Observation of Aerosol Scavenging by Falling Snow Crystals at Two Sites of Different Heights
Observation of Aerosol Scavenging by Falling Snow Crystals at Two Sites of Different Heights
复制标题
两个不同高度地点落下的雪晶清除气溶胶的观测
DOI：
10.2151/jmsj1965.59.5_763
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发表时间：
1981
影响因子：
3.1
通讯作者：
C. Magono
中科院分区：
文献类型：
--
作者：
M. Murakami;Chikashi Hiramatsu;C. Magono
在札幌和山顶同时观测了大气中的气溶胶浓度和附着在落下的雪晶上的气溶胶粒子数。1978年3月，泰内（1，024米）。结果发现，附着在札幌雪晶上的气溶胶粒子数量比Mt.泰恩这表明，雪晶在秋季收集了札幌上空的气溶胶颗粒。根据在札幌获得的观测数据计算了雪晶对气溶胶粒子的收集效率。有边雪晶的收集效率比无边雪晶高出一个数量级左右。空气动力学效应和雨停效应可能归因于这种巨大的差异。对于直径从0.4到10 *m的较大气溶胶颗粒，发现无边缘雪晶的收集效率随着气溶胶尺寸的增加而增加，并且范围从1*10-3到6*10-2。这些值与其他工作者的实验结果几乎一致。对于直径小于0.1*m的气溶胶颗粒，收集效率粗略估计为1*10-2。
The aerosol concentration in the atmosphere and the number of aerosol particles attached to falling snow crystals were simultaneously observed in Sapporo and at the summit of Mt. Teine (1,024 m) in March 1978. As a result, it was found that the number of aerosol particles attached to snow crystals in Sapporo was about one order greater than at the summit of Mt. Teine. This shows that the snow crystals collected the airborne aerosol particles over Sapporo during their fall. The collection efficiency of aerosol particles by snow crystals was calculated on the basis of the observational data obtained in Sapporo. The collection efficiency by rimed snow crystals was about one order greater than that by the unrimed snow crystals. The aerodynamic effect and rain-out effect may be attributed to this large difference. As for larger aerosol particles from 0.4 to 10 *m in diameter, it was found that the collection efficiency by the unrimed snow crystals increased with the increasing aerosol size, and ranged from 1*10-3 to 6*10-2. These values are almost in agreement with those experimentally obtained by other workers. As for aerosol particles smaller than 0.1*m in diameter, the collection efficiency was roughly estimated to be 1*10-2.