DOI: 10.1175/JCLI-D-14-00153.1
Scopus记录号: 2-s2.0-84907813194
论文题名: Dynamical and thermodynamical causes of large-scale changes in the hydrological cycle over North America in response to global warming
作者: Seager R. ; Neelin D. ; Simpson I. ; Liu H. ; Henderson N. ; Shaw T. ; Kushnir Y. ; Ting M. ; Cook B.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 20 起始页码: 7921
结束页码: 7948
语种: 英语
Scopus关键词: Hydrological cycles
; Thermodynamical
; atmospheric moisture
; climate change
; climate effect
; computer simulation
; eddy
; evaporation
; global warming
; hydrological cycle
; weather forecasting
; winter
; California
; Great Plains
; United States
英文摘要: The mechanisms of model-projected atmospheric moisture budget change across North America are examined in simulations conducted with 22 models from phase 5 of the Coupled Model Intercomparison Project. Modern-day model budgets are validated against the European Centre for Medium-Range Weather Forecasts Interim Re-Analysis. In the winter half year transient eddies converge moisture across the continent while the mean flow wets the west from central California northward and dries the southwest. In the summer half year there is widespreadmean flowmoisture divergence across thewest and convergence over theGreat Plains that is offset by transient eddy divergence. In the winter half year the models project drying for the southwest and wetting to the north. Changes in the mean flowmoisture convergence are largely responsible across the west but intensified transient eddymoisture convergence wets the northeast. In the summer half year widespread declines in precipitationminus evaporation (P2 E) are supported bymean flow moisture divergence across the west and transient eddy divergence in the Great Plains. The changes in mean flow convergence are related to increases in specific humidity but also depend on changes in the mean flow including increased low-level divergence in the U.S. Southwest and a zonally varying wave that wets theNorthAmerican west and east coasts inwinter and dries the U.S. Southwest. Increased transient eddy fluxes occur even as low-level eddy activity weakens and arise from strengthened humidity gradients. A full explanation of North American hydroclimate changes will require explanation ofmean and transient circulation changes and the coupling between themoisture and circulation fields. © 2014 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51227
Appears in Collections: 气候变化事实与影响
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作者单位: Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, United States; Department of Atmospheric Sciences, University of California at Los Angeles, Los Angeles, CA, United States; NASA Goddard Institute for Space Studies, New York, NY, United States
Recommended Citation:
Seager R.,Neelin D.,Simpson I.,et al. Dynamical and thermodynamical causes of large-scale changes in the hydrological cycle over North America in response to global warming[J]. Journal of Climate,2014-01-01,27(20)