DOI: 10.1002/jgrd.50238
论文题名: Processes driving thunderstorms over the Agulhas Current
作者: De Boer A.M. ; Collier A.B. ; Caballero R.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 5 起始页码: 2220
结束页码: 2228
语种: 英语
英文关键词: Agulhas Current
; Lightning and storms
; Mid-latitude cyclones
; Western Boundary Currents
Scopus关键词: Lightning
; Sea level
; Agulhas current
; Climatic conditions
; Climatological winds
; Convective activity
; Oceanic regions
; Sea level pressure
; Western boundary currents
; Wind directions
; Thunderstorms
; atmospheric electricity
; data set
; lightning
; marine atmosphere
; seasonal variation
; seasonality
; thunderstorm
; warming
; western boundary current
; Agulhas Current
; Indian Ocean
英文摘要: Lightning occurs predominantly over land and is not common over the open ocean. We study here one oceanic region in which thunderstorms are frequently found, namely the warm Agulhas Current off the southeast coast of South Africa. The seasonal and interannual lightning variability is derived from satellite and terrestrial data sets. Favorable climatic conditions for lightning are investigated using both ERA-Interim and NCEP/NCAR reanalysis data. We find peak lightning in austral autumn over the Agulhas Current but with low seasonality (i.e., there is considerable lightning throughout the year). While the climatological wind direction varies strongly with latitude and season, the wind direction is predominantly northerly throughout the region during thunderstorms. A composite of sea level pressure during thunderstorm days indicates that thunderstorms are related to eastward-propagating synoptic-scale wave trains passing through the Agulhas Current region. The strong convective activity during thunderstorms occur in the warm sector of a cyclone and is associated with horizontal convergence and lifting of warm, moist surface air originating over the warm Agulhas Current. © 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/63871
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: Department of Geological Science, Stockholm University, 106 91 Stockholm, Sweden; Bert Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden; SANSA Space Science, Hermanus 7200, South Africa; School of Chemistry and Physics, University of KwaZulu-Natal, Durban 4000, South Africa; Department of Meteorology, Stockholm University, 106 91 Stockholm, Sweden
Recommended Citation:
De Boer A.M.,Collier A.B.,Caballero R.. Processes driving thunderstorms over the Agulhas Current[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(5)