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  • 2010-2014  (3,084,622)
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  • 1
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    Vegetation history of central Chukotka deduced from permafrost paleoenvironmental records of the El'gygytgyn Impact Crater (2012)
    Copernicus Publications
    In:  EPIC3Climate of the Past, Copernicus Publications, 8(4), pp. 1287-1300, ISSN: 1814-9324
    Details
    Publication Date: 2024-04-29
    Description: Frozen sediments from three cores bored in the permafrost surrounding the El’gygytgyn Impact Crater Lake have been studied for pollen, non-pollen palynomorphs, plant macrofossils and rhizopods. The palynological study of these cores contributes to a higher resolution of time intervals presented in a poor temporal resolution in the lacustrine sediments; namely the Allerød and succeeding periods. Moreover, the permafrost records better reflect local environmental changes, allowing a more reliable reconstruction of the local paleoenvironments. The new data confirm that shrub tundra with dwarf birch, shrub alder and willow dominated the lake surroundings during the Allerød warming. Younger Dryas pollen assemblages reflect abrupt changes to grass-sedge-herb dominated environments reflecting significantly drier and cooler climate. Low shrub tundra with dwarf birch and willow dominate the lake vicinity at the onset of the Holocene. The find of larch seeds indicate its local presence around 11 000 cal yr BP and, thus a northward shift of treeline by about 100 km during the early Holocene thermal optimum. Forest tundra with larch and shrub alder stands grew in the area during the early Holocene. After ca. 3500 cal yr BP similar-to-modern plant communities became common in the lake vicinity.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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  • 2
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    Amazonia through time: Andean uplift, climate change, landscape evolution and biodiversity (2010)
    In:  Science vol. 330 no. 6006, pp. 927-931
    Details
    Publication Date: 2024-04-29
    Description: The Amazonian rainforest is arguably the most species-rich terrestrial ecosystem in the world, yet the timing of the origin and volutionary causes of this diversity are a matter of debate. We review the geologic and phylogenetic evidence from Amazonia and compare it with uplift records from the Andes. This uplift and its effect on regional climate fundamentally changed the Amazonian landscape by reconfiguring drainage patterns and creating a vast influx of sediments into the basin. On this “Andean” substrate, a region-wide edaphic mosaic developed that became extremely rich in species, particularly in Western Amazonia. We show that Andean uplift was crucial for the evolution of Amazonian landscapes and ecosystems, and that current biodiversity patterns are rooted deep in the pre-Quaternary.
    Keywords: Amazonia ; evolution ; biodiversity
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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  • 3
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    Description of dinoflagellate wall layers from the Upper Hauterivian (Cretaceous) of a claystone-marlstone succession in the clay-pit Frielingen (2013)
    PANGAEA
    Details
    Publication Date: 2024-04-29
    Keywords: Dinoflagellates, calcareous, wall thickness; Dinoflagellates, calcareous, wall thickness, inside; Dinoflagellates, calcareous, wall thickness, outside; Dinoflagellates, one wall-layer; Dinoflagellates, two wall-layers; Event label; Frielingen; Germany, Lower Saxony; Latitude of event; Longitude of event; Sample ID
    Type: Dataset
    Format: text/tab-separated-values, 150 data points
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  • 4
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    Number of laminae in sediment core MD95-2002, Celtic Margin (2012)
    PANGAEA
    Details
    Publication Date: 2024-04-29
    Keywords: AGE; CALYPSO; Calypso Corer; Climate Change: Learning from the past climate; DEPTH, sediment/rock; IMAGES I; Marion Dufresne (1995); MD101; MD952002; MD95-2002; Meriadzec; Number of lamina; Past4Future
