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| Preliminary Evaluation of a Model for Stratiform Cloud Microphysical Structure by Observation and Simulation |
| ZHAO Zhen,LEI Heng-Chi |
| Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 |
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Abstract The microphysical “three-layer” model for stratiform clouds over a midlatitude location in Northwest China is investigated by combining in situ airborne Particle Measuring Systems, Inc.(PMS), radar measurements, and the NCAR/Penn State Mesoscale Model Version 5 (MM5) simulation with a two-moment microphysics scheme. The coexistence of measured supercooled liquid water and small ice particles produces snow particles below the cloud top in the second layer. Peak number concentration and mean diameter of cloud water and raindrop appear in the third warm layer. A thin dry layer just below the melting layer is also observed. The predicted precipitation is tested by equitable threat score. The melting layer is clearly defined in the radar image and model radar reflectivity output is agreement with the observations. The model results provide features of the microphysical structure for every layer of “three-layer” model at Yan’an station. For both observation and model simulation, the “three-layer” model explains the stratiform precipitation formation completely and comprehensively.
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Received: 22 April 2009
Revised: 08 May 2009
Accepted: 10 May 2009
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