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https://hdl.handle.net/20.500.14094/90005463
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2024-04-23
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90005463 (fulltext)
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5.63 MB
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メタデータID
90005463
アクセス権
open access
出版タイプ
Version of Record
タイトル
Submesoscale Coherent Structures on the Continental Shelf
著者
Dauhajre, Daniel P. ; McWilliams, James C. ; Uchiyama, Yusuke
著者名
Dauhajre, Daniel P.
著者名
McWilliams, James C.
著者ID
A0968
研究者ID
1000080344315
KUID
https://kuid-rm-web.ofc.kobe-u.ac.jp/search/detail?systemId=321466d484cf497c520e17560c007669
著者名
Uchiyama, Yusuke
内山, 雄介
ウチヤマ, ユウスケ
所属機関名
工学研究科
収録物名
Journal of Physical Oceanography
巻(号)
47(12)
ページ
2949-2976
出版者
AMS(American Meteorological Society)
刊行日
2017-12
公開日
2018-12-18
抄録
Discovery and analysis of submesoscale variability O(0.3–30) km on the continental shelf is made possible by a high-resolution (Δx = 75 m) Regional Oceanic Modeling System (ROMS) simulation of the Southern California Bight (SCB). This variability is manifest in ubiquitous yet ephemeral coherent structures: fronts, filaments, and vortices. Similar to their open-ocean counterparts, fronts and filaments on the shelf are identified by their strong vertical velocity, surface convergence, cyclonic vorticity, and horizontal density gradient. Life cycles of these features typically last 3–5 days, with the formation dominated by a horizontal advective tendency that increases density and velocity gradients (i.e., frontogenesis). The shape of the coastline and depth of the water column both influence the abundance and spatial orientation of shallow-water fronts and filaments. Closer to shore, fronts and filaments often align themselves parallel to isobaths, and headlands often act as sites of intense vorticity generation through bottom stress. A quasi-steady, approximate momentum balance among rotation, pressure gradient, and vertical mixing—known as turbulent thermal wind (TTW)—often is valid in the strong secondary circulations local to fronts and filaments. However, front and filament circulations subject to strong diurnal variation in surface heating and vertical mixing are inconsistent with steady-state TTW balance. The secondary circulations can induce ephemeral material trapping and substantial vertical heat fluxes on the shelf.
キーワード
Continental shelf/slope
Coastal flows
Fronts
Regional models
Diurnal effects
Oceanic variability
カテゴリ
工学研究科
学術雑誌論文
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資源タイプ
journal article
言語
English (英語)
ISSN
0022-3670
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eISSN
1520-0485
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NCID
AA00704803
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関連情報
DOI
https://doi.org/10.1175/JPO-D-16-0270.1
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