Scavenging of insoluble particles from the marine atmosphere over the sub-Arctic North Pacific

Citation
M. Uematsu et al., Scavenging of insoluble particles from the marine atmosphere over the sub-Arctic North Pacific, J ATMOS CH, 35(2), 1999, pp. 151-164
Citations number
32
Categorie Soggetti
Environment/Ecology,"Earth Sciences
Journal title
JOURNAL OF ATMOSPHERIC CHEMISTRY
ISSN journal
01677764 → ACNP
Volume
35
Issue
2
Year of publication
1999
Pages
151 - 164
Database
ISI
SICI code
0167-7764(1999)35:2<151:SOIPFT>2.0.ZU;2-0
Abstract
Direct deposition measurements of atmospheric insoluble particles over the sub-Arctic North Pacific indicate that the number of particles (6.4 +/- 3.8 ) x 10(4) 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 e vent for 43 rain days during the period of March-September (total 109 days) 1996. This suggests that insoluble particles larger than 0.4 mu m in area equivalent diameter are primarily removed at the margin of the rainfall are a by wet scavenging processes below clouds in the marine atmosphere in sub- Arctic regions. The frequency of rain events controls the fate of the tropo spheric aerosols larger than sub-micrometer in diameter. Reflecting the sea sonal long-range transport of Asian dust, mineral particles were dominant a s insoluble particles in the spring rains, but carbonaceous particles were dominant in the summer rains. The atmospheric deposition of insoluble parti cles could be significant as a source of sediment particles over the sub-Ar ctic North Pacific.