Foehn winds link climate-driven warming to ice shelf evolution in Antarctica Cape, Mattias R. Vernet, Maria Skvarca, Pedro Marinsek, Sebastian Scambos, Ted Domack, Eugene 2016-02-04T20:49:52Z 2016-05-03T07:27:01Z 2015-11-03
dc.description Author Posting. © American Geophysical Union, 2015. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Atmospheres 120 (2015): 11,037–11,057, doi:10.1002/2015JD023465. en_US
dc.description.abstract Rapid warming of the Antarctic Peninsula over the past several decades has led to extensive surface melting on its eastern side, and the disintegration of the Prince Gustav, Larsen A, and Larsen B ice shelves. The warming trend has been attributed to strengthening of circumpolar westerlies resulting from a positive trend in the Southern Annular Mode (SAM), which is thought to promote more frequent warm, dry, downsloping foehn winds along the lee, or eastern side, of the peninsula. We examined variability in foehn frequency and its relationship to temperature and patterns of synoptic-scale circulation using a multidecadal meteorological record from the Argentine station Matienzo, located between the Larsen A and B embayments. This record was further augmented with a network of six weather stations installed under the U.S. NSF LARsen Ice Shelf System, Antarctica, project. Significant warming was observed in all seasons at Matienzo, with the largest seasonal increase occurring in austral winter (+3.71°C between 1962–1972 and 1999–2010). Frequency and duration of foehn events were found to strongly influence regional temperature variability over hourly to seasonal time scales. Surface temperature and foehn winds were also sensitive to climate variability, with both variables exhibiting strong, positive correlations with the SAM index. Concomitant positive trends in foehn frequency, temperature, and SAM are present during austral summer, with sustained foehn events consistently associated with surface melting across the ice sheet and ice shelves. These observations support the notion that increased foehn frequency played a critical role in precipitating the collapse of the Larsen B ice shelf. en_US
dc.description.embargo 2016-05-03 en_US
dc.description.sponsorship National Science Foundation Office of Polar Programs Grant Numbers: ANT-0732983, ANT-0732467, ANT-0732921; NSF Graduate Research Fellowship Grant Number: DGE-1144086; NASA Earth and Space Science Fellowship Program Grant Number: NNX12AN48H en_US
dc.identifier.citation Journal of Geophysical Research: Atmospheres 120 (2015): 11,037–11,057 en_US
dc.identifier.doi 10.1002/2015JD023465
dc.language.iso en_US en_US
dc.publisher John Wiley & Sons en_US
dc.subject Foehn en_US
dc.subject Föhn en_US
dc.subject Larsen Ice Shelf en_US
dc.subject Antarctica en_US
dc.subject Climate en_US
dc.subject Southern Annular Mode en_US
dc.title Foehn winds link climate-driven warming to ice shelf evolution in Antarctica en_US
dc.type Article en_US
dspace.entity.type Publication
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