DOI: 10.1175/JCLI-D-13-00223.1
Scopus记录号: 2-s2.0-84887155092
论文题名: Warm conveyor belts in the ERA-Interim Dataset (1979-2010). Part II: Moisture origin and relevance for precipitation
作者: Pfahl S. ; Madonna E. ; Boettcher M. ; Joos H. ; Wernli H.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 1 起始页码: 27
结束页码: 40
语种: 英语
Scopus关键词: Extratropical cyclones
; Extreme events
; Extreme precipitation events
; Latent heating/cooling
; Low relative humidities
; Moisture/moisture budgets
; Precipitation extremes
; Precipitation formation
; Belt conveyors
; Evaporation
; Precipitation (chemical)
; Precipitation (meteorology)
; Storms
; Weather forecasting
; Moisture
; atmospheric dynamics
; cooling
; cyclone
; extratropical environment
; extreme event
; latent heat flux
; moisture flux
; precipitation (climatology)
; Atlantic Ocean
; Atlantic Ocean (North)
; Atlantic Ocean (South)
; Pacific Ocean
; Pacific Ocean (North)
; Pacific Ocean (South)
英文摘要: The role of moisture for extratropical atmospheric dynamics is particularly pronounced within warm conveyor belts (WCBs), which are characterized by intense latent heat release and precipitation formation. Based on the WCB climatology for the period 1979-2010 presented in Part I, two important aspects of the WCB moisture cycle are investigated: the evaporative moisture sources and the relevance of WCBs for total and extreme precipitation. The most importantWCB moisture source regions are the western North Atlantic and North Pacific in boreal winter and the South Pacific and western South Atlantic in boreal summer. The strongest continental moisture source is South America. During winter, source locations are mostly local and over the ocean, and the associated surface evaporation occurs primarily during 5 days prior to the start of the WCB ascent. Long-range transport and continental moisture recycling are much more important in summer, when a substantial fraction of the evaporation occurs more than 10 days before the ascent. In many extratropical regions, WCBmoisture supply is related to anomalously strong surface evaporation, enforced by low relative humidity and high winds over the ocean. WCBs are highly relevant for total and extreme precipitation in many parts of the extratropics. For instance, the percentage of precipitation extremes directly associated with a WCB is higher than 70%-80% over southeastern North America, Japan, and large parts of southern South America.Aproper representation of WCBs in weather forecast and climate models is thus essential for the correct prediction of extreme precipitation events. © 2014 American Meteorological Society. 资助项目: SNSF, Swiss National Science Foundation
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51123
Appears in Collections: 气候变化事实与影响
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作者单位: Institute for Atmospheric and Climate Science, ETH Zurich, Zurich, Switzerland
Recommended Citation:
Pfahl S.,Madonna E.,Boettcher M.,et al. Warm conveyor belts in the ERA-Interim Dataset (1979-2010). Part II: Moisture origin and relevance for precipitation[J]. Journal of Climate,2014-01-01,27(1)