【摘要】 在空气质量模式CMAQ中增加了对大气中苯并[a]芘(Ba P)传输、转化和沉降过程的模拟,新增了Ba P气相/颗粒相间分配模式(KOA吸收模式)以及Ba P化学转换,并采用该模型模拟了2014年1、4、7、10月四个季节代表月中国大气中Ba P的浓度以及干湿沉降通量的空间分布特征.模拟结果与部分地区的实测数据进行了初步对比验证,结果显示Ba P浓度的模拟值和测量值的量级基本一致,其比值基本在1~2个量级范围内,表明模拟结果处于可接受的范围.基于模型结果,还探讨了Ba P浓度与沉降季节变化特征与人为源排放的紧密联系,说明湿沉降是Ba P最主要的沉降途径.Ba P沉降的空间分布与其排放源和浓度具有密切的联系,并且具有长距离输送的特征等.更多还原

【Abstract】 The modules for simulating transport, transformation and deposition processes, as well as gas/particle partitioning(KOA absorption mechanism) processes of atmospheric Ba P was implemented into the CMAQ, a regional air quality model developed by U.S. E.P.A. The spatial distributions of Ba P concentrations, dry and wet deposition rates are simulated for January, April, July and October 2014 in China. The comparison between modeled and observed Ba P concentrations shows the predicted values were in an acceptable range. The predicted deposition results show that the wet deposition is the dominant deposition pathway. The spatial distributions of the Ba P depositions are closely related to that of the anthropogenic emissions and present obvious long-distance transportation characteristics.更多还原