气候变化领域集成服务门户(CCPortal): Nutrient-Rich Gravity Current Formed by Upwelling in Barrow Canyon: High-Resolution Observations

CCPortal

DOI	10.1029/2020JC016160
	Nutrient-Rich Gravity Current Formed by Upwelling in Barrow Canyon: High-Resolution Observations
	Beaird N.L.; Shroyer E.L.; Juranek L.W.; Hales B.; Goñi M.A.
发表日期	2020
ISSN	21699275
卷号	125 期号:7
英文摘要	The distribution of nutrients influences the Chukchi Sea's rich ecosystems and affectsthe biogeochemistry of the central Arctic. Nutrients that become limiting in the late summer can be replenished episodically by physical processes that are likely to change in concert with Arctic climate trends. Here we report on unique, simultaneous, physical, and biogeochemical measurements of one such process: upwelling in Barrow Canyon. High-resolution transects of a towed vehicle, which was equipped with physical, turbulence, and biogeochemical sensors, captured the upwelling of dense, salty, and nitrate-rich waters into the shallow regions of Barrow Canyon. Upwelling drastically modifies the nitrate distribution of Barrow Canyon through the vertical advection of Atlantic Water from the Canada Basin and through turbulent flux across the nutricline. Upwelled waters form a highly sheared gravity current that is susceptible to both baroclinic and symmetric instabilities. The current exhibits transverse circulation common to frictional gravity currents. Our observations suggest that rapid and dramatic nutrient changes in Barrow Canyon can be accomplished by upwelling; the subsequent formation of unstable jets and fronts enhances the irreversible flux of upwelled nutrients to less dense waters in the Chukchi sea. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	arctic; Barrow Canyon; nutrients; oceanography; turbulence; upwelling
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/186774
作者单位	Department of Marine and Coastal Sciences, Rutgers University, New Brunswick, NJ, United States; College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR, United States
推荐引用方式 GB/T 7714	Beaird N.L.,Shroyer E.L.,Juranek L.W.,et al. Nutrient-Rich Gravity Current Formed by Upwelling in Barrow Canyon: High-Resolution Observations[J],2020,125(7).
APA	Beaird N.L.,Shroyer E.L.,Juranek L.W.,Hales B.,&Goñi M.A..(2020).Nutrient-Rich Gravity Current Formed by Upwelling in Barrow Canyon: High-Resolution Observations.Journal of Geophysical Research: Oceans,125(7).
MLA	Beaird N.L.,et al."Nutrient-Rich Gravity Current Formed by Upwelling in Barrow Canyon: High-Resolution Observations".Journal of Geophysical Research: Oceans 125.7(2020).