DOI: 10.1007/s00382-013-2025-0
Scopus记录号: 2-s2.0-84906097130
论文题名: A climatological analysis of Saharan cyclones
作者: Ammar K. ; El-Metwally M. ; Almazroui M. ; Abdel Wahab M.M.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2014
卷: 43, 期: 2017-01-02 起始页码: 483
结束页码: 501
语种: 英语
英文关键词: Climatology
; Saharan cyclones
; Tracks
英文摘要: In this study, the climatology of Saharan cyclones is presented in order to understand the Saharan climate, its variability and its changes. This climatology includes an analysis of seasonal and interannual variations, the identification and classification of cyclone tracks, and a presentation of their chief characteristics. The data used are drawn from the 1980-2009, 2.5° × 2.5°, NCEP/NCAR reanalysis (NNRP I) dataset. It is found that cyclone numbers increase in September-October-November (SON) at 4.9 cyclones per decade, while they decrease in June-July-August at 12.3 cyclones per decade. The identification algorithm constructed 562 tracks, which are categorized into 12 distinct clusters. Around 75 % of the Saharan cyclones originate south of the Atlas Mountains. The percentage of tracks that move over the Sahara is around 48 %. The eastern Mediterranean receives 27 % of the Saharan tracks, while the western basin receives only 17 and 8 % of all the Saharan cyclones decay over the Arabian Peninsula. The maximum cyclonic activity occurs in April. There is a general decrease in the number of tracks in all categories between 1993 and 2009, compared with the period between 1980 and 1992. About 72 % of the Saharan cyclones do not live more than 3 days, and about 80 % of the cyclones in the tracks never reach central pressures 1,000 hPa during their lifetimes. The maximum deepening in the tracks occurs over the western Mediterranean and over northern Algeria. © 2014 Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54479
Appears in Collections: 过去全球变化的重建
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作者单位: Center of Excellence for Climate Change Research, Meteorology Department, King Abdulaziz University, P. O. Box 80208, Jeddah, 21589, Saudi Arabia; Physics Department, Port Said University, Port Said, Egypt; Astronomy and Meteorology Department, Cairo University, Giza, Egypt
Recommended Citation:
Ammar K.,El-Metwally M.,Almazroui M.,et al. A climatological analysis of Saharan cyclones[J]. Climate Dynamics,2014-01-01,43(2017-01-02)