西宁市典型污染日PM10输送规律研究

为研究西宁市PM₁₀的区域性污染特征，对2006年3月至2010年2月各季逐日大气污染指数（API，首要污染物为PM₁₀）进行统计分析。利用后向轨迹模型（HYSPLIT Model）对西宁市典型污染日（API > 200）中气团的后向轨迹进行模拟，研究PM₁₀的运动轨迹和区域性污染的可能来源。结果表明：西宁市一年中春季（集中于3月和4月）PM₁₀污染严重，与该季节气团对颗粒物的长距离输送有关。造成西宁市重污染状况的主要天气是风沙尘，北部和西北部的沙漠地区是主要风沙源；相邻城市PM₁₀污染峰值的提前与滞后，体现出区域性污染的传输过程。

Transportation characteristics of PM10 in the typical pollution weather in Xining

The daily API(PM10 is the primary pollutant) in the different seasons from March 2006 to February 2010 was analyzed for studying the regional pollution characteristics in Xining.The backward trajectory of air mass in the typical PM10 pollution days that API was more than 200 was simulated based on the trajectory model(HYSPLIT 4.9) in order to discuss the possible PM10 transportation path and the regional pollution source.The result showed that the serious PM10 pollution appears in spring,especially in March and April,which is related to the long-distance transportation of air mass to particulate matter.Sand dust contributes largely to the serious pollution weather in Xining,and its source is located in the desert of the northern and northwestern Xining.The early or deferred API peak value in adjacent cities reflects the transportation process of regional pollution.