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Winter climate change on the northern and southern Antarctic Peninsula

Published online by Cambridge University Press:  27 May 2020

Oleksandr M. Evtushevsky*
Affiliation:
Space Physics Laboratory, Taras Shevchenko National University of Kyiv, 64/13 Volodymyrska Street, 01601Kyiv, Ukraine
Volodymyr O. Kravchenko
Affiliation:
Space Physics Laboratory, Taras Shevchenko National University of Kyiv, 64/13 Volodymyrska Street, 01601Kyiv, Ukraine
Asen V. Grytsai
Affiliation:
Astronomy and Space Physics Department, Taras Shevchenko National University of Kyiv, 64/13 Volodymyrska Street, 01601Kyiv, Ukraine
Gennadi P. Milinevsky
Affiliation:
Space Physics Laboratory, Taras Shevchenko National University of Kyiv, 64/13 Volodymyrska Street, 01601Kyiv, Ukraine International Center of Future Science, Jilin University, 2699 Qianjin Street, 130012Changchun, China Department of Atmosphere Physics, National Antarctic Scientific Center, 16 Taras Shevchenko Boulevard, 01601Kyiv, Ukraine

Abstract

Differences in the decadal trend in the winter surface temperature in the northern and southern Antarctic Peninsula have been analysed. Time series from the two stations Esperanza and Faraday/Vernadsky since the early 1950s are used. The two time series are strongly correlated only during the 1980s and 1990s when their variability and trends are associated with both the Niño-4 region and Southern Annular Mode impacts. The winter cooling at the Faraday/Vernadsky station contrasts with the winter warming at the Esperanza station during the period of 2006–17. The different temperature trends are accompanied by weak correlations between the temperatures at these two stations. Linearly congruent components of the station temperature trends in 2006–17 indicate a dominant contribution of Southern Annular Mode (tropical sea surface temperature anomalies) to warming (cooling) in the northern (southern) Peninsula. Distinctive impacts of climate modes are observed in combination with the recent deepening of the negative sea-level pressure anomaly to the west of the peninsula and the related change in the zonal and meridional wind components. These factors apparently contribute to the occurrence of the boundary that crosses the peninsula and divides it into sub-regions with warming and cooling.

Type
Physical Sciences
Copyright
Copyright © Antarctic Science Ltd 2020

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