DOI: 10.1007/s00382-015-2669-z
Scopus记录号: 2-s2.0-84959112810
论文题名: Influence of small-scale North Atlantic sea surface temperature patterns on the marine boundary layer and free troposphere: a study using the atmospheric ARPEGE model
作者: Piazza M. ; Terray L. ; Boé J. ; Maisonnave E. ; Sanchez-Gomez E.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2016
卷: 46, 期: 2017-05-06 起始页码: 1699
结束页码: 1717
语种: 英语
英文关键词: Air–sea interaction
; North Atlantic weather regimes
; Rossby wave breaking
; Storm track
; The Gulf Stream
英文摘要: A high-resolution global atmospheric model is used to investigate the influence of the representation of small-scale North Atlantic sea surface temperature (SST) patterns on the atmosphere during boreal winter. Two ensembles of forced simulations are performed and compared. In the first ensemble (HRES), the full spatial resolution of the SST is maintained while small-scale features are smoothed out in the Gulf Stream region for the second ensemble (SMTH). The model shows a reasonable climatology in term of large-scale circulation and air–sea interaction coefficient when compared to reanalyses and satellite observations, respectively. The impact of small-scale SST patterns as depicted by differences between HRES and SMTH shows a strong meso-scale local mean response in terms of surface heat fluxes, convective precipitation, and to a lesser extent cloudiness. The main mechanism behind these statistical differences is that of a simple hydrostatic pressure adjustment related to increased SST and marine atmospheric boundary layer temperature gradient along the North Atlantic SST front. The model response to small-scale SST patterns also includes remote large-scale effects: upper tropospheric winds show a decrease downstream of the eddy-driven jet maxima over the central North Atlantic, while the subtropical jet exhibits a significant northward shift in particular over the eastern Mediterranean region. Significant changes are simulated in regard to the North Atlantic storm track, such as a southward shift of the storm density off the coast of North America towards the maximum SST gradient. A storm density decrease is also depicted over Greenland and the Nordic seas while a significant increase is seen over the northern part of the Mediterranean basin. Changes in Rossby wave breaking frequencies and weather regimes spatial patterns are shown to be associated to the jets and storm track changes. © 2015, Springer-Verlag Berlin Heidelberg. 资助项目: ANR, Agence Nationale de la Recherche
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53784
Appears in Collections: 过去全球变化的重建
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作者单位: Sciences de l’Univers au CERFACS, SUC URA1875, CERFACS/CNRS, Toulouse, France
Recommended Citation:
Piazza M.,Terray L.,Boé J.,et al. Influence of small-scale North Atlantic sea surface temperature patterns on the marine boundary layer and free troposphere: a study using the atmospheric ARPEGE model[J]. Climate Dynamics,2016-01-01,46(2017-05-06)