STUDIES OF FORMATION MECHANISM AND ORIGIN OF ACID SNOW PARTICLES

为了调查和验证降水过程中长距离输送所提供的化学成分，在1989年12月16日至1999年1月9日和1999年3月2日至18日的两个持续时间内，在离人为源足够远的Ny-Alesund进行了一些观测。采集了大量的固体降水颗粒物、气溶胶颗粒物和气体样品。在北极海冰区西北风作用下，无雾蒙蒙雪粒中SO 42-和NO3-浓度分别低于墨西哥湾流北端公海东南风作用下的雪粒中SO 42-和NO3-浓度。在无雾蒙蒙固体降水秋季环境大气中NO3-离子浓度的时间变化中，在粗气溶胶颗粒而不是HNO 3气体中观察到显著的凹陷。因此，可以认为，NO3-进入雪晶颗粒界面的过程是气溶胶清除过程，而不是气体的物理吸收过程。

To investigate and verify the chemical components provided by long range transportation with precipitation processes, some observations were carried out at Ny-Alesund as a sufficiently remote area from anthropogenic source for two durations of December 16, 1989 to January 9, 1999 and March 2 to 18, 1999. Amounts of samples had been collected about some samples of solid precipitation particles, aerosol particles and gases. Snow particles without riming were observed to contain less and more concentrations of SO42-andNO3-, respectively, by north westerly from arctic sea ice area than those with riming by south easterly from open sea in the north end of Gulf stream.In the temporal changes of concentration of NO3- ions in the environmetal atmosphere during fall of non-rimed solid precipitation, remarked depresions were remarked in coarse aerosol particles rather than HNO3 gas. Terefore, it may be considered that intake of NO3- to the interface of snow crystal particles take place more efficiently on the processes of aerosol scavenging mechanism than on that of physical absorption of gas.