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Vanneste H, De Vleeschouwer F, Martínez-Cortizas A, et al. Late-glacial elevated dust deposition linked to westerly wind shifts in southern South America. Sci Rep. 2015;5:11670doi: 10.1038/srep11670.
Vanneste, H., De Vleeschouwer, F., Martínez-Cortizas, A., von Scheffer, C., Piotrowska, N., Coronato, A., & Le Roux, G. (2015). Late-glacial elevated dust deposition linked to westerly wind shifts in southern South America. Scientific reports, 511670. https://doi.org/10.1038/srep11670
Vanneste, Heleen, et al. "Late-glacial elevated dust deposition linked to westerly wind shifts in southern South America." Scientific reports vol. 5 (2015): 11670. doi: https://doi.org/10.1038/srep11670
Vanneste H, De Vleeschouwer F, Martínez-Cortizas A, von Scheffer C, Piotrowska N, Coronato A, Le Roux G. Late-glacial elevated dust deposition linked to westerly wind shifts in southern South America. Sci Rep. 2015 Jul 01;5:11670. doi: 10.1038/srep11670. PMID: 26126739; PMCID: PMC4486931.
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Sci Rep. 2015 Jul 01;5:11670. doi: 10.1038/srep11670.

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

Scientific reports

Heleen Vanneste, François De Vleeschouwer, Antonio Martínez-Cortizas, Clemens von Scheffer, Natalia Piotrowska, Andrea Coronato, Gaël Le Roux

Affiliations

  1. 1] Université de Toulouse, INP, UPS, EcoLab (Laboratoire Ecologie Fonctionnelle et Environnement), ENSAT, Avenue de l'Agrobiopole, 31326 Castanet Tolosan, France [2] CNRS, EcoLab, 31326 Castanet Tolosan, France.
  2. Departamento de Edafología y Química Agrícola, Facultad de Biología, Universidad de Santiago de Compostela, Campus Sur E-15706, Santiago de Compostela, Spain.
  3. Université de Toulouse, INP, UPS, EcoLab (Laboratoire Ecologie Fonctionnelle et Environnement), ENSAT, Avenue de l'Agrobiopole, 31326 Castanet Tolosan, France.
  4. Department of Radioisotopes, Institute of Physics, Silesian University of Technology, Gliwice, Poland.
  5. CONICET-CADIC, B. Houssay 200, 9410 Ushuaia, Tierra del Fuego, Argentina.

PMID: 26126739 PMCID: PMC4486931 DOI: 10.1038/srep11670

Abstract

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.

References

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