DOI: 10.1175/JCLI-D-11-00731.1
Scopus记录号: 2-s2.0-84874869617
论文题名: The tropospheric land-sea warming contrast as the driver of tropical sea level pressure changes
作者: Bayr T. ; Dommenget D.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期: 4 起始页码: 1387
结束页码: 1402
语种: 英语
Scopus关键词: Atmospheric circulation changes
; Deep convection
; Model simulation
; Sea level pressure
; Sensitivity coefficient
; Simple Physical Models
; Surface temperatures
; Tropospheric temperature
; Atmospheric temperature
; Climate change
; Computer simulation
; Lakes
; Sea level
; Troposphere
; Tropics
; air temperature
; atmospheric circulation
; climate change
; land-sea interaction
; sea level pressure
; troposphere
; warm pool
; warming
英文摘要: This article addresses the causes of the large-scale tropical sea level pressure (SLP) changes during climate change. The analysis presented here is based on model simulations, observed trends, and the seasonal cycle. In all three cases the regional changes of tropospheric temperature (Ttropos) and SLP are strongly related to each other [considerably more strongly than (sea) surface temperature and SLP]. This relationship basically follows the Bjerknes circulation theorem, with relatively low regional SLP where there is relatively high Ttropos and vice versa. A simple physical model suggests a tropical SLP response to horizontally inhomogeneous warming in the tropical Ttropos, with a sensitivity coefficient of about-1.7 hPa K-1. This relationship explains a large fraction of observed and predicted changes in the tropical SLP. It is shown that in climate change model simulations the tropospheric land-sea warming contrast is the most significant structure in the regional Ttropos changes relative to the tropical mean changes. Since the land-sea warming contrast exists in the absence of any atmospheric circulation changes, it can be argued that the largescale response of tropical SLP changes is to first order a response to the tropical land-sea warming contrast. Furthermore, as the land-sea warming contrast is mostly moisture dependent, the models predict a stronger warming and decreasing SLP in the drier regions from South America to Africa and a weaker warming and increasing SLP over the wetter Indo-Pacific warm pool region. This suggests an increase in the potential for deep convection conditions over the Atlantic sector and a decrease over the Indo-Pacific warm pool region in the future. © 2013 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52023
Appears in Collections: 气候变化事实与影响
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作者单位: Helmholtz Centre for Ocean Research Kiel (GEOMAR), Kiel, Germany; School of Mathematical Sciences, Monash University, Clayton, Vic., Australia
Recommended Citation:
Bayr T.,Dommenget D.. The tropospheric land-sea warming contrast as the driver of tropical sea level pressure changes[J]. Journal of Climate,2013-01-01,26(4)