RegCM3模式模拟我国春季气溶胶光学厚度及检验

利用区域气候模式RegCM3模拟了我国2005~2007年春季每月的气溶胶光学厚度及沙尘气溶胶光学厚度(AOD),并利用站点观测资料检验了模拟结果,探讨了沙尘气溶胶和人为活动排放气溶胶对春季AOD的贡献与影响.结果表明,模拟的我国春季AOD主要有3个高值区:南疆盆地和北疆部分地区,河西走廊地区,以及四川盆地和临近的中南部分地区.前两者AOD高值主要由沙尘气溶胶引起,后者主要受人为活动排放的气溶胶影响.观测资料检验表明模拟结果具有一定的可信度,模式对人类活动影响较少区站点的模拟效果优于对人类活动频繁区站点及城市和沿海站点的模拟,对城市和沿海站点的模拟结果偏低,对最偏远的阜康、海北、拉萨和西双版纳等站点的模拟结果与实际观测差别较大.

Simulation and validation of China’s spring aerosol optical depth by RegCM3

Spring monthly AOD and dust-AOD from 2005 to 2007 were simulated by RegCM3,and simulated results were validated by observational data.Meanwhile,the contribution and influence of dust-sand aerosol and human emission aerosol on spring AOD was discussed.The results show that there were mainly three high-value AOD areas in spring,which were southern Sinkiang Basin and parts of northern Sinkiang,Gansu Corridor,and Sichuan Basin with its adjacent parts of central south China,and the anterior two high-value areas primarily caused by dust-sand aeroso lin comparison with the last one mainly affected by human activities aerosol.Furthermore,the validation used by observational data showed that the simulation results were creditable,and it revealed the simulation was better for human activity infrequent sites than for human activity frequent sites,urban sites and coastal sites.As more,the simulation value was lower than observation at urban sites and coastal sites,and the AOD differences were greater between simulation and observation at the most remote sites,such as Fukang,Haibei,Lhasa and Xishuangbanna.