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The stratospheric pathway for Arctic impacts on midlatitude climate

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Title: The stratospheric pathway for Arctic impacts on midlatitude climate
Authors: Nakamura, Tetsu Browse this author
Yamazaki, Koji Browse this author →KAKEN DB
Iwamoto, Katsushi Browse this author
Honda, Meiji Browse this author
Miyoshi, Yasunobu Browse this author →KAKEN DB
Ogawa, Yasunobu Browse this author →KAKEN DB
Tomikawa, Yoshihiro Browse this author →KAKEN DB
Ukita, Jinro Browse this author
Issue Date: 2-Apr-2016
Publisher: AGU
Journal Title: Geophysical Research Letters
Volume: 43
Issue: 7
Start Page: 3494
End Page: 3501
Publisher DOI: 10.1002/2016GL068330
Abstract: Recent evidence from both observations and model simulations suggests that an Arctic sea ice reduction tends to cause a negative Arctic Oscillation (AO) phase with severe winter weather in the Northern Hemisphere, which is often preceded by weakening of the stratospheric polar vortex. Although this evidence hints at a stratospheric involvement in the Arctic-midlatitude climate linkage, the exact role of the stratosphere remains elusive. Here we show that tropospheric AO response to the Arctic sea ice reduction largely disappears when suppressing the stratospheric wave mean flow interactions in numerical experiments. The results confirm a crucial role of the stratosphere in the sea ice impacts on the midlatitudes by coupling between the stratospheric polar vortex and planetary-scale waves. Those results and consistency with observation-based evidence suggest that a recent Arctic sea ice loss is linked to midlatitudes extreme weather events associated with the negative AO phase.
Rights: An edited version of this paper was published by AGU. Copyright (year) American Geophysical Union.
Type: article
Appears in Collections:環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 中村 哲

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