中国3个AERONET站点气溶胶大小的识别及特征分析

?ngstr?m波长指数a是判断气溶胶粒子大小的重要参数,但当气溶胶尺度分布不满足Junge分布时,仅用a不能很好的反映气溶胶粒子的尺度信息.利用Mie散射理论和AERONET站点实测资料分析说明在0.750.6;当a2>0.3时,多以粗粒子为主,Vfine/Vtotal<0.4.利用Gobbi气溶胶图解法分析显示SACOL站AOD的大值主要是由于沙尘气溶胶的影响造成的;香河站沙尘和细粒子气溶胶都会产生大值AOD,并且图解法可以很好的区分这两种情况;太湖站受沙尘的影响较小,大值AOD绝大多数是由于细粒子气溶胶造成的.

Identify the size of aerosol particles and analyze its characteristic at three AERONET sites in China

?ngstr?m exponent a is an important indicator of the size of the aerosol particles. However, a alone does not provide unambiguous information on the relative weight of coarse and fine modes because the aerosol size distribution does not meet the Junge distribution in nature. We point out that the AOD spectral curvature can provide additional information about aerosol size distributions for 0.750.3indicate size distributions dominated by coarse mode aerosols. We test and apply the graphical method of Gobbi, and discriminate different aerosol types and quantify the contribution of them. The results show that the large values of AOD mainly are caused by the dust aerosols at SACOL site. The large values of AOD are caused by the dust aerosols or the fine aerosol particles and the graphical method of Gobbi can discriminate them at Xianghe site. Data from Taihu site confirmed the site is affected by fine mode aerosols. At Taihu site, pollution hazes what generates the large aerosol loads rather than dust aerosol.