DOI: 10.1175/JCLI-D-16-0351.1
Scopus记录号: 2-s2.0-85001132455
论文题名: Understanding decreases in land relative humidity with global warming: Conceptual model and GCM simulations
作者: Byrne M.P. ; O'Gorman P.A.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2016
卷: 29, 期: 24 起始页码: 9045
结束页码: 9061
语种: 英语
Scopus关键词: Atmospheric movements
; Budget control
; Climate change
; Climate models
; Evapotranspiration
; Global warming
; Moisture
; Oceanography
; Surface measurement
; Atmosphere-land interactions
; Atmospheric moisture
; General circulation model
; Land surface
; Land surface air temperatures
; Moisture transport
; Surface evapotranspiration
; Water budget
; Atmospheric humidity
英文摘要: Climate models simulate a strong land-ocean contrast in the response of near-surface relative humidity to global warming; relative humidity tends to increase slightly over oceans but decrease substantially over land. Surface energy balance arguments have been used to understand the response over ocean but are difficult to apply over more complex land surfaces. Here, a conceptual box model is introduced, involving atmospheric moisture transport between the land and ocean and surface evapotranspiration, to investigate the decreases in land relative humidity as the climate warms. The box model is applied to simulations with idealized and full-complexity (CMIP5) general circulation models, and it is found to capture many of the features of the simulated changes in land humidity. The simplest version of the box model gives equal fractional increases in specific humidity over land and ocean. This relationship implies a decrease in land relative humidity given the greater warming over land than ocean and modest changes in ocean relative humidity, consistent with a mechanism proposed previously. When evapotranspiration is included, it is found to be of secondary importance compared to ocean moisture transport for the increase in land specific humidity, but it plays an important role for the decrease in land relative humidity. For the case of a moisture forcing over land, such as from stomatal closure, the response of land relative humidity is strongly amplified by the induced change in land surface-air temperature, and this amplification is quantified using a theory for the link between land and ocean temperatures. © 2016 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50288
Appears in Collections: 气候变化事实与影响
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作者单位: ETH Zürich, Zurich, Switzerland; Massachusetts Institute of Technology, Cambridge, MA, United States
Recommended Citation:
Byrne M.P.,O'Gorman P.A.. Understanding decreases in land relative humidity with global warming: Conceptual model and GCM simulations[J]. Journal of Climate,2016-01-01,29(24)