Characteristics of Atmospheric Systems Accompany with Summer Dust over Northern Arabian Peninsula
Abstract: Summer dust cases over the northern Arabian Peninsula have been detected and classified using TOMS aerosol index data and synoptically analyzed using NCEP/NCAR reanalysis data. The dust cases have been detected using a threshold value of Aerosol Index, while the spread of grid points that achieved this threshold value has been used in the classification of classes. The selected cases indicated that most of the summer (82% of the period) are dusty, and Dust Raise type is the pronounced dust type observed through summer on surface stations inside the region. . The synoptic study of the summer dust and the non-dust cases demonstrated the presence of common features between these cases, and the produced summer dust not due to the atmospheric systems only, but to the relative positions of the these systems to each other. Although the synoptic surface and upper atmosphere features are generally similar on the dust and the non-dust cases, but it is found that the orientation of the upper trough, weakness of the upper maximum wind, deepening of the surface cyclone, and shifting eastward of the surface anticyclone are related to increases dust properties over the northern Arabian Peninsula. Further, the increase of static instability and rising motion are accompany with the dusty cases. Generally, these very small differences between the atmospheric features for the dusty and non-dusty cases approved that the summer season is potentially dusty and not need more than very small trigger from atmospheric mechanisms to be dusty.
[Adel M. Awad (2014); Characteristics of Atmospheric Systems Accompany with Summer Dust over Northern Arabian Peninsula Int. J. of Adv. Res. 2 (12). 0] (ISSN 2320-5407). www.journalijar.com
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