DOI: 10.1175/JCLI-D-15-0253.1
Scopus记录号: 2-s2.0-84949982456
论文题名: Physical mechanisms of tropical climate feedbacks investigated using temperature and moisture trends
作者: Ferraro A.J. ; Lambert F.H. ; Collins M. ; Miles G.M.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2015
卷: 28, 期: 22 起始页码: 8968
结束页码: 8987
语种: 英语
Scopus关键词: Atmospheric humidity
; Atmospheric temperature
; Feedback
; Satellites
; Tropics
; Troposphere
; Water vapor
; Geographic location
; Geographical patterns
; Regional climate projections
; Regional effects
; Satellite observations
; Surface temperature changes
; Tropospheric temperature
; Water vapor feedbacks
; Climate models
英文摘要: Tropical climate feedback mechanisms are assessed using satellite-observed and model-simulated trends in tropical tropospheric temperature from the MSU/AMSU instruments and upper-tropospheric humidity from the HIRS instruments. Despite discrepancies in the rates of tropospheric warming between observations and models, both are consistent with constant relative humidity over the period 1979-2008. Because uncertainties in satellite-observed tropical-mean trends preclude a constraint on tropical-mean trends in models regional features of the feedbacks are also explored. The regional pattern of the lapse rate feedback is primarily determined by the regional pattern of surface temperature changes, as tropical atmospheric warming is relatively horizontally uniform. The regional pattern of the water vapor feedback is influenced by the regional pattern of precipitation changes, with variations of 1-2 W m-2 K-1 across the tropics (compared to a tropical-mean feedback magnitude of 3.3-4 W m-2 K-1). Thus the geographical patterns of water vapor and lapse rate feedbacks are not correlated, but when the feedbacks are calculated in precipitation percentiles rather than in geographical space they are anticorrelated, with strong positive water vapor feedback associated with strong negative lapse rate feedback. The regional structure of the feedbacks is not related to the strength of the tropical-mean feedback in a subset of the climate models from the CMIP5 archive. Nevertheless the approach constitutes a useful process-based test of climate models and has the potential to be extended to constrain regional climate projections. © 2015 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50782
Appears in Collections: 气候变化事实与影响
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作者单位: College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter, United Kingdom; Remote Sensing Group, STFC Rutherford Appleton Laboratory, Harwell, Oxford, United Kingdom
Recommended Citation:
Ferraro A.J.,Lambert F.H.,Collins M.,et al. Physical mechanisms of tropical climate feedbacks investigated using temperature and moisture trends[J]. Journal of Climate,2015-01-01,28(22)