内蒙古典型沙尘天气过程中风速廓线及PM_(10)的变化特征

Variation Characteristics of Wind Speed Profile and PM_(10) Concentration during Typical Dust Weather in Inner Mongolia

利用2005年1月至2006年4月朱日和地区20m气象塔的风速及PM10沙尘质量浓度资料,分析典型沙尘天气过程(沙尘暴、扬沙、浮尘)中近地层风速廓线及PM10的演变特征。结果表明,沙尘暴、扬沙发生发展过程中风速较大,梯度变化明显;浮尘天气风速相对较小,整个过程随时间均呈现出递增态势。沙尘天气结束后比开始前的风速均有所减小。沙尘暴期间PM10平均浓度在5436.38～10000μg/m3,扬沙天气发生过程中平均PM10质量浓度为1799.49～4006.06μg/m3,浮尘过程中PM10的平均质量浓度为1765.53μg/m3。

Based on the data of the wind speed and PM10 mass concentration at 20 m weather tower of Zhurihe Area from Jan of 2005 to Apr.of 2006,the evolvement characteristics of wind speed profile in near surface layer and PM10 in three representative dust weather processes（dust storm,blowing sand and floating dust）were analyzed.The results showed that wind speed was higher during dust storm and blowing sand with obvious vertical gradient.The speed in floating dust was relatively lower and increased during the whole process.In general,wind speed after dust weather was smaller with respect to that before the weather.The average mass concentrations PM10 in the process of dust storm,blowing sand and floating dust were in the ranges of 5 436.38-10 000,1 799.49-4 006.06 and 1 765.53 μg/m3,respectively.