沙尘源区与沉降区气溶胶粒子的理化特征

在沙尘源区 ,大气气溶胶粒子主要是地面沙尘来源 ,沙尘暴发生时气溶胶粒子的浓度大增 ,浓度峰值向粗粒径范围移动 ;在沙尘沉降区日本 ,当浮尘期时气溶胶粒子有地面沙尘和工业排放物两个来源 ,形成双峰型分布 ,当非浮尘期时气溶胶粒子主要以工业排放来源为主 ,在 <2 .1um细粒径范围形成一个峰值。水溶性成分也不相同 ,沙尘源区粒子以Ca2 +、SO42 -、Na+、Cl-等沙尘来源离子为主 ,在 3.3～ 4 .7um形成浓度峰值 ;沙尘沉降区以NH4+、SO42 -、NO3 -等工业来源离子为主 ,在 0 .6 5～ 1.0 1um形成峰值。在日本即使是当浮尘时期 ,大气中的气溶胶粒子浓度也远远比不上沙尘源区沙尘暴发生时的大气气溶胶浓度。这说明能够到达日本沉降区的气溶胶粒子只是沙尘源区大气气溶胶中的很少一部分

Physiochemical Properties of the Atmospheric Aerosol Particles over the Sand-dust Source Areas and Sedimentary Areas

Over the sand dust source areas, The changes of the concentration and the granular distribution characteristics of atmospheric aerosol at the different heights are not considerable whether during dust storm or the periods without dust storm, the peak values of the concentration of atmospheric aerosol particles shift towards the coarser particles during dust storm comparing with that during without dust storm; Over Wako of Japan, a sand dust sedimentary area, the curves of concentration distribution of atmospheric aerosol particles are bimodal during "Kosa" but unimodal during without "Kosa", the former reflects that the atmospheric aerosol particles come from two sources, I. E. the continental deposit and the local industrial discharge, and the latter reflects that the atmospheric aerosol particles come from the local industrial discharge only. Over the Japan during "Kosa" the concentration of atmospheric aerosol particles is much lower that of than the sand dust source areas during dust storm over the Japan. This shows that atmospheric aerosol particles of reaching over the Japan is a very less part of atmospheric aerosol particles over the sand dust source areas