气候变化领域集成服务门户(CCPortal): Seasonal Upper Shelf Circulation Along the Central Western Gulf of Mexico: A Preferential Upcoast Flow Reinforced by the Recurrent Arrival of Loop Current Eddies

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DOI	10.1029/2019JC015596
	Seasonal Upper Shelf Circulation Along the Central Western Gulf of Mexico: A Preferential Upcoast Flow Reinforced by the Recurrent Arrival of Loop Current Eddies
	Gómez-Valdivia F.; Parés-Sierra A.
发表日期	2020
ISSN	21699275
卷号	125 期号:1
英文摘要	The shelf circulation along the central western Gulf of Mexico has been traditionally attributed to a local alongshore wind stress component (AWSC) that heads upcoast during spring-summer and turns downcoast to reach long-term monthly averages larger than ∼0.05 Pa during fall-winter. Modern wind databases exhibit, however, a local seasonal downcoast AWSC more than 10 times weaker. A realistic numerical model implementation revealed that the effect of the downcoast AWSC is recurrently overwhelmed by the upcoast geostrophic shelf circulation induced by the anticyclonic Loop Current Eddies arrival. Sporadic energetic downcoast shelf flows were generated by erratic cyclonic eddies next to the shelf and by the propagation of coastally trapped waves; nonetheless, the upcoast AWSC and the recurrent presence of Loop Current Eddies induced a preferential upcoast shelf circulation throughout the year. The upcoast shelf flow reached long-term bimonthly averages up to (∼50 cm/s during spring and summer. Although weaker, the shelf current remained preferentially upcoast during fall and winter with long-term bimonthly averages less than ∼10 cm/s. The long-term seasonal variability of the reproduced shelf dynamics represented the long-term annual cycle of the directly observed local shelf circulation. Direct observations and a second numerical experiment revealed that the previously reported seasonal alongshore inversion of the central western Gulf of Mexico shelf circulation, with downcoast flows that reach long-term monthly averages larger than ∼40 cm/s, can be attributed to both an exaggerated wind forcing during fall-winter and an inadequate representation of the local mesoscale dynamics. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Gulf of Mexico; local wind; Loop Current Eddies; seasonal variability; shelf circulation
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187026
作者单位	Departamento de Oceanografía Física, Centro de Investigación Científica y de Educación Superior de Ensenada, Ensenada, Mexico
推荐引用方式 GB/T 7714	Gómez-Valdivia F.,Parés-Sierra A.. Seasonal Upper Shelf Circulation Along the Central Western Gulf of Mexico: A Preferential Upcoast Flow Reinforced by the Recurrent Arrival of Loop Current Eddies[J],2020,125(1).
APA	Gómez-Valdivia F.,&Parés-Sierra A..(2020).Seasonal Upper Shelf Circulation Along the Central Western Gulf of Mexico: A Preferential Upcoast Flow Reinforced by the Recurrent Arrival of Loop Current Eddies.Journal of Geophysical Research: Oceans,125(1).
MLA	Gómez-Valdivia F.,et al."Seasonal Upper Shelf Circulation Along the Central Western Gulf of Mexico: A Preferential Upcoast Flow Reinforced by the Recurrent Arrival of Loop Current Eddies".Journal of Geophysical Research: Oceans 125.1(2020).