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  1. F300 宇宙地球環境研究所
  2. F300a 雑誌掲載論文
  3. 学術雑誌

Salinity frontogenesis/frontolysis in the northeastern subtropical Pacific region

http://hdl.handle.net/2237/00031495
http://hdl.handle.net/2237/00031495
4a6224df-3496-4cdc-9139-efd56ace3b4f
名前 / ファイル ライセンス アクション
Manuscript_fin.pdf Manuscript_fin (10.0 MB)
Item type 学術雑誌論文 / Journal Article(1)
公開日 2020-02-12
タイトル
タイトル Salinity frontogenesis/frontolysis in the northeastern subtropical Pacific region
言語 en
著者 Ohishi, Shun

× Ohishi, Shun

WEKO 95956

en Ohishi, Shun

Search repository
Katsura, Shota

× Katsura, Shota

WEKO 95957

en Katsura, Shota

Search repository
Aiki, Hidenori

× Aiki, Hidenori

WEKO 95958

en Aiki, Hidenori

Search repository
アクセス権
アクセス権 open access
アクセス権URI http://purl.org/coar/access_right/c_abf2
権利
言語 en
権利情報 “This is a post-peer-review, pre-copyedit version of an article published in [Climate Dynamics]. The final authenticated version is available online at: http://dx.doi.org/10.1007/s00382-019-04907-w”.
抄録
内容記述 Detailed mechanisms of reinforcement/relaxation of a sea surface salinity front, i.e. frontogenesis/frontolysis, in the northeastern subtropical Pacific region are investigated using observational datasets. Throughout the year, meridional shears of zonal wind induce meridional ageostrophic convergence around the front. Saltier water is advected on the southern side than the northern side, and thus the convergence contributes to frontogenesis. The evaporation and precipitation gradients also strengthen the front, because higher sea surface temperatures on the southern side induce stronger evaporation through the formation of higher surface saturated specific humidity, and because the precipitation rate is low in the southern region in association with the subtropical high of the atmosphere. However, in summer–autumn when the mixed layer is seasonally thin and evaporation exceeds precipitation, the frontogenesis by the freshwater flux gradient is damped by the mixed layer depth (MLD) gradient. This is attributed to the thicker mixed layer south of the front being less sensitive to freshwater fluxes. During the mixed-layer deepening phase, the mixed layer on the southern side entrains lower salinity water from the lower layer, and thus the entrainment relaxes the front. Therefore, it is shown that the gradients of ageostrophic advection, evaporation, and precipitation result in frontogenesis, while those of MLD and entrainment cause frontolysis. Furthermore, a metric that quantifies the relative importance of the horizontal gradients of freshwater fluxes and MLD for salinity frontogenesis/frontolysis is proposed. Over the large domain, contribution from the horizontal gradient of freshwater fluxes dominates over that of MLD.
言語 en
内容記述タイプ Abstract
内容記述
内容記述 ファイル公開:2020/11/01
言語 ja
内容記述タイプ Other
出版者
言語 en
出版者 Springer
言語
言語 eng
資源タイプ
資源タイプresource http://purl.org/coar/resource_type/c_6501
タイプ journal article
出版タイプ
出版タイプ AM
出版タイプResource http://purl.org/coar/version/c_ab4af688f83e57aa
DOI
関連タイプ isVersionOf
識別子タイプ DOI
関連識別子 https://doi.org/10.1007/s00382-019-04907-w
ISSN(print)
収録物識別子タイプ PISSN
収録物識別子 0930-7575
書誌情報 en : Climate Dynamics

巻 53, 号 9-10, p. 5927-5943, 発行日 2019-11
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