Crosta, Xavier; Debret, Maxime; Denis, Delphine; Courty, M A; Ther, Olivier (2007): Relative abundances of sea ice-related diatoms in sediment core MD03-2601 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.788320, Supplement to: Crosta, X et al. (2007): Holocene long- and short-term climate changes off Adélie Land, East Antarctica. Geochemistry, Geophysics, Geosystems, Q11009, https://doi.org/10.1029/2007GC001718
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Abstract:
Diatom data from a marine sediment core give insight on Holocene changes in sea-surface conditions and climate at high southern latitudes off Adélie Land, East Antarctica. The early to mid-Holocene was warmer than the late Holocene with a transition at ~4000 calendar years B. P. Sea ice was less present and spring-summer growing season was greater during the warm period relative to the cold one, thus limiting sea ice diatom production and favoring more open ocean diatom to develop. The long-term Holocene climatic evolution in East Antarctica is explained by a combination of a delayed response to local seasonal insolation changes coupled to the long memory of the Southern Ocean. Abrupt variations of the diatom relative abundances, indicating rapid climate changes, are superimposed to the Holocene long-term trends. Spectral analyses calculate robust frequencies at ~1600 a (where “a” is years), ~1250 a, ~1050 a, ~570 a, ~310 a, ~230 a, ~150–125 a, ~110 a, ~90 a, and ~66 a. Such periods are very close to solar activity cyclicities, except for the periods at ~310 a and ~1250 a, which are close to internal climate variability cyclicities. Wavelet analyses estimate the same periods but indicate nonstationary cyclicities. Rapid climate changes at high southern latitudes may therefore be explained by a combination of external (solar) and internal (thermohaline circulation) forcings.
Related to:
Crosta, Xavier; Denis, Delphine; Ther, Olivier (2008): Sea ice seasonality during the Holocene, Adélie Land, East Antarctica. Marine Micropaleontology, 66(3-4), 222-232, https://doi.org/10.1016/j.marmicro.2007.10.001
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
Denis, Delphine; Crosta, Xavier; Schmidt, Sabine; Carson, Damien S; Ganeshram, Raja S; Renssen, Hans; Crespin, Julien; Ther, Olivier; Billy, Isabelle; Giraudeau, Jacques (2009): Holocene productivity changes off Adélie Land (East Antarctica). Paleoceanography, 24(3), PA3207, https://doi.org/10.1029/2008PA001689
Coverage:
Latitude: -66.051200 * Longitude: 138.557200
Date/Time Start: 2003-02-08T08:51:00 * Date/Time End: 2003-02-08T08:51:00
Minimum DEPTH, sediment/rock: 0.00 m * Maximum DEPTH, sediment/rock: 40.24 m
Event(s):
MD03-2601 (MD032601) * Latitude: -66.051200 * Longitude: 138.557200 * Date/Time: 2003-02-08T08:51:00 * Elevation: -746.0 m * Recovery: 40.3 m * Location: Southern Ocean * Campaign: MD130 (IMAGES X - CADO) * Basis: Marion Dufresne (1995) * Method/Device: Calypso Corer (CALYPSO)
Comment:
Age is given in calendar years BP. Chronology of core MD03-2601 is depicted in Denis et al. 2009 Paleoceanography and Denis et al. 2009 QSR (data at doi:10.1594/PANGAEA.788334).
Investigations were funded by INSU-CNRS through the TARDHOL project. This set was provided for the data compilation of the Past4Future Project.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 2 | AGE | Age | ka BP | Geocode | ||
| 3 | Fragilariopsis curta and Fragilariopsis cylindrus | F. curta+F. cylindrus | % | Crosta, Xavier |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
528 data points