477, 549-566, 31 July 2018, https://doi.org/10.1144/SP477.39 --- Providing multidisciplinary scientific advice for coastal planning in Kitimat Arm, British Columbia / Gwyn Lintern, Andrée Blais-Stevens, Cooper Stacey, John Shaw, Peter Bobrowsky, Kim Conway, David Huntley, Kevin Mackillop, Irina Overeem and Martin Scherwath / Geological Society, London, Special Publications, 477, 567-581, 16 April 2019, https://doi.org/10.1144/SP477.40 --- Surficial sediment failures due to the 1929 Grand Banks Earthquake, St Pierre Slope / Irena Schulten, David C. Mosher, Sebastian Krastel, David J. W. Piper and Markus Kienast / Geological Society, London, Special Publications, 477, 583-596, 3 May 2018, https://doi.org/10.1144/SP477.25
    Pages: Online-Ressource (IX, 609 Seiten) , Illustrationen, Diagramme
    ISBN: 9781786203823
    URL: https://sp.lyellcollection.org/content/477/1
    Language: English
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    E-BOOK
  • 2
    Electronic Resource
    Electronic Resource
    Heterogeneity in the Xenopus ribosomal transcription factor xUBF has a molecular basis distinct from that in mammals
    Amsterdam : Elsevier
    FEBS Letters 288 (1991), S. 55-59 
    Details
    ISSN: 0014-5793
    Keywords: RNA polymerase I ; Ribosomal ; Transcription factor ; Xenopus laevis ; xUBF
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0014-5793(91)81002-P
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    A galactic chimney in the Perseus arm of the Milky Way (1996)
    [s.l.] : Nature Publishing Group
    Nature 380 (1996), S. 687-689 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The interstellar medium of our Galaxy is known to exist in several phases, including a hot ionized medium which occupies cavities in the cooler neutral gas. In some cases, large cavities, or superbubbles, seen in our own and other galaxies are related to shells of cool material3. Heiles45 has ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/380687a0
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  • 4
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    Detecting the exposure to Cd and PCBs by means of a non-invasive transcriptomic approach in laboratory and wild contaminated European eels (Anguilla anguilla) (2015)
    Springer
    Details
    Publication Date: 2015-11-14
    Print ISSN: 0944-1344
    Electronic ISSN: 1614-7499
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by Springer
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  • 5
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    The influence of turbidity currents and contour currents on the distribution of deep‐water sediment waves offshore eastern Canada (2019)
    Wiley
    Details
    Publication Date: 2019
    Description: Abstract Sediment waves are commonly observed on the sea floor and often vary in morphology and geometry according to factors such as seabed slope, density and discharge of turbidity currents, and the presence of persistent contour currents. This paper documents the morphology, internal geometry and distribution of deep‐water (4000 to 5000 m) bedforms observed on the sea floor offshore eastern Canada using high‐resolution multibeam bathymetry data and seismic stratigraphy. The bedforms have wavelengths of 〉1 km but fundamentally vary in terms of morphology and internal stratigraphy, and are distinguished into three main types. The first type, characterized by their long‐wavelength crescentic shape, is interpreted as net‐erosional cyclic steps. These cyclic steps were formed by turbidity currents flowing through canyons and overtopping and breaching levées. The second type, characterized by their linear shape and presence on levées, is interpreted as net‐depositional cyclic steps. These upslope migrating bedforms are strongly aggradational, indicating high sediment deposition from turbidity currents. The third type, characterized by their obliqueness to canyons, is observed on an open slope and is interpreted as antidunes. These antidunes were formed by the deflection of the upper dilute, low‐density parts of turbidity currents by contour currents. The modelling of the behaviour of these different types of turbidity currents reveals that fast‐flowing flows form cyclic steps while their upper parts overspill and are entrained westward by contour currents. The interaction between turbidity currents and contour currents results in flow thickening and reduced sediment concentration, which leads to lower flow velocities. Lower velocities, in turn, allow the formation of antidunes instead of cyclic steps because the densiometric Froude number (Fr′) decreases. Therefore, this study shows that both net‐erosional and net‐depositional cyclic steps are distributed along channels where turbidity currents prevail whereas antidunes form on open slopes, in a mixed turbidite/contourite system. This study provides insights into the influence of turbidity currents versus contour currents on the morphology, geometry and distribution of bedforms in a mixed turbidite–contourite system.
