Evaluation of a new mixed-phase cloud microphysics parameterization with CAM3 single-column model and M-PACE observations

Details Evaluation of a new mixed-phase cloud microphysics parameterization with CAM3 single-column model and M-PACE observations Evaluation of a new mixed-phase cloud microphysics parameterization with CAM3 single-column model and M-PACE observations

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3423712l&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 23, CiteID L23712

Physics

9

Atmospheric Processes: Clouds And Cloud Feedbacks, Atmospheric Processes: Clouds And Aerosols, Atmospheric Processes: Global Climate Models (1626, 4928), Atmospheric Composition And Structure: Cloud/Radiation Interaction

Scientific paper

Most global climate models generally prescribe the partitioning of condensed water into cloud droplets and cloud ice in mixed-phase clouds according to a temperature-dependent function, which affects modeled cloud phase, cloud lifetime and radiative properties. This study evaluates a new mixed-phase cloud microphysics parameterization (for ice nucleation and water vapor deposition) against the Atmospheric Radiation Measurement (ARM) Mixed-phase Arctic Cloud Experiment (M-PACE) observations using the NCAR Community Atmospheric Model Version 3 (CAM3) single column model (SCAM). It is shown that SCAM with the new scheme produces a more realistic simulation of the cloud phase structure and the partitioning of condensed water into liquid droplets against observations during the M-PACE than the standard SCAM. A sensitivity test indicates that ice number concentration could play an important role in the simulated mixed-phase cloud microphysics, and therefore needs to be realistically represented in global climate models.

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