DOI: 10.1175/JCLI-D-17-0757.1
Scopus记录号: 2-s2.0-85048150776
论文题名: Soil moisture-evapotranspiration coupling in CMIP5 models: Relationship with simulated climate and projections
作者: Berg A. ; Sheffield J.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 12 起始页码: 4865
结束页码: 4878
语种: 英语
英文关键词: Atmosphere
; Atmosphere-land interaction
; Climate change
; Evapotranspiration
; Land surface
; Soil moisture
Scopus关键词: Climate change
; Earth atmosphere
; Evapotranspiration
; Moisture control
; Soil moisture
; Uncertainty analysis
; Atmosphere-land interactions
; Climate variability and change
; Correlation analysis
; Historical simulation
; Land surface
; Model uncertainties
; Northern Hemispheres
; Surface temperatures
; Climate models
; air-soil interaction
; atmospheric modeling
; climate change
; CMIP
; computer simulation
; evapotranspiration
; land surface
; soil moisture
英文摘要: Soil moisture-atmosphere coupling is a key process underlying climate variability and change over land. The control of soil moisture (SM) on evapotranspiration (ET) is a necessary condition for soil moisture to feed back onto surface climate. Here we investigate how this control manifests itself across simulations from the CMIP5 ensemble, using correlation analysis focusing on the interannual (summertime) time scale. Analysis of CMIP5 historical simulations indicates significant model diversity in SM-ET coupling in terms of patterns and magnitude. We investigate the relationship of this spread with differences in background simulated climate. Mean precipitation is found to be an important driver of model spread in SM-ET coupling but does not explain all of the differences, presumably because of model differences in the treatment of land hydrology. Compared to observations, some land regions appear consistently biased dry and thus likely overly soil moisture-limited. Because of ET feedbacks on air temperature, differences in SM-ET coupling induce model uncertainties across the CMIP5 ensemble in mean surface temperature and variability. We explore the relationships between model uncertainties in SM-ET coupling and climate projections. In particular over mid-to-high-latitude continental regions of the Northern Hemisphere but also in parts of the tropics, models that are more soil moisture-limited in the present tend to warm more in future projections, because they project less increase in ET and (in midlatitudes) greater increase in incoming solar radiation. Soil moisture-atmosphere processes thus contribute to the relationship observed across models between summertime present-day simulated climate and future warming projections over land. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111526
Appears in Collections: 气候减缓与适应
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作者单位: Department of Civil and Environmental Engineering, Princeton University, Princeton, NJ, United States; Department of Geography, University of Southampton, Southampton, United Kingdom
Recommended Citation:
Berg A.,Sheffield J.. Soil moisture-evapotranspiration coupling in CMIP5 models: Relationship with simulated climate and projections[J]. Journal of Climate,2018-01-01,31(12)