    Print ISSN: 0037-0746
    Electronic ISSN: 1365-3091
    Topics: Geosciences
    Published by Wiley
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  • 6
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    Human and climate global-scale imprint on sediment transfer during the Holocene (2019)
    National Academy of Sciences
    Details
    Publication Date: 2019-10-28
    Description: Accelerated soil erosion has become a pervasive feature on landscapes around the world and is recognized to have substantial implications for land productivity, downstream water quality, and biogeochemical cycles. However, the scarcity of global syntheses that consider long-term processes has limited our understanding of the timing, the amplitude, and the extent of soil erosion over millennial time scales. As such, we lack the ability to make predictions about the responses of soil erosion to long-term climate and land cover changes. Here, we reconstruct sedimentation rates for 632 lakes based on chronologies constrained by 3,980 calibrated 14C ages to assess the relative changes in lake-watershed erosion rates over the last 12,000 y. Estimated soil erosion dynamics were then complemented with land cover reconstructions inferred from 43,669 pollen samples and with climate time series from the Max Planck Institute Earth System Model. Our results show that a significant portion of the Earth surface shifted to human-driven soil erosion rate already 4,000 y ago. In particular, inferred soil erosion rates increased in 35% of the watersheds, and most of these sites showed a decrease in the proportion of arboreal pollen, which would be expected with land clearance. Further analysis revealed that land cover change was the main driver of inferred soil erosion in 70% of all studied watersheds. This study suggests that soil erosion has been altering terrestrial and aquatic ecosystems for millennia, leading to carbon (C) losses that could have ultimately induced feedbacks on the climate system.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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    Urban point sources of nutrients were the leading cause for the historical spread of hypoxia across European lakes (2016)
    National Academy of Sciences
    Details
    Publication Date: 2016-10-24
    Description: Enhanced phosphorus (P) export from land into streams and lakes is a primary factor driving the expansion of deep-water hypoxia in lakes during the Anthropocene. However, the interplay of regional scale environmental stressors and the lack of long-term instrumental data often impede analyses attempting to associate changes in land cover with downstream aquatic responses. Herein, we performed a synthesis of data that link paleolimnological reconstructions of lake bottom-water oxygenation to changes in land cover/use and climate over the past 300 years to evaluate whether the spread of hypoxia in European lakes was primarily associated with enhanced P exports from growing urbanization, intensified agriculture, or climatic change. We showed that hypoxia started spreading in European lakes around CE 1850 and was greatly accelerated after CE 1900. Socioeconomic changes in Europe beginning in CE 1850 resulted in widespread urbanization, as well as a larger and more intensively cultivated surface area. However, our analysis of temporal trends demonstrated that the onset and intensification of lacustrine hypoxia were more strongly related to the growth of urban areas than to changes in agricultural areas and the application of fertilizers. These results suggest that anthropogenically triggered hypoxia in European lakes was primarily caused by enhanced P discharges from urban point sources. To date, there have been no signs of sustained recovery of bottom-water oxygenation in lakes following the enactment of European water legislation in the 1970s to 1980s, and the subsequent decrease in domestic P consumption.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 8
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    Sediment dynamics in paired High Arctic lakes revealed from high-resolution swath bathymetry and acoustic stratigraphy surveys (2016)
    Wiley
    Details
    Publication Date: 2016-08-10
