DOI: 10.1002/joc.5742
论文题名: A climatology of the winter low-level jet over the Red Sea
作者: Samman A.E. ; Gallus W.A. ; Jr.
刊名: International Journal of Climatology
ISSN: 8998418
出版年: 2018
卷: 38, 期: 15 起始页码: 5505
结束页码: 5521
语种: 英语
英文关键词: Bab el Mandeb
; low-level jet
; moisture flux
; Red Sea
; Saudi Arabia
; winter precipitation
Scopus关键词: Climatology
; Sea level
; Bab el Mandeb
; Low level jet
; Moisture fluxes
; Red sea
; Saudi Arabia
; Winter precipitation
; Moisture
; advection
; jet stream
; moisture flux
; precipitation (climatology)
; wind velocity
; winter
; Indian Ocean
; Red Sea [Indian Ocean]
; Saudi Arabia
英文摘要: This study presents the first climatology of the low-level jet (LLJ) over the southern part of the Red Sea during the winter season. ERA-Interim pressure levels with 25 hPa vertical resolution were analysed for a 10-year period from 2006 to 2015. The jet was found to be a relatively frequent phenomenon, occurring on 37% of all 6-hr time steps in all 10 years in the south at 13.5°N and 43°E, decreasing to 15% of the data farther north at 19.5°N and 39°E. The core of the jet was usually close to the ground, with occurrence maximized at the 925 and 950 hPa levels corresponding roughly to 540–800 m above sea level. The study defined three criteria for the jet based on peak wind speeds. The jets that met the weaker criterion were frequent north of the straight of Bab el Mandeb in the far southern part of the Red Sea. The jets that met the two stronger criteria were more frequent further north approximately between 14°–17°N and 39°–42°E. Although the jet was present in the strait of Bab el Mandeb as found in earlier studies, the extension of the jet so much farther north suggests that other processes besides channelling must be acting to produce this jet. It also appears that the jet plays a significant role in moisture advection towards the central Red Sea region, which can contribute towards precipitation there as it was found that the moisture concentration increased in that region when the LLJ was present. It must be noted, however, that the present study relied upon reanalysis data to document the jet. Upper level observations in the region are scarce, so caution should be used in the interpretation of the results. © 2018 Royal Meteorological Society Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/116711
Appears in Collections: 气候减缓与适应
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作者单位: Department of Geological and Atmospheric Sciences, Iowa State University, Ames, IA, United States; Department of Meteorology, King Abdulaziz University, Jeddah, Saudi Arabia
Recommended Citation:
Samman A.E.,Gallus W.A.,Jr.. A climatology of the winter low-level jet over the Red Sea[J]. International Journal of Climatology,2018-01-01,38(15)