气候变化领域集成服务门户(CCPortal): Observations and Modeling of Ocean Circulation in the Seychelles Plateau Region

CCPortal

DOI	10.1029/2020JC016593
	Observations and Modeling of Ocean Circulation in the Seychelles Plateau Region
	Castillo-Trujillo A.C.; Arzeno-Soltero I.B.; Giddings S.N.; Pawlak G.; McClean J.; Rainville L.
发表日期	2021
ISSN	21699275
卷号	126 期号:2
英文摘要	The ocean circulation around and over the Seychelles Plateau (SP) is characterized using 35 months of temperature and velocity measurements along with a numerical model. The results here provide the first documented description of the ocean circulation atop the SP. The SP is an unusually broad (∼200 km), shallow (∼50 m) plateau, dropping off steeply to the abyss. It is situated in a dynamic location (3.5–5.5°S, 54-57°E) in the south-western tropical Indian Ocean where northwesterly winds are present during austral summer and become southeasterly in austral winter, following the reversal of the western Indian ocean monsoon winds. Measurements around the Inner Islands, on the SP, have been carried out since 2015. Velocity measurements show that most of the depth-averaged current variance on the SP arises from near-inertial oscillations and lower-frequency variability. Lower-frequency variability encompasses seasonal and intraseasonal variability, the latter of which includes the effects of mixed Rossby-gravity waves and mesoscale eddies. A global 0.1° numerical ocean simulation is used in conjunction with these observations to describe the regional circulation around the SP. Atop the SP, circulation is dominated by ageostrophic processes consistent with Ekman dynamics, while around the SP, both geostrophic and ageostrophic processes are important and vary seasonally. Stratification responds to the sea surface height semiannual signal which is due to Ekman pumping-driven upwelling (related to the Seychelles-Chagos Thermocline Ridge) and the arrival of an annual downwelling Rossby wave. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	mixed Rossby-gravity waves; monsoons; ocean circulation \| Seychelles Plateau; Southern Tropical Indian Ocean
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/186452
作者单位	Scripps Institution of Oceanography, University of California, San Diego, CA, United States; Department of Mechanical and Aerospace Engineering, University of California, San Diego, CA, United States; Applied Physics Laboratory, University of Washington, Seattle, WA, United States
推荐引用方式 GB/T 7714	Castillo-Trujillo A.C.,Arzeno-Soltero I.B.,Giddings S.N.,et al. Observations and Modeling of Ocean Circulation in the Seychelles Plateau Region[J],2021,126(2).
APA	Castillo-Trujillo A.C.,Arzeno-Soltero I.B.,Giddings S.N.,Pawlak G.,McClean J.,&Rainville L..(2021).Observations and Modeling of Ocean Circulation in the Seychelles Plateau Region.Journal of Geophysical Research: Oceans,126(2).
MLA	Castillo-Trujillo A.C.,et al."Observations and Modeling of Ocean Circulation in the Seychelles Plateau Region".Journal of Geophysical Research: Oceans 126.2(2021).