A 220 year record of Antarctic Peninsula climate: the multi-proxy perspective


Contact
Juliane.Mueller [ at ] awi.de

Abstract

The Western Antarctic Peninsula is an exceptionally climate-sensitive area and investigations into its environmental response to recent and past climate changes may support our understanding of the complex interactions in the ice-ocean-atmosphere system. Organic geochemical and micropaleontological analyses of a 210Pb-dated sediment core from the Bransfield Strait (located between the Antarctic Peninsula and the South Shetland Islands) reveal highly variable sea ice conditions over the past 200 years and increased phytoplankton productivity since the 1930s. Concentrations of biomarker lipids (highly branched isoprenoids (IPSO25), phytosterols) and diatom-based sea ice estimates are compared to satellite data and further environmental information derived from Antarctic Peninsula ice cores extending back in time beyond instrumental records. Fluctuations in the sedimentary abundance of the sea ice biomarker IPSO25 (Belt et al., 2016) and sea ice-associated diatom assemblages seem to be linked to changes in atmospheric (ENSO, SAM) and oceanic circulation patterns. Interestingly, both IPSO25- and diatom-based sea ice reconstructions for the spring and winter season, respectively, do not reflect the overall warming trend and sea ice decline observed in the study area over past decades (e.g., Stammerjohn et al., 2008). This observation may highlight the need for an improved understanding and more reasoned interpretations of proxy archives.



Item Type
Conference (Poster)
Authors
Divisions
Primary Division
Programs
Primary Topic
Peer revision
Not peer-reviewed
Publication Status
Published
Event Details
International Conference of Paleocenaography 13, 02 Sep 2019 - 06 Sep 2019, Sydney.
Eprint ID
52241
Cite as
Müller, J. , Martínez Méndez, G. , Esper, O. , Geibert, W. , Kuhn, G. and Haas, C. (2019): A 220 year record of Antarctic Peninsula climate: the multi-proxy perspective , International Conference of Paleocenaography 13, Sydney, 2 September 2019 - 6 September 2019 .


Share

Research Platforms

Campaigns


Actions
Edit Item Edit Item