DOI: 10.1002/joc.5164
论文题名: Seasonal variability and synoptic characteristics of dust cases over southwestern Saudi Arabia
作者: Mashat A.-W.S. ; Alamoudi A.O. ; Awad A.M. ; Assiri M.E.
刊名: International Journal of Climatology
ISSN: 8998418
出版年: 2018
卷: 38, 期: 1 起始页码: 105
结束页码: 124
语种: 英语
英文关键词: seasonal dust
; southwestern Saudi Arabia
; synoptic features
; TOMS aerosol index
Scopus关键词: Aerosols
; Meteorology
; Aerosol index
; National center for atmospheric researches
; National center for environmental predictions
; Saudi Arabia
; Seasonal compositions
; Statistical variability
; Synoptic features
; Total ozone mapping spectrometer
; Dust
; aerosol
; data set
; dust
; seasonal variation
; synoptic meteorology
; TOMS
; Arabian Peninsula
英文摘要: The synoptic characteristics and statistical variability of seasonal dust over southwestern Saudi Arabia are studied for the period from 1979 to 2006 using the aerosol index (AI) from the Total Ozone Mapping Spectrometer (TOMS) satellite, dust observations from surface stations, and meteorological data from the National Center for Environmental Prediction and the National Center for Atmospheric Research (NCEP/NCAR) reanalysis data set. The seasonal AI distribution indicates that approximately 80% of each year was dusty and that most of the dust occurred during hot months. In addition, the surface observations of the dust types show that the stations with the largest number of dust observations throughout the year were close to the desert, except during the summer, when the stations near the Red Sea had the largest number of dust observations. The synoptic forces that influenced the dust cases were the relative positions of high-pressure systems (Azores or Siberian) and low-pressure systems (Sudan or Indian), alongside their interactions. The relative positions of the atmospheric systems are highly pronounced at a pressure level of 850 hPa; at this pressure, the systems are oriented from north (anticyclonic system) to south (cyclonic system), turn anticlockwise to become oriented from west (anticyclonic system) to east (cyclonic system) during the summer, and then turn clockwise during the winter. Moreover, the interaction of the atmospheric systems influences the wind pattern of the seasonal composition over the southern Arabian Peninsula, which produces an anticyclonic wind pattern during winter, a cyclonic wind pattern during spring, a northerly/northwesterly wind pattern during summer and an anticyclonic wind pattern during autumn. The dust sources changed because of the relative positions of these atmospheric systems, in which the ‘Toker Gap’ Sudan was the summer/autumn dust source, and the ‘central and eastern’ Arabian Peninsula was the winter/spring dust source. © 2017 Royal Meteorological Society Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/117180
Appears in Collections: 气候减缓与适应
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作者单位: Department of Meteorology, King Abdulaziz University, Jeddah, Saudi Arabia
Recommended Citation:
Mashat A.-W.S.,Alamoudi A.O.,Awad A.M.,et al. Seasonal variability and synoptic characteristics of dust cases over southwestern Saudi Arabia[J]. International Journal of Climatology,2018-01-01,38(1)