    Type: Dataset
    Format: text/tab-separated-values, 1650 data points
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  • 5
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    Diatom biostratigraphy and sea ice concentration reconstruction from core DA06-139G, Vaigat Strait in Disko Bugt, West Greenland (2012)
    PANGAEA
    In:  Supplement to: Sha, Longbin; Jiang, Hui; Seidenkrantz, Marit-Solveig; Knudsen, Karen Luise; Olsen, Jesper; Kuijpers, Antoon; Liu, Y (2014): A diatom-based sea-ice reconstruction for the Vaigat Strait (Disko Bugt, West Greenland) over the last 5000yr. Palaeogeography, Palaeoclimatology, Palaeoecology, 403, 66-79, https://doi.org/10.1016/j.palaeo.2014.03.028
    Details
    Publication Date: 2024-04-29
    Description: A diatom-based sea-ice concentration (SIC) transfer function is developed using 72 surface samples from west of Greenland and around Iceland, and through comparison with the associated modern SIC. Canonical correspondence analysis on surface sediment diatoms and monthly average of SIC reveals that April SIC is the most important environmental factor controlling the distribution of diatoms in the area, and permits the development of a diatom-based SIC transfer function. The consistency between reconstructed SIC based on diatoms from West Greenland and the instrumental and documentary data during the last ~75 years demonstrates that the diatom-based SIC reconstruction is reliable for studying the palaeoceanography off West Greenland. Relatively warm conditions with strong influence of the Irminger Current (IC) are indicated for the early part of the record (~5000-3860 cal. yr BP), corresponding in time to the latest part of the Holocene Thermal Maximum. The April SIC oscillated around the mean value between 3860 and 1510 cal. yr BP and was above mean afterwards, particularly during the time interval 1510-1120 cal. yr BP and after 650 cal. yr BP, indicating more extensive sea-ice cover in Disko Bugt. A high degree of consistency between the reconstructed April SIC and changes in the diatom species suggests that the sea-ice condition in Disko Bugt is strongly influenced by variations in the relative strength of two components of the West Greenland Current, i.e. the cold East Greenland Current and the relatively warm IC.
    Keywords: Climate Change: Learning from the past climate; DA06-139G; GC; Gravity corer; Past4Future; Vaigat Strait, West Greenland
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 6
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    Paleotemperatures and paleosalinities from the Celtic Margin (Bay of Biscay) (2012)
    PANGAEA
    In:  Supplement to: Eynaud, Frédérique; Malaizé, Bruno; Zaragosi, Sebastien; de Vernal, Anne; Scourse, James D; Pujol, Claude; Cortijo, Elsa; Grousset, Francis E; Penaud, Aurélie; Toucanne, Samuel; Turon, Jean-Louis; Auffret, Gérard A (2012): New constraints on European glacial freshwater releases to the North Atlantic Ocean. Geophysical Research Letters, 39(15), L15601, https://doi.org/10.1029/2012GL052100
    Details
    Publication Date: 2024-04-29
    Description: During the late Quaternary, both external and internal forcings have driven major climatic shifts from glacial to interglacial conditions. Nonlinear climatic steps characterized the transitions leading to these extrema, with intermediate excursions particularly well xpressed in the dynamics of the Northern Hemisphere cryosphere. Here we document the impact of these dynamics on the north-eastern North Atlantic Ocean, focussing on the 35-10 ka interval. Sea-surface salinities have been reconstructed quantitatively based on two independent methods from core MD95-2002, recovered from the northern Bay of Biscay adjacent to the axis of the Manche paleoriver outlet and thus in connection with proximal European ice sheets and glaciers. Quantitative reconstructions deriving from dinocyst and planktonic foraminiferal analyses have been combined within a robust chronology to assess the amplitude and timing of hydrological changes in this region. Our study evidences strong pulsed freshwater discharges which may have impacted the North Atlantic Meridional Overturning Circulation.
