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

• Main Authors: Fang, Keyan, Chen, Deliang, Guo, Zhengtang, Zhao, Yan, Frank, David, He, Maosheng, Zhou, Feifei, Shi, Feng, Seppä, Heikki, Zhang, Peng, Neukom, Raphael
• Format: Text
• Language: English
• Published: Springer 2019
• Subjects: 550 Earth sciences & geology; 910 Geography & travel; Antarc*; Antarctica
• Online Access: https://dx.doi.org/10.7892/boris.113572; https://boris.unibe.ch/113572/

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 longlasting 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 ...