半干旱区PM_(10)质量浓度时空分布特征研究

Spatio-Temporal Distribution of Mass Concentration of PM10 in Semiarid Area of China

利用内蒙古额济纳旗、乌拉特中旗、东胜、朱日和、锡林浩特和通辽6个观测站2005年的PM10质量浓度(MPM)和相关气象要素资料,分析了半干旱地区MPM的时空分布特征。结果表明,在春季,尤其是4月,各个观测站的MPM都会出现极大值;非沙尘日里,MPM在四季中的日变化主要呈现单峰分布,峰值出现时间从春季到冬季逐渐推迟。MPM最大值是反映各观测站沙尘天气强度的主要因子;气象影响指数(IPM)与MPM的相关系数大于0.5。

The spatial and temporal distribution characteristics of MpM in semiarid area of China are analyzed based on observations of mass concentration of PM10 （MPM） and relevant meteorological elements at six national climate observation stations in Inner Mongolia of China in 2005. The results show that the maximum MPM Of each observation stations all occurred in spring（April）. The diurnal variation of MPM show an unimodal curve during the non-dusty days, and the appearing time of the maximum value is postponed from spring to winter. The maximum value of MPM is a main factor reflecting the intensity of dust weather, and the correlation coefficient between the climate condition index （MPM） and MPM is greater than 0.5.