title: [Dust storms trend in the Capital Circle of China over the past 50 years and its correlation with temperature, precipitation and wind].
abstract: The trends of number of dust storm days of the selected 11 meteorological stations from their established year to 2000 as well as their correlations with temperature, precipitation and wind are revealed. The number of dust storm days of the Capital Circle of China is distinctly variable in space and time. The numbers of dust storm days of the western area are far more than those of the eastern area. The interannual variability of number of dust storm days is remarkable. The number of dust storm days of the following 7 stations, Erlianhaote, Abaga, Xilinhaote, Fengning, Zhangjiakou, Huailai and Beijing, declined along the past decades, but those of the other four stations had no significant upward or downward trends. There is a marked seasonality of the number of dust storm days, and the maximum was in April. The correlation between number of dust storm days and number of days of mean wind velocity > 5 m/s, which is critical wind velocity to entrain sand into the air, was strongest among the three climatic factor. There were significant positive correlations between the number of dust storm days and number of days of mean wind velocity > 5 m/s in 6 stations. The second strongest climatic factor correlated with the number of dust storm days is temperature. There are significant negative correlations between the number of dust storm days and mean annual temperature, mean winter temperature, mean spring temperature in 3 or 4 stations. The correlation between the number of dust storm days and precipitation is weakest. Only one station, Zhurihe, showes significant negative correlation between the number of dust storm days and spring rainfall. There are 4 stations whose number of dust storm days don't significantly correlate with the climate. In the end, the spatial-temporal variability of dust storms and its relation with climate in the Capital Circle of China were discussed thoroughly.
authors.affiliation: Institute of Geographical Sciences and Natural Resources Research, CAS, Beijing 100101, China. chenyf@igsnrr.ac.cn
authors.forename: Yu-fu
authors.initials: YF
authors.lastname: Chen
authors.forename: Hai-ping
authors.initials: HP
authors.lastname: Tang
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D002681:China; D004391:Dust / Q000032:analysis*; D010316:Particle Size; D011891:Rain; D012822:Silicon Dioxide / Q000032:analysis*; D013696:Temperature; D014887:Weather; D014919:Wind
chemical_list: D000393:Air Pollutants; D004391:Dust; D012822:Silicon Dioxide