DOI: 10.1002/2017JC013402
Scopus记录号: 2-s2.0-85040745029
论文题名: Impacts of Mesoscale Eddies on the Vertical Nitrate Flux in the Gulf Stream Region
作者: Zhang S. ; Curchitser E.N. ; Kang D. ; Stock C.A. ; Dussin R.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期: 1 起始页码: 497
结束页码: 513
语种: 英语
英文关键词: eddy-centric composites
; Gulf Stream eddies
; physical-biological modeling
; vertical nitrate flux
Scopus关键词: biogeochemical cycle
; biomass
; composite
; Ekman pumping
; euphotic zone
; flux measurement
; mesoscale eddy
; nitrate
; numerical model
; Reynolds number
; simulation
; Atlantic Ocean
; Atlantic Ocean (Northwest)
; Gulf Stream
英文摘要: The Gulf Stream (GS) region has intense mesoscale variability that can affect the supply of nutrients to the euphotic zone (Zeu). In this study, a recently developed high-resolution coupled physical-biological model is used to conduct a 25-year simulation in the Northwest Atlantic. The Reynolds decomposition method is applied to quantify the nitrate budget and shows that the mesoscale variability is important to the vertical nitrate supply over the GS region. The decomposition, however, cannot isolate eddy effects from those arising from other mesoscale phenomena. This limitation is addressed by analyzing a large sample of eddies detected and tracked from the 25-year simulation. The eddy composite structures indicate that positive nitrate anomalies within Zeu exist in both cyclonic eddies (CEs) and anticyclonic eddies (ACEs) over the GS region, and are even more pronounced in the ACEs. Our analysis further indicates that positive nitrate anomalies mostly originate from enhanced vertical advective flux rather than vertical turbulent diffusion. The eddy-wind interaction-induced Ekman pumping is very likely the mechanism driving the enhanced vertical motions and vertical nitrate transport within ACEs. This study suggests that the ACEs in GS region may play an important role in modulating the oceanic biogeochemical properties by fueling local biomass production through the persistent supply of nitrate. © 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/114736
Appears in Collections: 气候减缓与适应
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作者单位: Department of Environmental Sciences, Rutgers University, New Brunswick, NJ, United States; NOAA Geophysical Fluid Dynamics Laboratory, Princeton University Forrestal Campus, Princeton, NJ, United States
Recommended Citation:
Zhang S.,Curchitser E.N.,Kang D.,et al. Impacts of Mesoscale Eddies on the Vertical Nitrate Flux in the Gulf Stream Region[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(1)