DOI: 10.1002/2017GB005743
Scopus记录号: 2-s2.0-85042108957
论文题名: Biogeochemical Role of Subsurface Coherent Eddies in the Ocean: Tracer Cannonballs, Hypoxic Storms, and Microbial Stewpots?
作者: Frenger I ; , Bianchi D ; , Stührenberg C ; , Oschlies A ; , Dunne J ; , Deutsch C ; , Galbraith E ; , Schütte F
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2018
卷: 32, 期: 2 起始页码: 226
结束页码: 249
语种: 英语
英文关键词: coherent
; eddies
; hypoxic
; ocean
; subsurface
; transport
Scopus关键词: biogeochemistry
; census
; eddy
; extreme event
; global climate
; gyre
; hypoxic conditions
; oxygen
; parameterization
; pycnocline
; subsurface flow
; subtropical region
; upwelling
; Pacific Ocean
英文摘要: Subsurface eddies are known features of ocean circulation, but the sparsity of observations prevents an assessment of their importance for biogeochemistry. Here we use a global eddying (0.1°) ocean-biogeochemical model to carry out a census of subsurface coherent eddies originating from eastern boundary upwelling systems (EBUS) and quantify their biogeochemical effects as they propagate westward into the subtropical gyres. While most eddies exist for a few months, moving over distances of hundreds of kilometers, a small fraction (<5%) of long-lived eddies propagates over distances greater than 1,000 km, carrying the oxygen-poor and nutrient-rich signature of EBUS into the gyre interiors. In the Pacific, transport by subsurface coherent eddies accounts for roughly 10% of the offshore transport of oxygen and nutrients in pycnocline waters. This “leakage” of subsurface waters can be a significant fraction of the transport by nutrient-rich poleward undercurrents and may contribute to the well-known reduction of productivity by eddies in EBUS. Furthermore, at the density layer of their cores, eddies decrease climatological oxygen locally by close to 10%, thereby expanding oxygen minimum zones. Finally, eddies represent low-oxygen extreme events in otherwise oxygenated waters, increasing the area of hypoxic waters by several percent and producing dramatic short-term changes that may play an important ecological role. Capturing these nonlocal effects in global climate models, which typically include noneddying oceans, would require dedicated parameterizations. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77670
Appears in Collections: 气候变化事实与影响
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作者单位: GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany; Atmospheric and Oceanic Sciences, University of California, Los Angeles, CA, United States; Kiel University, Kiel, Germany; NOAA Geophysical Fluid Dynamics Laboratory, Princeton, NJ, United States; School of Oceanography, University of Washington, Seattle, WA, United States; Institut de Ciencia i Technologia Ambientals (ICTA) and Department of Mathematics, Universitat Autonoma de Barcelona, Barcelona, Spain; Institució Catalana de Recerca i Estudis Avançats (ICREA), Barcelona, Spain
Recommended Citation:
Frenger I,, Bianchi D,, Stührenberg C,et al. Biogeochemical Role of Subsurface Coherent Eddies in the Ocean: Tracer Cannonballs, Hypoxic Storms, and Microbial Stewpots?[J]. Global Biogeochemical Cycles,2018-01-01,32(2)