    Keywords: CALYPSO; Calypso Corer; Climate Change: Learning from the past climate; IMAGES I; Marion Dufresne (1995); MD101; MD952002; MD95-2002; Meriadzec; Past4Future
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 7
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    Calcareous dinoflagellate cysts, Pirumella multistrata and wall layers from the Upper Hauterivian (Cretaceous) of a claystone-marlstone succession in the clay-pit Frielingen (Hanover-area), NW Germany (2013)
    PANGAEA
    In:  Supplement to: Weinkauf, Manuel F G; Keupp, Helmut; Mutterlose, Jörg (2013): Calcareous dinoflagellates from the Late Hauterivian (Early Cretaceous) of Frielingen, Germany. Documenta Naturae, 192(3), 241-271
    Details
    Publication Date: 2024-04-29
    Description: A pale-dark bedded claystone-marlstone succession of Late Hauterivian age (Simbirskites discofalcatus ammonite Zone; Early Cretaceous), exposed in the clay-pit Frielingen, Germany (Lower Saxony Basin), was investigated with respect to its calcareous dinoflagellate cyst content. This study aimed at a better understanding of the usefulness of calcareous dinoflagellate cysts to reconstruct palaeoenvironments, and an evaluation of the postulated palaeoenvironmental trends associated with Lower Cretaceous pale-dark bedding rhythms. The ratio of abundant taxa, character traits of cysts, and the results of statistical species analyses were used for those analyses. Current models of sea level fluctuations and sea surface temperature were modified on the basis of the composition of calcareous dinoflagellate assemblages. Superimposed on a general sea level rise, a regressive interval with high sea surface water temperatures is reflected by the thick bed 118. This distinctively warm interval is represented by a dark bed that has commonly been interpreted to indicate cooler surface waters. It is therefore necessary to review the palaeoenvironmental interpretation of pale-dark bedding rhythms of claystone successions of the Boreal Realm. Factors other than sea surface temperature seem to be important as well. The species Pirumella edgarii was found to favour time intervals with higher sediment input. The newly described species Pirumella? sp. nov. may perhaps indicate similar environments in warmer water masses. The species Pirumella tanyphloia has been emended, we suggest including it in Pirumella multistrata forma tanyphloia. Moreover, the pithonelloid cysts found in Frielingen are currently the oldest of their kind.
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 8
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    Diatoms and biomarkers in sediments from the Antarctic Peninsula (2013)
    PANGAEA
    In:  Supplement to: Barbara, Loïc; Crosta, Xavier; Schmidt, Sabine; Massé, Guillaume (2013): Diatoms and biomarkers evidence for major changes in sea ice conditions prior the instrumental period in Antarctic Peninsula. Quaternary Science Reviews, 79, 99-110, https://doi.org/10.1016/j.quascirev.2013.07.021
    Details
    Publication Date: 2024-04-29
    Description: The Antarctic Peninsula (AP) has been identified as one of the most rapidly warming region on Earth. Satellite monitoring currently allows for a detailed understanding of the relationship between sea ice extent and duration and atmospheric and oceanic circulations in this region. However, our knowledge on ocean-ice-atmosphere interactions is still relatively poor for the period extending beyond the last 30 years. Here, we describe environmental conditions in Northwestern and Northeastern Antarctic Peninsula areas over the last century using diatom census counts and diatom specific biomarkers (HBIs) in two marine sediment multicores (MTC-38C and -18A, respectively). Diatom census counts and HBIs show abrupt changes between 1935 and 1950, marked by ocean warming and sea ice retreat in both sides of the AP. Since 1950, inferred environmental conditions do not provide evidence for any trend related to the recent warming but demonstrate a pronounced variability on pluri-annual to decadal time scale. We propose that multi-decadal sea ice variations over the last century are forced by the recent warming, while the annual-to-decadal variability is mainly governed by synoptic and regional wind fields in relation with the position and intensity of the atmospheric low-pressure trough around the AP. However, the positive shift of the SAM since the last two decades cannot explain the regional trend observed in this study, probably due to the effect of local processes on the response of our biological proxies.
