气候变化领域集成服务门户(CCPortal): Physical Controls on the Macrofaunal Benthic Biomass in Barrow Canyon, Chukchi Sea

CCPortal

DOI	10.1029/2020JC017091
	Physical Controls on the Macrofaunal Benthic Biomass in Barrow Canyon, Chukchi Sea
	Pickart R.S.; Spall M.A.; Lin P.; Bahr F.; McRaven L.T.; Arrigo K.R.; Grebmeier J.M.
发表日期	2021
ISSN	21699275
卷号	126 期号:5
英文摘要	A region of exceptionally high macrofaunal benthic biomass exists in Barrow Canyon, implying a carbon export process that is locally concentrated. Here we offer an explanation for this benthic “hotspot” using shipboard data together with a set of dynamical equations. Repeat occupations of the Distributed Biological Observatory transect in Barrow Canyon reveal that when the northward flow is strong and the density front in the canyon is sharp, plumes of fluorescence and oxygen extend from the pycnocline to the seafloor in the vicinity of the hotspot. By solving the quasi-geostrophic omega equation with an analytical flow field fashioned after the observations, we diagnose the vertical velocity in the canyon. This reveals that, as the along stream flow converges into the canyon, it drives a secondary circulation cell with strong downwelling on the cyclonic side of the northward flow. The downwelling quickly advects material from the pycnocline to the seafloor in a vertical plume analogous to those seen in the observations. The plume occurs only when the phytoplankton reside in the pycnocline, since the near-surface vertical velocity is weak, also consistent with the observations. Using a wind-based proxy to represent the strength of the northward flow and hence the pumping, in conjunction with a satellite-derived phytoplankton source function, we construct a time series of carbon supply to the bottom of Barrow Canyon. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	Barrow Canyon; benthic fauna; Chukchi Sea; dynamics
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/186292
作者单位	Department of Physical Oceanography, Woods Hole Oceanographic Institution, Woods Hole, MA, United States; Department of Earth System Science, Stanford University, Stanford, CA, United States; University of Maryland Center for Environmental Science, Solomons, MD, United States
推荐引用方式 GB/T 7714	Pickart R.S.,Spall M.A.,Lin P.,et al. Physical Controls on the Macrofaunal Benthic Biomass in Barrow Canyon, Chukchi Sea[J],2021,126(5).
APA	Pickart R.S..,Spall M.A..,Lin P..,Bahr F..,McRaven L.T..,...&Grebmeier J.M..(2021).Physical Controls on the Macrofaunal Benthic Biomass in Barrow Canyon, Chukchi Sea.Journal of Geophysical Research: Oceans,126(5).
MLA	Pickart R.S.,et al."Physical Controls on the Macrofaunal Benthic Biomass in Barrow Canyon, Chukchi Sea".Journal of Geophysical Research: Oceans 126.5(2021).