气候变化领域集成服务门户(CCPortal): Surface Thermal Structure and Variability of Upwelling Shadows in the Gulf of Arauco, Chile

CCPortal

DOI	10.1029/2020JC016194
	Surface Thermal Structure and Variability of Upwelling Shadows in the Gulf of Arauco, Chile
	Wong Z.; Saldías G.S.; Largier J.L.; Strub P.T.; Sobarzo M.
发表日期	2021
ISSN	21699275
卷号	126 期号:4
英文摘要	The upwelling shadow in the Gulf of Arauco (GA) is studied using 15 years of daily satellite images of Sea Surface Temperature (SST) from Geostationary Operational Environmental Satellites (GOES), as well as heat flux and wind data from the ERA5 reanalysis product. An Upwelling Shadow Index (USI) is developed based on the SST differences between the GA and the region off Punta Lavapie (PL) farther offshore, characterized by active upwelling. USI values greater than 0.91°C and SST differences less than 1.1°C, correspond to an upwelling shadow event. These cases occurred 10.29% of the time and were more frequent in spring/summer during events of upwelling-favorable winds with strong cyclonic wind stress curl, interspersed with wind relaxations. Multiple correlations between USI and wind stress curl and solar radiation showed an r2 = 40%–80% for some summer months. Most events persisted for only 1 day (53%), whereas 34% of upwelling shadow events lasted between 2 and 4 days and 9% of events were longer than 4 days. Water residence times as long as 15 days were observed in the GA during upwelling shadow events. During southerly wind relaxation (less than 2 days), cold surface waters flowing north from PL curved onshore and entered the GA from the north, weakening the thermal gradient between PL and GA and the upwelling shadow. Long periods of wind relaxation (at least 1 week) resulted in the dissipation of the thermal gradient due to the warming of offshore waters. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	Gulf of Arauco; Sea surface temperature; Upwelling front; Upwelling shadows; Wind stress curl
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/186373
作者单位	Graduate Program in Oceanography, Department of Oceanography, Faculty of Natural Sciences and Oceanography, University of Concepción, Concepción, Chile; Ecosystem Studies Program in the Gulf of Arauco (PREGA), University of Concepción, Concepción, Chile; Departamento de Física, Facultad de Ciencias, Universidad del Bío-Bío, Concepción, Chile; Centro FONDAP de Investigación en Dinámica de Ecosistemas Marinos de Altas Latitudes (IDEAL), Valdivia, Chile; Coastal & Marine Sciences Institute, University of California Davis, Bodega Bay, CA, United States; Department of Environmental Science & Policy, University of California Davis, Davis, CA, United States; College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR, United States; Department of Oceanography, Faculty of Natural Sciences and Oceanography, University of Concepción, Concepción, Chile; Interdisciplinary Center for Aquaculture Research (INCAR), University of Concepción, Concepción, Chile
推荐引用方式 GB/T 7714	Wong Z.,Saldías G.S.,Largier J.L.,et al. Surface Thermal Structure and Variability of Upwelling Shadows in the Gulf of Arauco, Chile[J],2021,126(4).
APA	Wong Z.,Saldías G.S.,Largier J.L.,Strub P.T.,&Sobarzo M..(2021).Surface Thermal Structure and Variability of Upwelling Shadows in the Gulf of Arauco, Chile.Journal of Geophysical Research: Oceans,126(4).
MLA	Wong Z.,et al."Surface Thermal Structure and Variability of Upwelling Shadows in the Gulf of Arauco, Chile".Journal of Geophysical Research: Oceans 126.4(2021).