DOI: 10.1007/s00382-016-3142-3
Scopus记录号: 2-s2.0-84965006975
论文题名: Mechanisms controlling the SST air-sea heat flux feedback and its dependence on spatial scale
作者: Hausmann U. ; Czaja A. ; Marshall J.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2017
卷: 48, 期: 2017-03-04 起始页码: 1297
结束页码: 1307
语种: 英语
英文关键词: Air-sea interaction
; Feedback
; North Atlantic
; Sea surface temperature
; Southern Ocean
; Variability
英文摘要: The turbulent air-sea heat flux feedback (α, in Wm-2K-1) is a major contributor to setting the damping timescale of sea surface temperature (SST) anomalies. In this study we compare the spatial distribution and magnitude of α in the North Atlantic and the Southern Ocean, as estimated from the ERA-Interim reanalysis dataset. The comparison is rationalized in terms of an upper bound on the heat flux feedback, associated with “fast” atmospheric export of temperature and moisture anomalies away from the marine boundary layer, and a lower bound associated with “slow” export. It is found that regions of cold surface waters (≤ 10 ∘C) are best described as approaching the slow export limit. This conclusion is not only valid at the synoptic scale resolved by the reanalysis data, but also on basin scales. In particular, it applies to the heat flux feedback acting as circumpolar SST anomaly scales are approached in the Southern Ocean, with feedbacks of ≤ 10 Wm-2K-1. In contrast, the magnitude of the heat flux feedback is close to that expected from the fast export limit over the Gulf Stream and its recirculation with values on the order of ≈40 Wm-2K-1. Further analysis suggests that this high value reflects a compensation between a moderate thermodynamic adjustment of the boundary layer, which tends to weaken the heat flux feedback, and an enhancement of the surface winds over warm SST anomalies, which tend to enhance the feedback. © 2016, Springer-Verlag Berlin Heidelberg. 资助项目: 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/53376
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Earth Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, United States; Department of Physics, Imperial College London, London, United Kingdom; Department of Applied Ocean Physics and Engineering, Woods Hole Oceanographic Institution, Woods Hole, MA, United States
Recommended Citation:
Hausmann U.,Czaja A.,Marshall J.. Mechanisms controlling the SST air-sea heat flux feedback and its dependence on spatial scale[J]. Climate Dynamics,2017-01-01,48(2017-03-04)