Experimental determination of the deposition coefficient of small cirrus-like ice crystals near -50°C

Details Experimental determination of the deposition coefficient of small cirrus-like ice crystals near -50°C Experimental determination of the deposition coefficient of small cirrus-like ice crystals near -50°C

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3317813m&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 17, CiteID L17813

Physics

20

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

Scientific paper

Several small ice particles were observed to grow and evaporate in a quadrupole electrodynamic levitation cell at temperatures between -40 and -60°C and variable supersaturation. The particle mass was traced throughout each experiment by analysis of the electrical (``springpoint'') boundaries for stable levitation. Measured growth of each particle was compared with that calculated from a standard particle-growth model. The small particle sizes and long durations of the experiments provided great sensitivity to the particle-mean deposition coefficient (αm). Suitable agreement between the measured and modeled growth histories was obtainable only upon using very small deposition coefficients: e.g., 0.0045 < αm < 0.0075, with αm ~ 0.006 being the most-likely value for a representative particle growing at -50°C. This finding of such low deposition coefficients suggests that cirrus-cloud simulations need to account for the strong influence that the surface-kinetic resistance exerts on the vapor growth of ice at atmospherically low temperatures.

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