DOI: 10.1175/JCLI-D-18-0007.1
Scopus记录号: 2-s2.0-85053042309
论文题名: The influence of CO2 forcing on North American monsoon moisture surges
作者: Pascale S. ; Kapnick S.B. ; Bordoni S. ; Delworth T.L.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 19 起始页码: 7949
结束页码: 7968
语种: 英语
英文关键词: Atmosphere
; Climate change
; Climate models
; Convection
; Monsoons
; North America
Scopus关键词: Atmospheric humidity
; Atmospheric thermodynamics
; Carbon dioxide
; Climate models
; Earth atmosphere
; Heat convection
; Moisture
; Precipitation (meteorology)
; Atmospheric environment
; Convective activity
; Global coupled model
; Gulf of California
; Monsoons
; North America
; Precipitable water
; Thermodynamic changes
; Climate change
英文摘要: Widespread multiday convective bursts in the southwestern United States during the North American monsoon are often triggered by Gulf of California moisture surges (GoC surges). However, how GoC surges, and the amount and intensity of associated precipitation, will change in response to CO2-induced warming remains little known, not least because the most widely available climate models do not currently resolve the relevant mesoscale dynamics because of their coarse resolution (100 km or more). In this study, a 50-km-resolution global coupled model is used to address this question. It is found that the mean number of GoC surge events remains unchanged under CO2 doubling, but intermediate-to-high intensity surge-related precipitation tends to become less frequent, thus reducing the mean summertime rainfall. Low-level moisture fluxes associated with GoC surges as well as their convergence over land to the east of the GoC intensify, but the increases in low-level moisture are not matched by the larger increments in the near-surface saturation specific humidity because of amplified land warming. This results in a more unsaturated low-level atmospheric environment that disfavors moist convection. These thermodynamic changes are accompanied by dynamic changes that are also detrimental to convective activity, with the midlevel monsoonal ridge projected to expand and move to the west of its present-day climatological maximum. Despite the overall reduction in precipitation, the frequency of very intense, localized daily surge-related precipitation in Arizona and surrounding areas is projected to increase with increased precipitable water. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110655
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: NOAA/Geophysical Fluid Dynamics Laboratory, Princeton University, Princeton, NJ, United States; Program in Atmospheric and Oceanic Sciences, Princeton University, Princeton, NJ, United States; California Institute of Technology, Pasadena, CA, United States
Recommended Citation:
Pascale S.,Kapnick S.B.,Bordoni S.,et al. The influence of CO2 forcing on North American monsoon moisture surges[J]. Journal of Climate,2018-01-01,31(19)