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Late-glacial elevated dust deposition linked to westerly wind shifts in southern South America

Vanneste, Heleen and De Vleeschouwer, François and Martínez-Cortizas, Antonio and Scheffer, Clemens von and Piotrowska, Natalia and Coronato, Andrea and Le Roux, Gaël Late-glacial elevated dust deposition linked to westerly wind shifts in southern South America. (2015) Scientific Reports, 5. 11670-11680. ISSN 2045-2322

(Document in English)

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Official URL: http://dx.doi.org/10.1038/srep11670


Atmospheric dust loadings play a crucial role in the global climate system. Southern South America is a key dust source, however, dust deposition rates remain poorly quantified since the last glacial termination (~17 kyr ago), an important timeframe to anticipate future climate changes. Here we use isotope and element geochemistry in a peat archive from Tierra del Fuego, to reconstruct atmospheric dust fluxes and associated environmental and westerly wind changes for the past 16.2 kyr. Dust depositions were elevated during the Antarctic Cold Reversal (ACR) and second half of the Younger Dryas (YD) stadial, originating from the glacial Beagle Channel valley. This increase was most probably associated with a strengthening of the westerlies during both periods as dust source areas were already available before the onset of the dust peaks and remained present throughout. Congruent with glacier advances across Patagonia, this dust record indicates an overall strengthening of the wind belt during the ACR. On the other hand, we argue that the YD dust peak is linked to strong and poleward shifted westerlies. The close interplay between dust fluxes and climatic changes demonstrates that atmospheric circulation was essential in generating and sustaining present-day interglacial conditions.

Item Type:Article
Additional Information:Thanks to Nature editor. The definitive version is available at https://www.nature.com/ The original PDF of the article can be found at Scientific Reports website : https://www.nature.com/articles/srep11670
HAL Id:hal-01517029
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Universidad de Santiago de Compostela - USC (SPAIN)
Other partners > Consejo Nacional de Investigaciones Científicas y Técnicas - CONICET (ARGENTINA)
Other partners > Silesian University of Technology (POLAND)
Laboratory name:
Agence National de la Recherche (ANR)
Deposited On:02 May 2017 13:48

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