Journal article

An ice-core proxy for northerly air mass incursions into West Antarctica

Daniel A Dixon, Paul A Mayewski, Ian D Goodwin, Gareth J Marshall, Rhaelene Freeman, Kirk A Maasch, Sharon B Sneed

International Journal of Climatology | WILEY-BLACKWELL | Published : 2012

Abstract

A 200-year proxy for northerly air mass incursions (NAMI) into central and western West Antarctica is developed from the examination of 19 shallow (21-150 m deep) Antarctic ice-core non-sea-salt (nss) Ca 2+ concentration records. The NAMI proxy reveals a significant rise in recent decades. This rise is unprecedented for at least the past 200 years and is coincident with anthropogenically driven changes in other large-scale Southern Hemisphere (SH) environmental phenomena such as greenhouse gas (GHG) induced warming, ozone depletion, and the associated intensification of the SH westerlies. The Hysplit trajectory model is used to examine air mass transport pathways into West Antarctica. Empiri..

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Grants

Awarded by US National Science Foundation Office of Polar Programs


Awarded by Natural Environment Research Council


Awarded by Directorate For Geosciences


Funding Acknowledgements

This research was supported by the US National Science Foundation Office of Polar Programs grants (0096305, 0096299, 0439589, 063740, 063650 and 0837883) and the W.M. Keck Foundation to P. M. We thank the US Antarctic Program, the 109th N.Y. Air National Guard, Ice Core Drilling Services, Raytheon Polar Services Company and our US ITASE field colleagues for their support.