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Eddy-induced cross-slope exchange maintaining summer high productivity of the Bering Sea shelf break

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Title: Eddy-induced cross-slope exchange maintaining summer high productivity of the Bering Sea shelf break
Authors: Mizobata, Kohei Browse this author
Wang, Jia Browse this author
Saitoh, Sei-ichi Browse this author →KAKEN DB
Keywords: Bering Sea eddy
cross-slope exchange
on-shelf flux
hydrographic observation
numerical model
Issue Date: 31-Oct-2006
Publisher: American Geophysical Union
Journal Title: Journal of Geophysical Research-Oceans
Volume: 111
Issue: C10
Start Page: C10017
Publisher DOI: 10.1029/2005JC003335
Abstract: Eddy-related cross-slope exchange along the Bering Sea shelf break was investigated using a hydrographic observations data set and a numerical model. Results of observations in summer of 2001 showed a shelf break front that formed at a shelf break near an anticyclonic eddy, high nitrate-nitrite concentrations in the subsurface layer, and high chlorophyll a (Chl-a) concentrations (≥6 mg m−3) in the surface layer. A hydrographic observation in summer of 2002 exhibited relatively high Chl-a concentrations at the surface around the anticyclonic eddy. Tracer experiments revealed two types of cross-slope exchange. Under isopycnals, nutrient-rich water in the basin is transported to the shelf and there is about a 64.53% increase in integrated nitrate-nitrite on-shelf flux (50 m depth ∼bottom), when mesoscale eddies are formed and propagated along the shelf break. At the surface, high Chl-a waters in the shelf are advected to the deep basin area by eddy transport and propagation. These indicate that (1) mesoscale eddies supply nutrients and sustain primary productivity at the shelf break, and (2) eddies expand the high Chl-a area to the basin, then to the highly productive area, so that the Green Belt is maintained.
Rights: An edited version of this paper was published by AGU. Copyright 2006, American Geophysical Union, JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS, Vol. 111-C10
Type: article (author version)
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 齊藤 誠一

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