Circulation and structure of the Mackenzie River plume in the coastal Arctic Ocean

doi:10.1016/j.csr.2019.03.006

	Circulation and structure of the Mackenzie River plume in the coastal Arctic Ocean
	Mulligan, Ryan P.1; Perrie, Will 2
刊名	CONTINENTAL SHELF RESEARCH
	2019-04
卷号	177 页码:59-68
关键词	Coastal oceanography Ocean observing River plumes Arctic environments Remote sensing Ocean circulation
ISSN号	0278-4343
DOI	10.1016/j.csr.2019.03.006
英文摘要	The Mackenzie River flows into the Arctic Ocean via a complex network of channels, creating a plume that dominates water properties over the southern Beaufort Sea shelf. Observations of temperature, salinity, water level elevations and currents collected in August 2007 and August 2010 are used to investigate the circulation and structure of the river plume, during periods with predominantly easterly/offshore winds. The measurements were collected from instrument platforms in a river channel, in shallow water of 2-6 m depth (10-25 km from the coastline), from a research vessel, and from satellites. The observations indicate that moderate atmospheric forcing, including sea level pressure changes of 1-2 kPa and easterly alongshore wind stress (< 0.1 Nm(-2)), is sufficient to induce a 0.2-0.3 m set-down of the mean water level and surface currents up to 0.6 ms(-1). A theoretical model of the water level at the delta suggests that local wind stress is the primary driver of sea level variability. The observations show that the region is stratified with a shallow river surface plume at the surface, and winds primarily cause offshore transport of the plume up to 30 km per day. Winds also cause separation of the plume from the coast and onshore transport of shelf water near the bottom that induces local changes in temperature of up to 12 degrees C. River water is the primary source of heat, and therefore sea surface temperatures in the coastal ocean are strongly determined by the inflowing freshwater temperatures. The coastal plume responds to atmospheric forcing over timescales of less than 1 day, leading to rapid development of strong currents and large fluctuations in water mass properties in the shallow region across the submarine delta.
WOS研究方向	Oceanography
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000464771500007
内容类型	期刊论文
源URL	[http://ir.fio.com.cn:8080/handle/2SI8HI0U/27583]
专题	自然资源部第一海洋研究所
通讯作者	Mulligan, Ryan P.
作者单位	1.Queens Univ, Dept Civil Engn, Kingston, ON K7L 3N6, Canada 2.Fisheries & Oceans Canada, Bedford Inst Oceanog, 1 Challenger Dr, Dartmouth, NS B2Y 4A2, Canada
推荐引用方式 GB/T 7714	Mulligan, Ryan P.,Perrie, Will. Circulation and structure of the Mackenzie River plume in the coastal Arctic Ocean[J]. CONTINENTAL SHELF RESEARCH,2019,177:59-68.
APA	Mulligan, Ryan P.,&Perrie, Will.(2019).Circulation and structure of the Mackenzie River plume in the coastal Arctic Ocean.CONTINENTAL SHELF RESEARCH,177,59-68.
MLA	Mulligan, Ryan P.,et al."Circulation and structure of the Mackenzie River plume in the coastal Arctic Ocean".CONTINENTAL SHELF RESEARCH 177(2019):59-68.