    Description: High Arctic lakes are commonly used for paleoclimatic reconstructions because they are particularly sensitive to climate variability. However, the processes leading to sediment deposition and distribution in these lakes are often poorly understood. Here, for the first time in the Canadian High Arctic, we present original data resulting from swath bathymetry and sub-bottom surveys carried out on two lakes at Cape Bounty, Melville Island. The results reveal the dynamic nature of the lakes, in which mass movements deposits and bedforms on the deltas reflect frequent slope instabilities and hyperpycnal flow activity. The analysis of the mass movement deposits reveals that small blocky debris flows/avalanches, debris flows and a slide occurred during the Holocene. These mass movements are believed to have been triggered by earthquakes and potentially by permafrost thawing along the shoreline. Altogether, these mass movement deposits cover more than 30% of the lake floors. Additionally, the river deltas on both lakes were mapped and reveal the presence of several gullies and bedforms. The presence of gullies along the delta front indicates that hyperpycnal flows generated at the river mouth can transport sediment in different trajectories downslope, resulting in a different sediment accumulation pattern and record. The dynamic nature of these two lakes suggests that further analysis on sediment transport and distribution within Arctic lakes is required in order to improve paleoclimatic reconstructions.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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    Oxygen isotope measurements of seawater ( H218O/ H216O): A comparison of cavity ring-down spectroscopy (CRDS) and isotope ratio mass spectrometry (IRMS) (2015)
    Wiley
    Details
    Publication Date: 2015-10-17
    Description: Laser-based spectroscopic techniques, such as cavity ring-down spectroscopy (CRDS), provide a new, cost effective and more widely available approach to measure the oxygen isotope ratio in water molecules, 18 O/ 16 O (δ 18 O), and are used increasingly to measure δ 18 O in the world's oceans. Here, we present results from an interlaboratory comparison designed to evaluate the quality of CRDS-derived measurements, and their consistency with values measured by isotope ratio mass spectrometry (IRMS). We also discuss the influence of salt on instrument performance and sample throughput for the analysis of seawater samples. This study compared measurements of δ 18 O from natural samples with a wide range of salinities (0, 29.4, and 34.6) performed by four independent labs: two using CRDS and two using IRMS. We also compared δ 18 O measurements of Northeast Atlantic Deep Water collected in 2013, 2012, 2009, and 1995 from the AR7W repeat hydrography transect across the Labrador Sea. The within-lab precision of ocean-based CRDS measurements is seen to approach 0.03‰, which is better than the manufacturer's typically stated analytical precision (around +/− 0.05‰), and comparable to that achievable with IRMS. The interlaboratory differences of measurements (highest-lowest) reported by the four labs is taken as an indicator of overall accuracy, and is estimated conservatively as being 〈 0.1‰, with the potential to approach 0.05‰. Overall, these results show that CRDS based 18 O measurements of seawater can be equivalent to high-quality measurements by IRMS.
    Electronic ISSN: 1541-5856
    Topics: Biology , Geosciences
    Published by Wiley on behalf of The Association for the Sciences of Limnology and Oceanography (ASLO).
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    Global spread of hypoxia in freshwater ecosystems during the last three centuries is caused by rising local human pressure (2015)
    Wiley
    Details
    Publication Date: 2015-12-16
    Description: The spread of hypoxia is a threat to aquatic ecosystem functions and services as well as to biodiversity. However, sparse long-term monitoring of lake ecosystems has prevented reconstruction of global hypoxia dynamics while inhibiting investigations into its causes and assessing the resilience capacity of these systems. This study compiles the onset and duration of hypoxia recorded in sediments of 365 lakes worldwide since AD 1700, showing that lacustrine hypoxia started spreading before AD 1900, 70 years prior to hypoxia in coastal zones. This study also shows that the increase of human activities and nutrient release is leading to hypoxia onset. No correlations were found with changes in precipitation or temperature. There is no evidence for a post-1980s return to well-oxygenated lacustrine conditions in industrialized countries despite the implementation of restoration programs. The apparent establishment of stable hypoxic conditions prior to AD 1900 highlights the challenges of a growing nutrient demand, accompanied by increasing global nutrient emissions of our industrialized societies, and climate change. This article is protected by copyright. All rights reserved.
    Print ISSN: 1354-1013
    Electronic ISSN: 1365-2486
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Geography
    Published by Wiley
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