Scavenging of atmospheric ions and aerosols by drifting snow in Antarctica

Details Scavenging of atmospheric ions and aerosols by drifting snow in Antarctica Scavenging of atmospheric ions and aerosols by drifting snow in Antarctica

2009-06-15

arxiv.org/abs/0906.2599v1

Atmospheric Research, 215-218, 2009

Physics

Atmospheric and Oceanic Physics

12 pages and 5figure

Scientific paper

10.1016/j.atmosres.2008.02.018

Measurements of the small,intermediate, and large ion concentrations and the airearth current density along with simultaneous measurements of the concentration and size-distribution of aerosol particles in the size ranges 4.4 to 163 nm and 0.5 to 20 micrometer diameters are reported for a drifting snow period after the occurrence of a blizzard at a coastal station, Maitri, Antarctica. Ion concentrations of all categories and the airearth current simultaneously decrease by approximately an order of magnitude as the wind speed increases from 5 to 10 meter per sec. The rate of decrease is the highest for large ions, lowest for small ions and in between the two for intermediate ions. Total aerosol number concentration decreases in the 4.4 to 163 nm size range but increases in 0.5 to 20 micrmetr size range with wind speed. Size distribution of the nanometer particles show a dominant maximum at 30 nm diameter throughout the period of observations and the height of the maximum decreases with wind speed. However, larger particles show a maximum at 0.7 micrometer diameter but the height of the maximum increases with increasing wind speed. The results are explained in terms of scavenging of atmospheric ions and aerosols by the drifting snow particles.

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