References

ACPD

Atmospheric Chemistry and Physics Discussions

ACPD

1680-7375

Copernicus GmbH

Göttingen, Germany

10.5194/acpd-12-12685-2012

Mineral dust variability in central West Antarctica associated with ozone depletion

Cataldo

¹ Evangelista

¹ Simões

J. C.

² Godoi

R. H. M.

³ Simmonds

⁴ Hollanda

M. H.

⁵ Wainer

⁶ Aquino

F. E.

² van Grieken

⁷

LARAMG, Universidade do Estado do Rio de Janeiro (Uerj), Pav. Haroldo L. Cunha/Subsolo, Rua São Francisco Xavier 524, Maracanã, 20550-013 Rio de Janeiro, RJ, Brazil

Centro Polar e Climático, Instituto de Geociências, UFRGS, Av. Bento Goncalves 9500, Postal Code 91501-970, Porto Alegre, RS, Brazil

Environmental Engineering Department, Federal University of Paraná (UFPR), Postal Code 19011, 81531-990, Curitiba, PR, Brazil

School of Earth Sciences, University of Melbourne, 3010, Victoria, Australia

Instituto de Geociências, Universidade de São Paulo (USP), Rua do Lago 562, 05508-080, São Paulo, SP, Brazil

Departamento de Oceanografia Física, IO, Universidade de São Paulo USP, Praça do Oceanográfico 191, 05508-120, São Paulo, SP, Brazil

Micro and Trace Analysis Centre, Department of Chemistry, University of Antwerp, 2610, Antwerp, Belgium

21 05 2012

12 5 12685 12714

This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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The full text article is available as a PDF file from http://www.atmos-chem-phys-discuss.net/12/12685/2012/acpd-12-12685-2012.pdf

Here we show that mineral dust retrieved from an ice core in the central West Antarctic sector, spanning the last five decades, provides evidence that northerly air mass incursions into Antarctica, tracked by dust microparticles, have slightly declined. This result contrasts with dust in ice core records reported in West/coastal Antarctica, which show significant increases to the present day. We attribute that difference, in part, to changes in the regional climate regime triggered by the ozone depletion and its consequences for the polar vortex intensity. The vortex maintains the Antarctic central region relatively isolated from mid-latitude air mass incursions with implications to the intensification of the Westerlies and to a persistent positive phase of the Southern Annular Mode. We also show that variability of the diameter of insoluble microparticles in central West Antarctica can be modeled by linear/quadratic functions of both cyclone depth (energy) and wind intensity around Antarctica.

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