DOI: 10.1002/jgrd.50179
论文题名: Identification and ranking of extraordinary rainfall events over Northwest Italy: The role of Atlantic moisture
作者: Pinto J.G. ; Ulbrich S. ; Parodi A. ; Rudari R. ; Boni G. ; Ulbrich U.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 5 起始页码: 2085
结束页码: 2097
语种: 英语
英文关键词: extreme events
; moisture advection
; rainfall annual maxima
; ranking
; Western Mediterranean
Scopus关键词: Advection
; Moisture
; Annual maxima
; Extreme events
; Moisture advection
; ranking
; Western Mediterranean
; Rain
; extreme event
; humidity
; identification method
; marine atmosphere
; moisture
; moisture transfer
; rainfall
; ranking
; time series
; weather station
; Atlantic Ocean
; Atlantic Ocean (North)
; Italy
; Mediterranean Sea
; Mediterranean Sea (West)
英文摘要: An objective identification and ranking of extraordinary rainfall events for Northwest Italy is established using time series of annual precipitation maxima for 1938-2002 at over 200 stations. Rainfall annual maxima are considered for five reference durations (1, 3, 6, 12, and 24 h). In a first step, a day is classified as an extraordinary rainfall day when a regional threshold calculated on the basis of a two-components extreme value distribution is exceeded for at least one of the stations. Second, a clustering procedure taking into account the different rainfall durations is applied to the identified 163 events. Third, a division into six clusters is chosen using Ward's distance criteria. It is found that two of these clusters include the seven strongest events as quantified from a newly developed measure of intensity which combines rainfall intensities and spatial extension. Two other clusters include the weakest 72% historical events. The obtained clusters are analyzed in terms of typical synoptic characteristics. The two top clusters are characterized by strong and persistent upper air troughs inducing not only moisture advection from the North Atlantic into the Western Mediterranean but also strong northward flow towards the southern Alpine ranges. Humidity transports from the North Atlantic are less important for the weaker clusters. We conclude that moisture advection from the North Atlantic plays a relevant role in the magnitude of the extraordinary events over Northwest Italy. © 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/63879
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Institute for Geophysics and Meteorology, University of Cologne, Kerpener Str. 13, 50923 Cologne, Germany; CIMA Research Foundation, Savona, Italy; Institute for Meteorology, Freie Universität Berlin, Berlin, Germany
Recommended Citation:
Pinto J.G.,Ulbrich S.,Parodi A.,et al. Identification and ranking of extraordinary rainfall events over Northwest Italy: The role of Atlantic moisture[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(5)