气候变化领域集成服务门户(CCPortal): Low frequency variations in currents on the southern continental shelf of the Caspian Sea

CCPortal

DOI	10.1016/j.dynatmoce.2019.05.004
	Low frequency variations in currents on the southern continental shelf of the Caspian Sea
	Masoud M.; Pawlowicz R.; Montazeri Namin M.
发表日期	2019
ISSN	03770265
卷号	87
英文摘要	The Caspian Sea (CS) is the largest enclosed basin in the world, located inside the Eurasian continent in the Northern Hemisphere. Although there have been few studies of the dynamics of the coastal zone in the CS, observations show that oscillations with periods from 2–3 days to 1–3 weeks dominate. These oscillations are presumed to be related to the synoptic variability of direct wind impact and to coastally-trapped waves (CTW). Here, we describe and interpret current meter observations on the continental margins of the southern CS from 2012 to 2014 to identify and characterize CTW there. Time series analysis provides evidence for both remote and locally wind-forced eastward traveling signals with time lags consistent with CTW theory. A wind-forced model with two CTW modes is able to reproduce the structure, amplitudes, and phases of observed alongshore current fluctuations, explaining half of the variance at frequencies less than 1 cpd. Remote forcing effects are present at all times, but are most striking when the local winds are weak, as in summer. The CTW calculations also suggest that the source region for the remote forcing may extend farther north along the west coast of the CS. © 2019 Elsevier B.V.
英文关键词	Caspian Sea; Coastal trapped waves; Continental shelf; CTW model; Current meter observation; Spectral analysis
语种	英语
scopus关键词	Spectrum analysis; Water waves; Caspian sea; Coastal-trapped wave; Coastally trapped waves; Continental shelves; Current meters; Low-frequency variations; Northern Hemispheres; Synoptic variability; Time series analysis; coastal zone; continental margin; continental shelf; saline lake; shore (nonmarine); spectral analysis; wind field; wind forcing; wind wave; Caspian Sea
来源期刊	Dynamics of Atmospheres and Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/178367
作者单位	School of Civil Engineering, College of Engineering, University of Tehran, Tehran, Iran; Dept. of Earth, Ocean and Atmospheric Sciences, University of British Columbia, 2207 Main Mall, Vancouver, B.C. V6T 1Z4, Canada
推荐引用方式 GB/T 7714	Masoud M.,Pawlowicz R.,Montazeri Namin M.. Low frequency variations in currents on the southern continental shelf of the Caspian Sea[J],2019,87.
APA	Masoud M.,Pawlowicz R.,&Montazeri Namin M..(2019).Low frequency variations in currents on the southern continental shelf of the Caspian Sea.Dynamics of Atmospheres and Oceans,87.
MLA	Masoud M.,et al."Low frequency variations in currents on the southern continental shelf of the Caspian Sea".Dynamics of Atmospheres and Oceans 87(2019).