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Summer Arctic Atmospheric Circulation Response to Spring Eurasian Snow Cover and Its Possible Linkage to Accelerated Sea Ice Decrease
https://nied-repo.bosai.go.jp/records/6057
https://nied-repo.bosai.go.jp/records/6057fd7fdf48-46c6-4670-9fb0-073f38700d3a
Item type | researchmap(1) | |||||||||||
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公開日 | 2023-04-27 | |||||||||||
タイトル | ||||||||||||
言語 | en | |||||||||||
タイトル | Summer Arctic Atmospheric Circulation Response to Spring Eurasian Snow Cover and Its Possible Linkage to Accelerated Sea Ice Decrease | |||||||||||
著者 |
Shinji Matsumura
× Shinji Matsumura
× Xiangdong Zhang
× Koji Yamazaki
|
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抄録 | ||||||||||||
内容記述タイプ | Other | |||||||||||
内容記述 | Abstract Anticyclonic circulation has intensified over the Arctic Ocean in summer during recent decades. However, the underlying mechanism is, as yet, not well understood. Here, it is shown that earlier spring Eurasian snowmelt leads to anomalously negative sea level pressure (SLP) over Eurasia and positive SLP over the Arctic, which has strong projection on the negative phase of the northern annular mode (NAM) in summer through the wave–mean flow interaction. Specifically, earlier spring snowmelt over Eurasia leads to a warmer land surface, because of reduced surface albedo. The warmed surface amplifies stationary Rossby waves, leading to a deceleration of the subpolar jet. As a consequence, rising motion is enhanced over the land, and compensating subsidence and adiabatic heating occur in the Arctic troposphere, forming the negative NAM. The intensified anticyclonic circulation has played a contributing role in accelerating the sea ice decline observed during the last two decades. The results here provide important information for improving seasonal prediction of summer sea ice cover. |
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言語 | en | |||||||||||
書誌情報 |
en : Journal of Climate 巻 27, 号 17, p. 6551-6558, 発行日 2014-08-28 |
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出版者 | ||||||||||||
言語 | en | |||||||||||
出版者 | American Meteorological Society | |||||||||||
ISSN | ||||||||||||
収録物識別子タイプ | EISSN | |||||||||||
収録物識別子 | 1520-0442 | |||||||||||
DOI | ||||||||||||
関連識別子 | 10.1175/jcli-d-13-00549.1 |