气象因子与锡林郭勒盟地区沙尘天气的关系

Relationship between Meteorological Factors and Sand-dust Weather in Xilinguole League Region

根据锡林郭勒盟地区1961—2012年降水量、温度、大风、沙尘暴等观测资料,分析了锡林郭勒盟地区沙尘暴与气象要素之间的关系,并初步讨论了下垫面因子与沙尘暴的关系。结果表明,锡林郭勒盟地区沙尘暴总体减少的原因是影响沙尘天气气象因子的变化。大风日数与沙尘暴日数的变化趋势非常吻合,具有一致性;年降水量与沙尘暴天气发生日数之间存在显著的负相关性,即降水对沙尘暴的发生具有一定的抑制作用;下垫面对锡林郭勒盟地区沙尘暴的发生有一定的影响,沙尘暴与土壤相对湿度之间存在明显的反相关关系,即下垫面条件对沙尘日数的变化有一定的作用。

According to observation data of precipitation, temperature, wind, sandstorm in 1961-2008 in Xilinguole League region, the relationship between sandstorm and meteorological factors in Xilinguole League region was analyzed, and the relationship between underlying factors and sandstorm was preliminary discussed.The results showed that the sandstorm in Xilinguole League region overall declined due to the effects of sand-dust weather meteorological fac- tors. The change trend of gale days and sandstorm days was fit perfectly and consistent. There was significant negative correlation between annual precipitation and sandstorm days,namely there were inhibitive effects of precipitation on sandstorm.Underlying surface in Xilin- guole League region had some impact on sandstorm,the anti correlation existed in sandstorm and relative soil humidity, namely underlying surface conditions would be helpful to the change of sand- dust days.