DOI: 10.1002/jgrd.50111
论文题名: The response of the North American Monsoon to increased greenhouse gas forcing
作者: Cook B.I. ; Seager R.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 4 起始页码: 1690
结束页码: 1699
语种: 英语
英文关键词: greenhouse warming
; hydroclimate
; monsoon
; North America
Scopus关键词: Greenhouse gases
; Moisture
; Rain
; Reinforcement
; Stability
; Coupled Model Intercomparison Project
; Ecological consequences
; Greenhouse warming
; Greenhouse-gas forcing
; hydroclimate
; monsoon
; North America
; Seasonal distributions
; Atmospheric thermodynamics
; atmospheric forcing
; emission
; global warming
; greenhouse gas
; monsoon
; numerical model
; precipitation (climatology)
; rainfall
; troposphere
; North America
英文摘要: We analyze the response of the North American Monsoon (NAM) to increased greenhouse gas (GHG) forcing (emissions scenario RCP 8.5) using new simulations available through the Coupled Model Intercomparison Project version 5 (CMIP5). Changes in total monsoon season rainfall with GHG warming are small and insignificant. The models do, however, show significant declines in early monsoon season precipitation (June-July) and increases in late monsoon season (September-October) precipitation, indicating a shift in seasonality toward delayed onset and withdrawal of the monsoon. Early in the monsoon season, tropospheric warming increases vertical stability, reinforced by reductions in available surface moisture, inhibiting precipitation and delaying the onset of the monsoon. By the end of the monsoon season, moisture convergence is sufficient to overcome the warming induced stability increases, and precipitation is enhanced. Even with no change in total NAM rainfall, shifts in the seasonal distribution of precipitation within the NAM region are still likely to have significant societal and ecological consequences, reinforcing the need to not only understand the magnitude, but also the timing, of future precipitation changes. Key PointsWarming suppresses early monsoon rainfall and enhances late monsoon rainfallEarly declines are caused by increased stability due to upper level warmingLater increases occur once moisture convergence can overcome increased stability © 2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63896
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
There are no files associated with this item.
作者单位: NASA Goddard Institute for Space Studies, 2880 Broadway, New York, NY 10025, United States; Lamont-Doherty Earth Observatory, 61 Route 9W, Palisades, NY 10964, United States
Recommended Citation:
Cook B.I.,Seager R.. The response of the North American Monsoon to increased greenhouse gas forcing[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(4)