DOI: 10.1175/JCLI-D-15-0192.1
Scopus记录号: 2-s2.0-84950121560
论文题名: The Benguela upwelling system: Quantifying the sensitivity to resolution and coastal wind representation in a global climate model
作者: Justin Small R. ; Curchitser E. ; Hedstrom K. ; Kauffman B. ; Large W.G.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2015
卷: 28, 期: 23 起始页码: 9409
结束页码: 9432
语种: 英语
Scopus关键词: Atmospheric movements
; Atmospheric temperature
; Atmospheric thermodynamics
; Coastal engineering
; Fighter aircraft
; Oceanography
; Submarine geophysics
; Surface properties
; Surface waters
; Wind
; Wind stress
; Atmosphere-ocean interactions
; Coupled models
; Ocean model
; Regional model
; Sea surface temperature (SST)
; Upwelling/downwelling
; Climate models
; air-sea interaction
; climate modeling
; coastal zone
; downwelling
; global climate
; sea surface temperature
; sensitivity analysis
; upwelling
; Angola
; Benguela
英文摘要: Of all the major coastal upwelling systems in the world's oceans, the Benguela, located offsouthwest Africa, is the one that climate models find hardest to simulate well. This paper investigates the sensitivity of upwelling processes, and of sea surface temperature (SST), in this region to resolution of the climate model and to the offshore wind structure. The Community Climate System Model (version 4) is used here, together with the Regional Ocean Modeling System. The main result is that a realistic wind stress curl at the eastern boundary, and a high-resolution ocean model, are required to well simulate the Benguela upwelling system. When the wind stress curl is too broad (as with a 1° atmosphere model or coarser), a Sverdrup balance prevails at the eastern boundary, implying southward ocean transport extending as far as 30°S and warm advection. Higher atmosphere resolution, up to 0.5°, does bring the atmospheric jet closer to the coast, but there can be too strong a wind stress curl. The most realistic representation of the upwelling system is found by adjusting the 0.5° atmosphere model wind structure near the coast toward observations, while using an eddy-resolving ocean model. A similar adjustment applied to a 1° ocean model did not show such improvement. Finally, the remote equatorial Atlantic response to restoring SST in a broad region offshore of Benguela is substantial; however, there is not a large response to correcting SST in the narrow coastal upwelling zone alone. © 2015 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50647
Appears in Collections: 气候变化事实与影响
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作者单位: Climate and Global Dynamics Division, National Center for Atmospheric Research, Boulder, CO, United States; Department of Environmental Sciences, Rutgers, The State University of New Jersey, New Brunswick, NJ, United States; Institute of Marine Science, University of Alaska Fairbanks, Fairbanks, AK, United States
Recommended Citation:
Justin Small R.,Curchitser E.,Hedstrom K.,et al. The Benguela upwelling system: Quantifying the sensitivity to resolution and coastal wind representation in a global climate model[J]. Journal of Climate,2015-01-01,28(23)