Future circulation changes off West Antarctica: Sensitivity of the Amundsen Sea Low to projected anthropogenic forcing

Hosking, J. Scott ORCID: https://orcid.org/0000-0002-3646-3504; Orr, Andrew ORCID: https://orcid.org/0000-0001-5111-8402; Bracegirdle, Thomas J. ORCID: https://orcid.org/0000-0002-8868-4739; Turner, John ORCID: https://orcid.org/0000-0002-6111-5122. 2016 Future circulation changes off West Antarctica: Sensitivity of the Amundsen Sea Low to projected anthropogenic forcing. Geophysical Research Letters, 43 (1). 367-376. https://doi.org/10.1002/2015GL067143

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Abstract/Summary

The Amundsen Sea Low (ASL) is a major driver of West Antarctic climate variability, with the potential to accelerate the loss of glacial ice. Using the 11 global climate models which most reliably simulate the seasonality in ASL location, we assess the ASL sensitivity to projected future changes using the CMIP5 historical (1951–2000) and representative concentration pathway experiment RCP8.5 (2051–2100). For the first time, we show that the future ASL will likely migrate poleward in summer (December, January, and February) and autumn (March, April, and May), and eastward in autumn and winter (June, July, and August). The autumn-winter changes drive colder southerly winds over the Ross Sea and warmer northerly winds toward the Antarctic Peninsula. This is consistent with recent trends in ERA-Interim reanalysis meridional winds (1979–2014) and reconstructed temperature (1957–2006), suggesting that the impact of anthropogenic forcing on the ASL is likely to play an important role on both past and future patterns of West Antarctic climate variability.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1002/2015GL067143
Programmes:	BAS Programmes > BAS Programmes 2015 > Atmosphere, Ice and Climate
ISSN:	0094-8276
Additional Keywords:	West Antarctica, CMIP5, Amundsen Sea Low, surface climate, greenhouse gases, temperature trends
Date made live:	25 Jan 2016 15:17 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/511614

Item Type:

Publication - Article

Digital Object Identifier (DOI):

https://doi.org/10.1002/2015GL067143

Programmes:

BAS Programmes > BAS Programmes 2015 > Atmosphere, Ice and Climate

ISSN:

0094-8276

Additional Keywords:

West Antarctica, CMIP5, Amundsen Sea Low, surface climate, greenhouse gases, temperature trends

Date made live:

25 Jan 2016 15:17 +0 (UTC)