DOI: 10.1175/JCLI-D-12-00155.1
Scopus记录号: 2-s2.0-84872975471
论文题名: The circulation response to idealized changes in stratospheric water vapor
作者: Maycock A.C. ; Joshi M.M. ; Shine K.P. ; Scaife A.A.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期: 2 起始页码: 545
结束页码: 561
语种: 英语
Scopus关键词: 850-hPa
; Boreal winters
; Brewer-Dobson circulation
; Circulation changes
; Extratropical
; Lower stratosphere
; Maximum amplitude
; Meridional dipole
; Midlatitudes
; Storm track
; Stratospheric circulations
; Stratospheric temperature
; Subtropical jet
; Surface climate
; Tropospheric circulation
; Wave drags
; Zonal wind
; Zonal-mean zonal winds
; Tropics
; Troposphere
; Vapors
; air temperature
; atmospheric circulation
; atmospheric general circulation model
; atmospheric pressure
; climate change
; concentration (composition)
; stratosphere
; trend analysis
; troposphere
; water vapor
; zonal wind
英文摘要: Observations show that stratospheric water vapor (SWV) concentrations increased by ;30% between 1980 and 2000. SWVhas also been projected to increase by up to a factor of 2 over the twenty-first century. Trends in SWV impact stratospheric temperatures, which may lead to changes in the stratospheric circulation. Perturbations in temperature and wind in the stratosphere have been shown to influencethe extratropical tropospheric circulation. This study investigates the response to a uniform doubling in SWV from 3 to 6 ppmv in a comprehensive stratosphere-resolving atmospheric GCM. The increase in SWV causes stratospheric cooling with a maximum amplitude of 5-6 K in the polar lower stratosphere and 2-3 K in the tropical lower stratosphere. The zonal wind on the upper flanks of the subtropical jets is more westerly by up to ~5 m s-1. Changes in resolved wave drag in the stratosphere result in an increase in the strength of tropical upwelling associated with the Brewer-Dobson circulation of ;10% throughout the year. In the troposphere, the increase in SWV causes significant meridional dipole changes in the midlatitude zonal-mean zonal wind of up to 2.8 m s-1 at 850 hPa, which are largest in boreal winter in both hemispheres. This suggests a more poleward storm track under uniformly increased stratospheric water vapor. The circulation changes in both the stratosphere and troposphere are almostentirely due to the increase in SWV at pressures greater than 50 hPa. The results show that long-termtrends in SWV may impact stratospheric temperatures and wind, the strength of the Brewer-Dobson circulation, and extratropical surface climate. © 2013 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52067
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Meteorology, University of Reading, Reading, United Kingdom; National Centre for Atmospheric Science, University of Reading, Reading, United Kingdom; Met Office Hadley Centre, Met Office, Exeter, United Kingdom
Recommended Citation:
Maycock A.C.,Joshi M.M.,Shine K.P.,et al. The circulation response to idealized changes in stratospheric water vapor[J]. Journal of Climate,2013-01-01,26(2)