Journal
JOURNAL OF CLIMATE
Volume 26, Issue 19, Pages 7570-7585Publisher
AMER METEOROLOGICAL SOC
DOI: 10.1175/JCLI-D-12-00729.1
Keywords
Antarctica; Southern Hemisphere; Tropics; Teleconnections; General circulation models; Trends
Categories
Funding
- U.S. National Science Foundation [OPP-0837988]
- Directorate For Geosciences
- Office of Polar Programs (OPP) [0837988] Funding Source: National Science Foundation
- Office of Polar Programs (OPP)
- Directorate For Geosciences [0944348] Funding Source: National Science Foundation
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Significant summer warming over the eastern Antarctic Peninsula in the last 50 years has been attributed to a strengthening of the circumpolar westerlies, widely believed to be anthropogenic in origin. On the western side of the peninsula, significant warming has occurred mainly in austral winter and has been attributed to the reduction of sea ice. The authors show that austral fall is the only season in which spatially extensive warming has occurred on the Antarctic Peninsula. This is accompanied by a significant reduction of sea ice cover off the west coast. In winter and spring, warming is mainly observed on the west side of the peninsula. The most important large-scale forcing of the significant widespread warming trend in fall is the extratropical Rossby wave train associated with tropical Pacific sea surface temperature anomalies. Winter and spring warming on the western peninsula reflects the persistence of sea ice anomalies arising from the tropically forced atmospheric circulation changes in austral fall.
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