Timescale analysis of aerosol sensitivity during homogeneous freezing and implications for upper tropospheric water vapor budgets

Details Timescale analysis of aerosol sensitivity during homogeneous freezing and implications for upper tropospheric water vapor budgets Timescale analysis of aerosol sensitivity during homogeneous freezing and implications for upper tropospheric water vapor budgets

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3510809k&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 10, CiteID L10809

Physics

9

Atmospheric Processes: Clouds And Aerosols, Atmospheric Composition And Structure: Cloud Physics And Chemistry, Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906)

Scientific paper

Using timescales for the generation and depletion of water vapor, we predict aerosol sensitivity in clouds formed by homogeneous freezing. Our timescale analysis explains why aerosol sensitivity increases dramatically with ice deposition coefficients (α i) $\ll$ 0.1, and also why aerosol sensitivity increases as vertical velocity increases, temperature decreases, aerosol number decreases, and aerosol size decreases. We combine existing in-situ observations with adiabatic parcel modeling to constrain α i >= 0.1 for small ice crystals forming at high ice supersaturations. Two important implications for understanding and modeling upper tropospheric water vapor budgets emerge from our results: 1) aerosol sensitivity can be appreciable at low temperatures and moderate updrafts (~5 cm/s) in the upper tropical troposphere, 2) reconciling our results with recent laboratory measurements supports theory that α i increases with ice supersaturation and/or decreases with ice crystal size.

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