DOI: 10.1175/JCLI-D-16-0109.1
Scopus记录号: 2-s2.0-84996867981
论文题名: Coupled ocean-atmosphere offshore decay scale of cold SST signals along upwelling eastern boundaries
作者: Spall M.A. ; Schneider N.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2016
卷: 29, 期: 23 起始页码: 8317
结束页码: 8331
语种: 英语
Scopus关键词: Air
; Atmospheric boundary layer
; Atmospheric movements
; Atmospheric temperature
; Boundary layer flow
; Boundary layers
; Heat flux
; Surface waters
; Baroclinic instability
; Boundary layer temperature
; Coastal flow
; Ekman pumping/transport
; Ocean dynamics
; Oceanic mixed layers
; Sea surface temperature (SST)
; Wind driven upwelling
; Oceanography
英文摘要: A simple analytic model is developed to represent the offshore decay of cold sea surface temperature (SST) signals that originate from wind-driven upwelling at a coastal boundary. The model couples an oceanic mixed layer to an atmospheric boundary layer through wind stress and air-sea heat exchange. The primary mechanism that controls SST is a balance between Ekman advection and air-sea exchange. The offshore penetration of the cold SST signal decays exponentially with a length scale that is the product of the ocean Ekman velocity and a time scale derived from the air-sea heat flux and the radiative balance in the atmospheric boundary layer. This cold SST signal imprints on the atmosphere in terms of both the boundary layer temperature and surface wind. Nonlinearities due to the feedback between SST and atmospheric wind, baroclinic instability, and thermal wind in the atmospheric boundary layer all slightly modify this linear theory. The decay scales diagnosed from two-dimensional and three-dimensional eddy-resolving numerical ocean models are in close agreement with the theory, demonstrating that the basic physics represented by the theory remain dominant even in these more complete systems. Analysis of climatological SST off the west coast of the United States also shows a decay of the cold SST anomaly with scale roughly in agreement with the theory. © 2016 American Meteorological Society. 资助项目: NASA, National Aeronautics and Space Administration
; NSF, National Science Foundation
; NSF, National Science Foundation
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50159
Appears in Collections: 气候变化事实与影响
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作者单位: Woods Hole Oceanographic Institution, Woods Hole, MA, United States; International Pacific Research Center, University of Hawaii, Honolulu, HI, United States
Recommended Citation:
Spall M.A.,Schneider N.. Coupled ocean-atmosphere offshore decay scale of cold SST signals along upwelling eastern boundaries[J]. Journal of Climate,2016-01-01,29(23)