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Barbara, Loïc; Crosta, Xavier; Schmidt, Sabine; Massé, Guillaume (2013): Diatoms and biomarkers in sediments from the Antarctic Peninsula [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.823696, Supplement to: Barbara, L et al. (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

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Abstract:
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.
Project(s):
Climate Change: Learning from the past climate (Past4Future)
Funding:
Seventh Framework Programme (FP7), grant/award no. 243908: Climate Change: Learning from the past climate
Coverage:
Median Latitude: -64.244500 * Median Longitude: -60.120000 * South-bound Latitude: -64.772000 * West-bound Longitude: -62.829000 * North-bound Latitude: -63.717000 * East-bound Longitude: -57.411000
Event(s):
NBP9903_MTC18A (MTC18A) * Latitude: -64.772000 * Longitude: -62.829000 * Elevation: -428.0 m * Recovery: 0.49 m * Location: Antarctic Peninsula * Campaign: NBP9903 * Basis: Nathaniel B. Palmer * Method/Device: MultiCorer (MUC)
Comment:
These data were produced as part of the ERC ICEPROXY and French ANR CLIMICE projects within the scientific network of the ESF PolarClimate HOLOCLIP and FP7 PAST4FUTURE projects.
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
4 datasets

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Datasets listed in this publication series

  1. Barbara, L; Crosta, X; Schmidt, S et al. (2013): Diatom abundances in sediment core NBP00-03-MTC38C. https://doi.org/10.1594/PANGAEA.823709
  2. Barbara, L; Crosta, X; Schmidt, S et al. (2013): Relative concentrations of diene and triene highly branched isoprenoids in sediment core NBP00-03-MTC38C. https://doi.org/10.1594/PANGAEA.823708
  3. Barbara, L; Crosta, X; Schmidt, S et al. (2013): Diatom abundances in sediment core NBP99-03-MTC18A. https://doi.org/10.1594/PANGAEA.823692
  4. Barbara, L; Crosta, X; Schmidt, S et al. (2013): Relative concentrations of diene and triene highly branched isoprenoids in sediment core NBP99-03-MTC18A. https://doi.org/10.1594/PANGAEA.823695