Increased dust deposition in the Pacific Southern Ocean during glacial periods

Dust deposition in the Southern Ocean constitutes a critical modulator of past global climate variability, but how it has varied temporally and geographically is underdetermined. Here, we present data sets of glacial-interglacial dust-supply cycles from the largest Southern Ocean sector, the polar S...

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Bibliographic Details
Published in:Science
Main Authors: Lamy, Frank, Gersonde, Rainer, Winckler, Gisela, Esper, Oliver, Jaeschke, Andrea, Kuhn, Gerhard, Ullermann, Johannes, Martínez-Garcia, Alfredo, Lambert, Fabrice, Kilian, Rolf
Format: Article in Journal/Newspaper
Language:unknown
Published: AAAS 2014
Subjects:
Antarc*
Antarctica
Southern Ocean
Online Access:https://epic.awi.de/id/eprint/34913/
https://epic.awi.de/id/eprint/34913/1/Lamyetal2014.pdf
https://hdl.handle.net/10013/epic.43047
https://hdl.handle.net/10013/epic.43047.d001
Description
Summary:Dust deposition in the Southern Ocean constitutes a critical modulator of past global climate variability, but how it has varied temporally and geographically is underdetermined. Here, we present data sets of glacial-interglacial dust-supply cycles from the largest Southern Ocean sector, the polar South Pacific, indicating three times higher dust deposition during glacial periods than during interglacials for the past million years. Although the most likely dust source for the South Pacific is Australia and New Zealand, the glacial-interglacial pattern and timing of lithogenic sediment deposition is similar to dust records from Antarctica and the South Atlantic dominated by Patagonian sources. These similarities imply large-scale common climate forcings, such as latitudinal shifts of the southern westerlies and regionally enhanced glaciogenic dust mobilization in New Zealand and Patagonia.

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