| Summary: | XXXVI SCAR Open Science Conference Online 2020 The Antarctic Peninsula (AP) is one of the most sensitive areas to the recent global warming. Over the last 50 years, AP has approximately lost around 75 % of its ice shelves. The main causes of this rapid ice shelf regression are still debated given that the surface atmosphere temperatures (SAT), the subsurface ocean temperatures (SOT), or both can predominantly drive to this fast decline. However, due to the lack of observations, it remains difficult to disentangle the main physical processes primarily acting on the ice shelves. Past records can provide such information. Nevertheless, while a series of SOT records spanning the last millennia around the Northern AP have been produced, only one Holocene ice-core SAT record has been generated, in James Ross Island, Eastern AP. There is therefore no detailed information on the SAT centennial evolution elsewhere around the AP. To fill this gap, we used a recently developed method based on the application of the Glycerol Dialkyl Glycerol Tetraether (GDGT) from sediments of the Limnopolar Lake (62º37’23S, 61º06’24W), Byers Peninsula, South of Livingston Island, in order to investigate the past secular SAT changes over the last 7,500 years in the Western AP. Those data will be then compared to previous reconstructions derived from marine sediment cores and ice cores around the AP. Results and discussion of this ongoing work will be presented for the first time during the OSC SCAR-2020.
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