Roles of shelf slope and wind on upwelling: A case study off east and west coasts of the US
Roles of shelf slope and wind on upwelling: A case study off east and west coasts of the US
复制标题
陆架坡度和风对上升流的作用：美国东西海岸的案例研究
DOI：
10.1016/j.ocemod.2013.06.004
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发表时间：
2013-09
期刊：
影响因子：
3.2
通讯作者：
Jiang, Lide
中科院分区：
文献类型：
--
作者：
Chen, Zhaoyun;Yan, Xiao-Hai;Jiang, Yuwu;Jiang, Lide
To understand the differences in upwelling tendency between the east and west coasts of the U.S., idealized numerical experiments were performed to examine the upwelling response to wind and shelf slope. The primary results show that steeper slope leads to narrower cross-shore width of surface Ekman divergence (WSED) and larger vertical velocity, while stronger upwelling favorable wind stress induces broader WSED and larger vertical velocity. Meanwhile, the wind duration is substantial to determine both the area and intensity of upwelling off the coast. The tendencies for cold upwelling areas off each coast are compared by the upwelling age, which is defined as the ratio of the duration of upwelling favorable wind to the advection time. The advection time, defined as the time scale for cold water to be advected from the pycnocline to the ocean surface, is improved to comprise of climbing time and upwelling time. The latter is related to the upwelling divergence driven by surface Ekman flow. The depth of the switch point of these two processes is approximately 0.9DE(DEis the Ekman depth). The proposed formula for the advection time is found to be consistent with estimates derived from the use of particle trajectory analysis within the numerical model results. The consideration of upwelling age shows that differences in wind forcing are more important than bottom slope in accounting for the different characteristics of upwelling areas off the California and New Jersey coasts.
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DOI：
10.1196/annals.1446.004
发表时间：
2008-01-01
期刊：
TRENDS AND DIRECTIONS IN CLIMATE RESEARCH
影响因子：
--
作者：
Gomez-Gesteira, M.;de Castro, M.;Crespo, A. J. C.
通讯作者：
Crespo, A. J. C.
影响因子：
0.5
作者：
Estrade Philippe;Marchesiello Patrick;De Verdière Alain Colin;Roy Claude
通讯作者：
Estrade Philippe;Marchesiello Patrick;De Verdière Alain Colin;Roy Claude
影响因子：
5.2
作者：
A. Souza;L. G. Alvarez;T. Dickey
通讯作者：
A. Souza;L. G. Alvarez;T. Dickey
影响因子：
2.3
作者：
Lide Jiang;L. Breaker;Xiao‐Hai Yan
通讯作者：
Lide Jiang;L. Breaker;Xiao‐Hai Yan
影响因子：
3.2
作者：
Shchepetkin, AF;McWilliams, JC
通讯作者：
McWilliams, JC