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Antarctic temperature variability and change from station data

Turner, John ORCID: https://orcid.org/0000-0002-6111-5122; Marshall, Gareth ORCID: https://orcid.org/0000-0001-8887-7314; Clem, Kyle; Colwell, Steve; Phillips, Tony ORCID: https://orcid.org/0000-0002-3058-9157; Lu, Hua ORCID: https://orcid.org/0000-0001-9485-5082. 2019 Antarctic temperature variability and change from station data. International Journal of Climatology. https://doi.org/10.1002/joc.6378

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This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. © 2019 The Authors. International Journal of Climatology published by John Wiley & Sons Ltd on behalf of the Royal Meteorological Society
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Abstract/Summary

Variability and change in near‐surface air temperature at 17 Antarctic stations is examined using data from the SCAR READER database. We consider the relationships between temperature, and atmospheric circulation, sea ice concentration and forcing by the tropical oceans. All 17 stations have their largest inter‐annual temperature variability during the winter and the annual mean temperature anomalies are dominated by winter temperatures. The large inter‐annual temperature variability on the western Antarctic Peninsula has decreased over the instrumental period as sea ice has declined. Variability in the phase of the SAM exerts the greatest control of temperatures, although tropical Pacific forcing has also played a large part, along with local atmospheric circulation variability at some locations. The relationship of positive (negative) SAM and high (low) Peninsula and low (high) East Antarctic temperatures was not present before the mid‐1970s. Thirteen of the 17 stations have experienced a positive trend in their annual mean temperature over the full length of their record, with the largest being at Vernadsky (formerly Faraday) (0.46° ± 0.15 C dec−1) on the western side of the Antarctic Peninsula. The deepening of the Amundsen Sea Low as a result of the more positive SAM and changes in the IPO and PDO have contributed to the warming of the Peninsula. Beyond the Antarctic Peninsula there has been little significant change in temperature. The two plateau stations had a small cooling from the late 1970s to the late 1990s consistent with the SAM becoming positive, but have subsequently warmed. During spring there has been an Antarctic‐wide warming, with all but one station having experienced an increase in temperature, although the only trends that were significant were at Vostok, Scott base, Vernadsky and Amundsen‐Scott. In this season much of the Peninsula/West Antarctic warming can be attributed to tropical Pacific forcing through the IPO/PDO.

Item Type: Publication - Article
Digital Object Identifier (DOI): https://doi.org/10.1002/joc.6378
ISSN: 0899-8418
Additional Keywords: Antarctica, climate change, climate variability, temperature
Date made live: 04 Nov 2019 09:58 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/523672

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