DOI: 10.1175/JCLI-D-17-0574.1
Scopus记录号: 2-s2.0-85047076329
论文题名: Mechanism of future spring drying in the Southwestern United States in CMIP5 models
作者: Ting M. ; Seager R. ; Li C. ; Liu H. ; Henderson N.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 11 起始页码: 4265
结束页码: 4279
语种: 英语
英文关键词: Anthropogenic effects
; Climate models
; Hydrologic cycle
; Moisture/moisture budget
; North America
; Precipitation
Scopus关键词: Advection
; Budget control
; Drying
; Moisture
; Precipitation (chemical)
; Surface waters
; Anthropogenic effects
; Atmospheric moisture content
; Hydrologic cycles
; Moisture convergence
; Moisture flux convergences
; Moisture/moisture budgets
; North America
; Thermodynamic changes
; Climate models
英文摘要: The net surface water budget, precipitation minus evaporation (P - E), shows a clear seasonal cycle in the U.S. Southwest with a net gain of surface water (positive P - E) in the cold half of the year (October-March) and a net loss of water (negative P - E) in the warm half (April-September), with June and July being the driest months of the year. There is a significant shift of the summer drying toward earlier in the year under a CO2 warming scenario, resulting in substantial spring drying (March-May) of the U.S. Southwest from the near-term future to the end of the current century, with gradually increasing magnitude. While the spring drying has been identified in previous studies, its mechanism has not been fully addressed. Using moisture budget analysis, it was found that the drying is mainly due to decreased mean moisture convergence, partially compensated by the increase in transient eddy moisture flux convergence. The decreased mean moisture convergence is further separated into components as a result of changes in circulation (dynamic changes) and changes in atmospheric moisture content (thermodynamic changes). The drying is found to be dominated by the thermodynamic-driven changes in column-averaged moisture convergence, mainly due to increased dry zonal advection caused by the climatological land-ocean thermal contrast, rather than by the well-known "dry get drier" mechanism. Furthermore, the enhanced dry advection in the warming climate is dominated by the robust zonal mean atmospheric warming, leading to equally robust spring drying in the southwestern United States. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111529
Appears in Collections: 气候减缓与适应
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作者单位: Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States
Recommended Citation:
Ting M.,Seager R.,Li C.,et al. Mechanism of future spring drying in the Southwestern United States in CMIP5 models[J]. Journal of Climate,2018-01-01,31(11)