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On the atmospheric response experiment to a Blue Arctic Ocean

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Title: On the atmospheric response experiment to a Blue Arctic Ocean
Authors: Nakamura, Tetsu Browse this author
Yamazaki, Koji Browse this author →KAKEN DB
Honda, Meiji Browse this author
Ukita, Jinro Browse this author →KAKEN DB
Jaiser, Ralf Browse this author
Handorf, Doerthe Browse this author
Dethloff, Klaus Browse this author
Keywords: Arctic sea ice reduction
Arctic Oscillation
extreme weather
polar amplification
stratosphere-troposphere coupling
Issue Date: Oct-2016
Publisher: American Geophysical Union
Journal Title: Geophysical research letters
Volume: 43
Issue: 19
Start Page: 10394
End Page: 10402
Publisher DOI: 10.1002/2016GL070526
Abstract: We demonstrated atmospheric responses to a reduction in Arctic sea ice via simulations in which Arctic sea ice decreased stepwise from the present-day range to an ice-free range. In all cases, the tropospheric response exhibited a negative Arctic Oscillation (AO)-like pattern. An intensification of the climatological planetary-scale wave due to the present-day sea ice reduction on the Atlantic side of the Arctic Ocean induced stratospheric polar vortex weakening and the subsequent negative AO. Conversely, strong Arctic warming due to ice-free conditions across the entire Arctic Ocean induced a weakening of the tropospheric westerlies corresponding to a negative AO without troposphere-stratosphere coupling, for which the planetary-scale wave response to a surface heat source extending to the Pacific side of the Arctic Ocean was responsible. Because the resultant negative AO-like response was accompanied by secondary circulation in the meridional plane, atmospheric heat transport into the Arctic increased, accelerating the Arctic amplification.
Rights: An edited version of this paper was published by AGU. Copyright 2016 American Geophysical Union.Tetsu Nakamura , Koji Yamazaki, Meiji Honda, Jinro Ukita, Ralf Jaiser, Dörthe Handorf,and Klaus Dethloff, (2016), On the atmospheric response experiment to a Blue Arctic Ocean, Geophygical Research Letters, 43, 10394-10402, doi:10.1002/ 2016GL07052. To view the published open abstract, go to and enter the DOI.
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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