张伟 杨淑敏 周向玲*

根据1980~2012年喀什平原地区3个气象站的逐日气象资料,采用统计分析探讨了日平均温度、气温日较差、地温日较差、地-气温差、日平均风速、日平均气压、气压日较差及日相对湿度8个气象因子对浮尘天气变化的影响。结果表明:在年、月季节三个序列上,影响喀什平原地区浮尘天气发生的主要影响因子基本上是一致的,分别是日平均风速、日相对湿度、气温日较差、地-气温差及气压日较差5个因子。各因子对浮尘出现日数的影响有显著的季节差异,在春、秋、冬三季浮尘天气的发生受气温日较差和日相对湿度的影响显著;气温日较差越大,相对湿度越大,越不易发生浮尘天气。夏季动力因子占主导地位,日平均风速为主要因子。在秋、冬两季冷高气压对浮尘天气的发生有一定促进作用。

Impacting Factors of floating dust weather Variation onKashgar plains

Based on the daily weather observation data from 3 meteorological stations in Kashgar plains during the period from 1980 to 2012, this article analyses the influence of 8 meteorological factors such as daily mean temperature, daily range of temperature, daily range of ground temperature, land surface-atmosphere temperature difference, mean wind speed, daily mean pressure, daily range of pressure and relative humidity on floating dust weather using multinomial linear regression analysis. The results show that in annual series, monthly series and seasonal series, the main meteorological factors affecting floating dust weather in Kashgar plains are largely consistent, which are mean wind speed,relative humidity,land surface-atmosphere temperature difference,daily range of temperature and daily range of pressure. The influence of each factor on the days of occurring dusts have significant seasonal difference. In spring, autumn and winter,floating dust weather is significantly affected by daily range of temperature and relative humidity,the higher of the daily temperature and relative humidity,The more difficult it is to happen floating dust weather. In summer the dominant factors affecting the occurrence of floating dust weather is mean wind speed. Cold high pressure has a role in promoting the occurrence of dust weather in autumn and winter.