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  • PANGAEA  (20)
  • Geological Society of America (GSA)  (1)
  • Hamburg  (1)
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  • 1
    Keywords: Report ; Forschungsbericht
    Type of Medium: Book
    Pages: 43 S , zahlr. Kt , 30 cm
    Series Statement: Report / Max-Planck-Institut für Meteorologie 173
    Language: English
    Note: Literaturverz. S. 12 - 14
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  • 2
    Publication Date: 2012-07-01
    Description: The Last Interglacial climatic optimum, ca. 128 ka, is the most recent climate interval significantly warmer than present, providing an analogue (albeit imperfect) for ongoing global warming and the effects of Greenland Ice Sheet (GIS) melting on climate over the coming millennium. While some climate models predict an Atlantic meridional overturning circulation (AMOC) strengthening in response to GIS melting, others simulate weakening, leading to cooling in Europe. Here, we present evidence from new proxy-based paleoclimate and ocean circulation reconstructions that show that the strongest warming in western Europe coincided with maximum GIS meltwater runoff and a weaker AMOC early in the Last Interglacial. By performing a series of climate model sensitivity experiments, including enhanced GIS melting, we were able to simulate this configuration of the Last Interglacial climate system and infer information on AMOC slowdown and related climate effects. These experiments suggest that GIS melt inhibited deep convection off the southern coast of Greenland, cooling local climate and reducing AMOC by ∼24% of its present strength. However, GIS melt did not perturb overturning in the Nordic Seas, leaving heat transport to, and thereby temperatures in, Europe unaffected.
    Print ISSN: 0091-7613
    Electronic ISSN: 1943-2682
    Topics: Geosciences
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  • 3
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    PANGAEA
    In:  Supplement to: Denis, Delphine; Crosta, Xavier; Barbara, Loïc; Massé, Guillaume; Renssen, Hans; Ther, Olivier; Giraudeau, Jacques (2010): Sea ice and wind variability during the Holocene in East Antarctica: insight on middleehigh latitude coupling. Quaternary Science Reviews, 29, 3709-3719, https://doi.org/10.1016/j.quascirev.2010.08.007
    Publication Date: 2023-06-27
    Description: Micropaleontological and biomarker data from two high-accumulation marine sites from the Coastal and Continental Shelf Zone (CCSZ) off East Antarctica (Adélie Land at w140°E and eastern Prydz Bay at w77°E) are used to reconstruct Holocene changes in sea ice and wind stress at the basin-wide scale. These data demonstrate congruent increase in sea-ice concentration/persistence and wind stress-related sea-surface turbulence in the two regions since 7 cal ka BP, with a particularly strong signal since 4.5 - 3.5 cal ka BP. Comparison of these high latitude records with sea ice and turbulence records from the southern mid-latitudes highlights distinctive climatic evolutions according to the different latitudinal bands. Sea-ice persistence and turbulence increase in East Antarctica CCSZ are opposite to sea-surface warming and sea-ice retreat recorded after 4.5 - 3.5 cal ka BP in the East Atlantic and Indian sector between 55 and 45°S. At the same period, paleodata suggest SST cooling in all major coastal upwelling systems of the southern hemisphere, caused by the northward transport of subpolar surface waters as a response to southern Westerlies reinforcement. We therefore propose, as suggested for the northern hemisphere, that Holocene changes in the latitudinal insolation gradient, primarily forced by obliquity and precession and amplified by sea-ice and glacial-ice expansions in the Antarctic realm, are responsible for the observed contrasted latitudinal patterns of southern latitudes.
    Keywords: AGE; CALYPSO; Calypso Corer; DEPTH, sediment/rock; Diene/Triene highly branched isoprenois, ratio; IMAGES X - CADO; Marion Dufresne (1995); MD032601; MD03-2601; MD130; Southern Ocean
    Type: Dataset
    Format: text/tab-separated-values, 135 data points
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  • 4
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    PANGAEA
    In:  Supplement to: Kim, Jung-Hyun; Crosta, Xavier; Willmott, Verónica; Renssen, Hans; Bonnin, Jerome; Helmke, Peer; Schouten, Stefan; Sinninghe Damsté, Jaap S (2012): Holocene subsurface temperature variability in the eastern Antarctic continental margin. Geophysical Research Letters, 39, L06705, https://doi.org/10.1029/2012GL051157
    Publication Date: 2023-06-27
    Description: We reconstructed subsurface (~45-200 m water depth) temperature variability in the eastern Antarctic continental margin during the late Holocene, using an archaeal lipid-based temperature proxy (TEX86L). Our results reveal that subsurface temperature changes were probably positively coupled to the variability of warmer, nutrient-rich Modified Circumpolar Deep Water (MCDW, deep water of the Antarctic circumpolar current) intrusion onto the continental shelf. The TEX86L record, in combination with previously published climatic records, indicates that this coupling was probably related to the thermohaline circulation, seasonal variability in sea ice extent, sea temperature, and wind associated with high frequency climate dynamics at low-latitudes such as internal El Niño Southern Oscillation (ENSO). This in turn suggests a linkage between centennial ENSO-like variability at low-latitudes and intrusion variability of MCDW into the eastern Antarctic continental shelf, which might have further impact on ice sheet evolution.
