خرائط توزيع الأمطار السعودية
لعام 2008
Figure 1: Map of Saudi Arabia showing the distribution of annual rainfall for a 50 year period (1950-2000) based on rain gauge observations. The circulations indicate the location radar observations winter study (November – May) in the central region and for the summer study in the southwestern region (June – September).
Figure 2: Map of rainfall observed by satellite (TRMM 3B43 product) over Saudi Arabia for a ten year period of January 1998 – January 2008. The rainfall pattern matches well with the long-term precipitation climatology shown in Figure 1.
Saudi Arabia
Using observations collected from two weather radar networks (see Figure 1 for the location of the seven radars in the two networks) and research aircraft, RAL scientists have gathered information that substantially aids in our understanding of the climatology of Saudi Arabia, as well as characterizing the variability of precipitating storms. The climatological distribution of annual rainfall observed by rain gauges across Saudi Arabia is shown in Figure 1 and 10-year climatology observed by satellite is shown in Figure 2. Dryness is the prevailing climatic characteristic of Saudi Arabia except in the Asir region (centered on Abha in Figure 1), which receives annual rainfall > 300 mm due to its unique geographical configuration and the local mountains, and a secondary peak located in northeast, which is associated with winter precipitation. Rainfall in most of Saudi Arabia is < 200 mm, highly irregular (i.e., large natural variability), and hence is not dependable. Analyses of the field data has continued into FY08. A second year of more extensive field studies of air chemistry, aerosol, cloud microphysics, precipitation, and storm characteristics was conducted for the period of December 2007 – May 2008 in the central region and June – September 2008 in the southwest (Asir) region of Saudi Arabia.
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تحياتي