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Atmospheric winter response to Arctic sea ice changes in reanalysis data and model simulations

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Title: Atmospheric winter response to Arctic sea ice changes in reanalysis data and model simulations
Authors: Jaiser, Ralf Browse this author
Nakamura, Tetsu Browse this author →KAKEN DB
Handorf, Doerthe Browse this author
Dethloff, Klaus Browse this author
Ukita, Jinro Browse this author
Yamazaki, Koji Browse this author
Keywords: polar midlatitude linkages
stratosphere-troposphere coupling
planetary wave activity
Arctic amplification
polar vortex
Issue Date: 17-Jul-2016
Publisher: American Geophysical Union
Journal Title: Journal of geophysical research atmospheres
Volume: 121
Issue: 13
Start Page: 7564
End Page: 7577
Publisher DOI: 10.1002/2015JD024679
Abstract: The changes of atmospheric flow patterns related to Arctic Amplification have impacts well beyond the Arctic regional weather and climate system. Here we examine modulations of vertically propagating planetary waves, a major feature of the climate response to Arctic sea ice reduction by comparing the corresponding results of an atmospheric general circulation model with reanalysis data for periods of high and low sea ice conditions. Under low sea ice condition we find enhanced coupling between troposphere and stratosphere starting in November with preferred polar stratospheric vortex breakdowns in February, which then feeds back to the troposphere. The model experiment and ERA-Interim reanalysis data agree well with respect to temporal and spatial characteristics associated with vertical planetary wave propagation including its precursors. The upward propagating planetary wave anomalies resemble a wave number 1 and 2 pattern depending on region and timing. Since our experimental design only allows influences from sea ice changes and there is a high degree of resemblance between model results and observations, we conclude that sea ice is a main driver of observed winter circulation changes.
Type: article (author version)
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: 山崎 孝治

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