    Keywords: AGE; Calculated from TEX86 (Kim et al., 2010); CALYPSO; Calypso Corer; DEPTH, sediment/rock; IMAGES X - CADO; Marion Dufresne (1995); MD032601; MD03-2601; MD130; Southern Ocean; Sub-surface temperature
    Type: Dataset
    Format: text/tab-separated-values, 46 data points
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  • 5
    Publication Date: 2023-06-27
    Keywords: Age, 14C AMS; Age, 14C calibrated, CALIB 5.0 (Stuiver et al., 2005); Age, dated; Age model; CALYPSO; Calypso Corer; DEPTH, sediment/rock; IMAGES; IMAGES X - CADO; International Marine Global Change Study; Marion Dufresne (1995); MD032601; MD03-2601; MD130; Southern Ocean
    Type: Dataset
    Format: text/tab-separated-values, 14 data points
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  • 6
    Publication Date: 2023-06-27
    Keywords: AGE; Calculated after FOLK; CALYPSO; Calypso Corer; Confidence; Counting; DEPTH, sediment/rock; Grains, counted/analyzed; Grain size, mean; IMAGES; IMAGES X - CADO; International Marine Global Change Study; Marion Dufresne (1995); MD032601; MD03-2601; MD130; Skewness; Sortable-silt mean; Sorting in phi; Southern Ocean; Student_s t
    Type: Dataset
    Format: text/tab-separated-values, 1010 data points
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  • 7
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    PANGAEA
    In:  Supplement to: Denis, Delphine; Crosta, Xavier; Schmidt, Sabine; Carson, Damien S; Ganeshram, Raja S; Renssen, Hans; Bout-Roumazeilles, Viviane; Zaragosi, Sebastien; Martin, Bernard; Cremer, Michel; Giraudeau, Jacques (2009): Holocene glacier and deep water dynamics, Adélie Land region, East Antarctica. Quaternary Science Reviews, 28(13-14), 1291-1303, https://doi.org/10.1016/j.quascirev.2008.12.024
    Publication Date: 2023-06-27
    Description: This study presents a high-resolution multi-proxy investigation of sediment core MD03-2601 and documents major glacier oscillations and deep water activity during the Holocene in the Adélie Land region, East Antarctica. A comparison with surface ocean conditions reveals synchronous changes of glaciers, sea ice and deep water formation at Milankovitch and sub-Milankovitch time scales. We report (1) a deglaciation of the Adélie Land continental shelf from 11 to 8.5 cal ka BP, which occurred in two phases of effective glacier grounding-line retreat at 10.6 and 9 cal ka BP, associated with active deep water formation; (2) a rapid glacier and sea ice readvance centred around 7.7 cal ka BP; and (3) five rapid expansions of the glacier-sea ice systems, during the Mid to Late Holocene, associated to a long-term increase of deep water formation. At Milankovich time scales, we show that the precessionnal component of insolation at high and low latitudes explains the major trend of the glacier-sea ice-ocean system throughout the Holocene, in the Adélie Land region. In addition, the orbitally-forced seasonality seems to control the coastal deep water formation via the sea ice-ocean coupling, which could lead to opposite patterns between north and south high latitudes during the Mid to Late Holocene. At sub-Milankovitch time scales, there are eight events of glacier-sea ice retreat and expansion that occurred during atmospheric cooling events over East Antarctica. Comparisons of our results with other peri-Antarctic records and model simulations from high southern latitudes may suggest that our interpretation on glacier-sea ice-ocean interactions and their Holocene evolutions reflect a more global Antarctic Holocene pattern.
    Keywords: CALYPSO; Calypso Corer; IMAGES; IMAGES X - CADO; International Marine Global Change Study; Marion Dufresne (1995); MD032601; MD03-2601; MD130; Southern Ocean
    Type: Dataset
    Format: application/zip, 5 datasets
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  • 8
    Publication Date: 2023-12-01
    Keywords: AGE; CALYPSO; Calypso Corer; Counting; DEPTH, sediment/rock; IMAGES; IMAGES X - CADO; International Marine Global Change Study; Lamina, number; Marion Dufresne (1995); MD032601; MD03-2601; MD130; Southern Ocean
    Type: Dataset
    Format: text/tab-separated-values, 327 data points
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  • 9
    Publication Date: 2024-04-29
    Description: Several abrupt climatic events during the present interglacial have been associated with catastrophic freshwater forcing, such as the events at 9.2and 8.2 ka BP (Alley et al., 1997; Barber et al., 1999; Marshall et al. 2007; Fleitmann et al. 2008). Proxy evidence suggests that similar events may have occurred during the last interglacial (e.g., Beets & Beets 2003; Beets et al., 2006), suggesting that freshwater‐induced perturbations are an important mechanism for abrupt climate change in interglacial climates. In addition solar variability (Neff et al., 2001; Wang et al., 2005) and explosive volcanic eruptions (Crowley, 2000; Shindell et al., 2003; Jansen et al., 2007) can trigger centennial‐scale climate events during interglacials and may thus have been responsible for a part of interglacial climate variability. We investigate the sensitivity of the present and last interglacial climates to realistic perturbations resulting from freshwater, solar or volcanic forcings. We will compare the differences between the two interglacial periods, between different climate models and evaluate the resulting using proxy archives.
    Keywords: -; Climate Change: Learning from the past climate; File format; File name; File size; Past4Future; Uniform resource locator/link to file; Unit; Variable
    Type: Dataset
    Format: text/tab-separated-values, 616 data points
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  • 10
    Publication Date: 2024-04-16
    Keywords: AGE; Aluminium; CALYPSO; Calypso Corer; DEPTH, sediment/rock; IMAGES; IMAGES X - CADO; Inductively coupled plasma atomic emission spectroscope (ICP-AES); International Marine Global Change Study; Marion Dufresne (1995); MD032601; MD03-2601; MD130; Southern Ocean
    Type: Dataset
    Format: text/tab-separated-values, 254 data points
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