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An interdecadal climate dipole between Northeast Asia and Antarctica over the past five centuries

Journal article
Authors Keyan Fang
Deliang Chen
Zhengtang Guo
Yan Zhao
David Frank
Maosheng He
Feifei Zhou
Feng Shi
Heikki Seppä
Peng Zhang
Raphael Neukom
Published in Climate Dynamics
Volume 52
Issue 1/2
Pages 765–775
ISSN 0930-7575
Publication year 2019
Published at Department of Earth Sciences
Pages 765–775
Language en
Links dx.doi.org/10.1007/s00382-018-4161-...
Keywords Antarctica, Asian summer monsoon, Climate reconstruction, Interdecadal climate change, Northeast Asia
Subject categories Climate Research

Abstract

© 2018 Springer-Verlag GmbH Germany, part of Springer Nature Climate models emphasize the need to investigate inter-hemispheric climatic interactions. However, these models often underestimate the inter-hemispheric differences in climate change. With the wide application of reanalysis data since 1948, we identified a dipole pattern between the geopotential heights (GPHs) in Northeast Asia and Antarctica on the interdecadal scale in boreal summer. This Northeast Asia/Antarctica (NAA) dipole pattern is not conspicuous on the interannual scale, probably in that the interannual inter-hemispheric climate interaction is masked by strong interannual signals in the tropics associated with the El Niño-Southern Oscillation (ENSO). Unfortunately, the instrumental records are not sufficiently long-lasting to detect the interdecadal variability of the NAA. We thus reconstructed GPHs since 1565, making using the proxy records mostly from tree rings in Northeast Asia and ice cores from Antarctica. The strength of the NAA is time-varying and it is most conspicuous in the eighteenth century and after the late twentieth century. The strength of the NAA matches well with the variations of the solar radiation and tends to increase in along with its enhancement. In boreal summer, enhanced heating associated with high solar radiation in the Northern Hemisphere drives more air masses from the South to the North. This inter-hemispheric interaction is particularly strong in East Asia as a result of the Asian summer monsoon. Northeast Asia and Antarctica appear to be the key regions responsible for inter-hemispheric interactions on the interdecadal scale in boreal summer since they are respectively located at the front and the end of this inter-hemispheric trajectory.

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