Relationships among frequency of cold vortices, the number of dust-storm days in Mongolia, and yellow-sand events in Kyushu [Japan] in spring
2008
Yamamoto, N.(Tottori Univ. (Japan)) | Hayakawa, S.
This paper focused on synoptic disturbances, especially cold vortices as factors contributing to yellow sand in Japan. The frequency of cold vortices was closely related to yellow-sand events in Kyushu. The pressure distribution associated with a cold vortex might increase the number of yellow-sand events. The number of dust-storm days in Mongolia near the Gobi desert has increased rapidly since 1996 with increased strengthening of upper cold air including cold vortices. Strong upper cold air increases the temperature lapse rate, and the increased atmospheric instability resulted in dust storms. During La Nina, strong upper cold air was apt to be formed from the arid areas in China and Mongolia to Japan. In the spring 2006 La Nina, strong upper cold air passed over the Gobi desert many times. This might increase the number of dust-storm days in Mongolia.
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