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

Springer Science and Business Media LLC - Tập 52 - Trang 765-775 - 2018
Keyan Fang1,2,3, Deliang Chen2, Zhengtang Guo3,4,5, Yan Zhao6, David Frank7, Maosheng He8, Feifei Zhou1, Feng Shi3, Heikki Seppä9, Peng Zhang2, Raphael Neukom10
1Key Laboratory of Humid Subtropical Eco-geographical Process, Ministry of Education, Fujian Normal University, Fuzhou, China
2Regional Climate Group, Department of Earth Sciences, University of Gothenburg, Gothenburg, Sweden
3Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China
4University of Chinese Academy of Sciences, Beijing, China
5CAS Center for Excellence in Tibetan Plateau Earth Sciences (CETES), Beijing, China
6Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China
7Laboratory of Tree-Ring Research, University of Arizona, Tucson, USA
8Leibniz Institute of Atmospheric Physics, Kühlungsborn, Germany
9Department of Geosciences and Geography, University of Helsinki, Helsinki, Finland
10Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland

Tóm tắt

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.

Tài liệu tham khảo

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