Aerosol partitioning in natural mixed-phase clouds

Details Aerosol partitioning in natural mixed-phase clouds Aerosol partitioning in natural mixed-phase clouds

Mar 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3106101h&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 6, CiteID L06101

Physics

11

Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801), Atmospheric Composition And Structure: Cloud Physics And Chemistry, Global Change: Water Cycles (1836), Global Change: Atmosphere (0315, 0325), Meteorology And Atmospheric Dynamics: General Or Miscellaneous

Scientific paper

In situ aerosol and cloud drop microphysical measurements at a high-alpine site are used to investigate aerosol partitioning between cloud and interstitial phases in natural, mid-latitude, mixed-phase clouds. Measurements indicate a decrease in the activated aerosol fraction (FN) for particle diameters dP > 100 nm with cloud temperature from FN ~ 0.54 in summer liquid-phase clouds to FN ~ 0.08 in winter mixed-phase clouds. The latter may be attributed to the Bergeron-Findeisen mechanism whereby ice crystals grow at the expense of liquid water drops, releasing formerly activated aerosols back into the interstitial phase. This provides a means to distinguish the indirect effects of aerosols on drops and ice crystals.

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