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Received December 09, 2002,Revised January 02, 2003, Accepted , Available online

Volume 16,2004,Pages 187-190

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TOMS/AI data with nearly 20 years are utilized in the paper to evaluate dust activities in North China.Combined with simultaneous NCEP reanalysis climate data, climate effects on dust activities are assessed. Theresults showed that the whole North China suffers impact by dust aerosols, with three centers standing out in TOMS/AI spring average map that are western three basins, which are characterized by lower annual precipitationand elevation. Gobi deserts in Mongolia Plateau do not attain higher TOMS/AI value due to cloud contamination andrelative higher elevation. Spring is the season with the highest TOMS dust aerosol index; within the western threebasins, high dust aerosol index appears in both spring and summer, especially in Tarim Basin. Wind speed in springand precipitation in previous rainy season play important roles in controlling dust activities, higher wind speed andless precipitation than the normal are in favor of dust activities in spring. Temperature in spring and previous winteralso affect dust activity to a certain extent, but with contrary spatial distribution. Temperature in winter exert effectprincipally in west part, contrarily, temperature effect in spring is mainly shown in east part. Both of them havenegative correlation with dust activity.

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