DOI: 10.1175/JCLI-D-15-0749.1
Scopus记录号: 2-s2.0-85012283290
论文题名: A "cold path" for the gulf stream-troposphere connection
作者: Vannière B. ; Czaja A. ; Dacre H. ; Woollings T.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2017
卷: 30, 期: 4 起始页码: 1363
结束页码: 1379
语种: 英语
Scopus关键词: Atmospheric temperature
; Boundary layers
; Ocean currents
; Storms
; Surface waters
; Air sea interactions
; Cold front
; Convective precipitation
; Extratropical cyclones
; Meridional circulation
; North Atlantic Ocean
; Sea surface temperature (SST)
; Surface wind convergence
; Oceanography
; air-sea interaction
; boundary layer
; cold front
; extratropical cyclone
; sea surface temperature
; temperature gradient
; troposphere
; Atlantic Ocean
; Atlantic Ocean (North)
; Gulf Stream
英文摘要: The mechanism by which the Gulf Stream sea surface temperature (SST) front anchors a band of precipitation on its warm edge is still a matter of debate, and little is known about how synoptic activity contributes to the mean state. In the present study, the influence of the SST front on precipitation is investigated during the course of a single extratropical cyclone using a regional configuration of the Met Office Unified Model. The comparison of a control run with a simulation in which SST gradients were smoothed brought the following conclusions: a band of precipitation is reproduced for a single extratropical cyclone, and the response to the SST gradient is dominated by a change of convective precipitation in the cold sector of the storm. Several climatological features described by previous studies, such as surface wind convergence on the warm edge or a meridional circulation cell across the SST front, are also reproduced at synoptic time scales in the cold sector. Based on these results, a simple boundary layer model is proposed to explain the convective and dynamical response to the SST gradient in the cold sector. In this model, cold and dry air parcels acquire more buoyancy over a sharp SST gradient and become more convectively unstable. The convection sets a pressure anomaly over the entire depth of the boundary layer that drives wind convergence. This case study offers a new pathway by which the SST gradient can anchor a climatological band of precipitation. © 2017 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49763
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Physics Department, Imperial College London, London, United Kingdom; Department of Meteorology, University of Reading, Reading, United Kingdom; Atmospheric Physics Clarendon Laboratory, Oxford University, Oxford, United Kingdom
Recommended Citation:
Vannière B.,Czaja A.,Dacre H.,et al. A "cold path" for the gulf stream-troposphere connection[J]. Journal of Climate,2017-01-01,30(4)