2016年10月
On the atmospheric response experiment to a Blue Arctic Ocean
GEOPHYSICAL RESEARCH LETTERS
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- 巻
- 43
- 号
- 19
- 開始ページ
- 10394
- 終了ページ
- 10402
- 記述言語
- 英語
- 掲載種別
- DOI
- 10.1002/2016GL070526
- 出版者・発行元
- AMER GEOPHYSICAL UNION
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.
- リンク情報
- ID情報
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- DOI : 10.1002/2016GL070526
- ISSN : 0094-8276
- eISSN : 1944-8007
- Web of Science ID : WOS:000386939800010