    Keywords: Antarctic Peninsula; Climate Change: Learning from the past climate; MTC18A; MUC; MultiCorer; Nathaniel B. Palmer; NBP9903; NBP9903_MTC18A; Past4Future
    Type: Dataset
    Format: application/zip, 4 datasets
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  • 9
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    Diatom assemblages, HBIs and TEXL86 in sediment core NBP99-03_10 (2013)
    PANGAEA
    In:  Supplement to: Etourneau, Johan; Collins, L G; Willmott, Verónica; Kim, Jung-Hyun; Barbara, Loïc; Leventer, Amy; Schouten, Stefan; Sinninghe Damsté, Jaap S; Bianchini, A; Klein, Vincent; Crosta, Xavier; Massé, Guillaume (2013): Holocene climate variations in the western Antarctic Peninsula: evidence for sea ice extent predominantly controlled by changes in insolation and ENSO variability. Climate of the Past, 9(4), 1431-1446, https://doi.org/10.5194/cp-9-1431-2013
    Details
    Publication Date: 2024-04-29
    Description: The West Antarctic ice sheet is particularly sensitive to global warming and its evolution and impact on global climate over the next few decades remains difficult to predict. In this context, investigating past sea ice conditions around Antarctica is of primary importance. Here, we document changes in sea ice presence, upper water column temperatures (0-200 m) and primary productivity over the last 9000 yr BP (before present) in the western Antarctic Peninsula (WAP) margin from a sedimentary core collected in the Palmer Deep Basin. Employing a multi-proxy approach, based on the combination of two biomarkers proxies (highly branched isoprenoid (HBI) alkenes for sea ice and TEXL86 for temperature) and micropaleontological data (diatom assemblages), we derived new Holocene records of sea ice conditions and upper water column temperatures. The early Holocene (9000-7000 yr BP) was characterized by a cooling phase with a short sea ice season. During the mid-Holocene (~7000-3800 yr BP), local climate evolved towards slightly colder conditions and a prominent extension of the sea ice season occurred, promoting a favorable environment for intensive diatom growth. The late Holocene (the last ~2100 yr) was characterized by warmer temperatures and increased sea ice presence, accompanied by reduced local primary productivity, likely in response to a shorter growing season compared to the early or mid-Holocene. The gradual increase in annual sea ice duration over the last 7000 yr might have been influenced by decreasing mean annual and spring insolation, despite increasing summer insolation. We postulate that, in addition to precessional changes in insolation, seasonal variability, via changes in the strength of the circumpolar Westerlies and upwelling activity, was further amplified by the increasing frequency/amplitude of the El Nino-Southern Oscillation (ENSO). However, between 3800 and 2100 yr BP, the lack of correlation between ENSO and climate variability in the WAP suggests that other climatic factors might have been more important in controlling WAP climate at this time.
    Keywords: Climate Change: Learning from the past climate; Nathaniel B. Palmer; NBP9903; NBP9903_10; Palmer Deep Basin; Past4Future; PC; Piston corer
    Type: Dataset
    Format: application/zip, 4 datasets
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  • 10
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    Model - data comparison of western African rainfall evolutions during the Last Interglacial (130-115 ka) (2014)
    PANGAEA
    In:  Supplement to: Govin, Aline; Varma, Vidya; Prange, Matthias (2014): Astronomically forced variations in western African rainfall (21°N-20°S) during the Last Interglacial period. Geophysical Research Letters, n/a-n/a, https://doi.org/10.1002/2013GL058999
    Details
    Publication Date: 2024-04-29
    Description: This dataset characterizes the evolution of western African precipitation indicated by marine sediment geochemical records in comparison to transient simulations using CCSM3 global climate model throughout the Last Interglacial (130-115 ka). It contains (1) defined tie-points (age models), newly published stable isotopes of benthic foraminifera and Al/Si log-ratios of eight marine sediment cores from the western African margin and (2) annual and seasonal rainfall anomalies (relative to pre-industrial values) for six characteristic latitudinal bands in western Africa simulated by CCSM3 (two transient simulations: one non-accelerated and one accelerated experiment).
    Keywords: Center for Marine Environmental Sciences; Climate Change: Learning from the past climate; MARUM; Past4Future
    Type: Dataset
    Format: application/zip, 23 datasets
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