Abrupt climate warming in East Antarctica during the early Holocene
| Autor: | Bernd Wagner, Oliver Heiri, Holger Cremer, Friederike Wagner-Cremer |
|---|---|
| Přispěvatelé: | TNO Bouw en Ondergrond |
| Jazyk: | angličtina |
| Rok vydání: | 2007 |
| Předmět: |
Archeology
Amery Oasis Climate change allochthon Sediments spatiotemporal analysis Glacial period Southern Ocean Ecology Evolution Behavior and Systematics Holocene Total organic carbon Global and Planetary Change geography geography.geographical_feature_category sedimentation rate Global warming lacustrine deposit organic carbon Northern Hemisphere Sediment Biological materials Geology Glacier East Antarctica dissolved organic carbon Lakes Oceanography climate change climate conditions Antarctica Sedimentation Glacial archives Glaciers Geosciences |
| Zdroj: | Quaternary Science Reviews, 15-16, 26, 2012-2018 |
| Popis: | We report a centennial-scale warming event between 8600 and 8400 cal BP from Amery Oasis, East Antarctica, that is documented by the geochemical record in a lacustrine sediment sequence. The organic carbon content, the C/S ratio, and the sedimentation rate in this core have distinctly elevated values around 8500 y ago reflecting relatively warm and ice-free conditions that led to well-ventilated conditions in the lake and considerable sedimentation of both autochthonous and allochthonous organic matter on the lake bottom. This abrupt warming event occurred concurrently with reported warm climatic conditions in the Southern Ocean while the climate in central East Antarctic remained cold. The comparison of the spatial and temporal variability of warm climatic periods documented in various terrestrial, marine, and glacial archives from East Antarctica elucidates the uniqueness of the centennial-scale warming event in the Amery Oasis. We also discuss a possible correlation of the Amery warming event with the abrupt climatic deterioration around 8200 cal BP on the Northern Hemisphere. © 2007 Elsevier Ltd. All rights reserved. |
| Databáze: | OpenAIRE |
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