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- Title
Scavenging of insoluble particles from the marine atmosphere over the sub-Arctic North Pacific
- Authors
Kinoshita, Katsumoto; Nojiri, Yukihiro; Uematsu, Mitsuo
- Abstract
Direct deposition measurements of atmospheric insoluble particles over the sub-Arctic North Pacific indicate that the number of particles(6.4 1 3.8) x 104 cm-2 per rain event was fairly constant compared with the large variation of the precipitation rate, which ranged from 0.16 to 18 mm per event for 43 rain days duringthe period of March-September (total 109 days) 1996. This suggests that insoluble particles larger than 0.4 mm in area equivalent diameter are primarily removed at the margin of the rainfall area by wet scavenging processes below clouds in the marine atmosphere in sub-Arcticregions. The frequency of rain events controls the fate of the tropospheric aerosols larger than sub-micrometer in diameter. Reflecting the seasonal long-range transport of Asian dust, mineral particles were dominant as insoluble particles in the spring rains, but carbonaceous particles were dominant in the summer rains. The atmospheric deposition of insoluble particles could be significant as a source of sediment particles over the sub-Arctic North Pacific.
- Subjects
ATMOSPHERIC chemistry; ATMOSPHERIC deposition; METEOROLOGICAL precipitation; SCANNING electron microscopy; PARTICLE size distribution
- Publication
Journal of Atmospheric Chemistry, 2000, Vol 35, Issue 2, p151
- ISSN
0167-7764
- Publication type
Article