Numerical study of the impact of cloud droplet spectral change on mesoscale precipitation |
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| Institution: | 1. Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, CMA Key Laboratory for Aerosol-Cloud-Precipitation, Nanjing University of Information Science & Technology, Nanjing 210044, China;2. School of Atmospheric Physics, Nanjing University of Information Science & Technology, Nanjing 210044, China;3. CMA Training Center, Beijing 100081, China;4. CMA Atmosphere Observation Test Bed, Beijing 100081, China;5. CMA Meteorological Observation Center, Beijing 100081, China;1. State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China;2. Key Laboratory of Environmental Change and Natural Disaster of Ministry of Education, Beijing Normal University, Beijing 100875, China;3. Academy of Disaster Reduction and Emergency Management, Ministry of Civil Affairs & Ministry of Education, Beijing Normal University, Beijing 100875, China;4. Regional Climate Group, Department of Earth Sciences, University of Gothenburg, Gothenburg 40530, Sweden;5. State Meteorological Agency, Delegation of the Balearic Islands, Palma de Mallorca, Spain |
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| Abstract: | The change of cloud droplet spectra can modify the microphysics and radiative processes of the atmosphere, which in turn affects surface precipitation. In this paper, the impact of cloud droplet spectral change (CDSC) on mesoscale precipitation is studied by simulating two cases, a South China Storm on June 8, 1998 and a Yangtze River Storm on July 22, 2002, and employing the MM5V3 with newly developed, dual-parameterized explicit moisture scheme coupled to. The results show that CDSC has a slight influence on rainfall distribution/pattern, but can significantly change the precipitation intensity, especially the position and intensity of the precipitation centers. The effects of CDSC are more distinct in the daytime and have an obvious diurnal cycle on rain rate. Precipitation increase (decrease) due to CDSC is ascribed to the relative upper radiative cooling (heating) and lower radiative heating (cooling) in the daytime atmosphere. |
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