Diatoms and biomarkers in sediments from the Antarctic Peninsula ...

• Main Authors: Barbara, Loïc, Crosta, Xavier, Schmidt, Sabine, Massé, Guillaume
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2013
• Subjects: MultiCorer; NBP9903; Nathaniel B. Palmer; Climate Change Learning from the past climate Past4Future; Antarctic; Antarctic Peninsula; The Antarctic; Antarc*; Sea ice
• Online Access: https://dx.doi.org/10.1594/pangaea.823696; https://doi.pangaea.de/10.1594/PANGAEA.823696

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 ... : 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. ...