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Effects of Cloud Condensation Nuclei Concentration on Heavy Precipitation in Convection Permitting Simulations: Sensitivity to Cloud Microphysical Schemes

Author: DongZuo
Tutor: XuHaiMing；LuoYaLi
School: Nanjing University of Information Engineering
Course: Meteorology
Keywords: CCN concentration WRF model Cloud microphysics parameterization scheme Heavy rainfall
CLC: P426.51
Type: Master's thesis
Year: 2011
Downloads: 97
Quote: 0
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Abstract


Cloud condensation nuclei (CCN) The role of the atmospheric environment increasingly attention. Past, many of the studies on the CCN terms of climate impact studies, more research attention is now on CCN heavy precipitation process. WRF model simulations using an impact China's Guangdong Province, heavy rain squall line process, were selected Morrison, Thompson07, Thompson09 and WDM6 cloud microphysics scheme implemented four tests, each test consists of three different concentrations of CCN analog (\\The simulation area is divided into deep convection, shallow convective and stratiform regions, comparative analysis of four trials CCN concentration on the simulated total precipitation, precipitation rate in different regions and different regions of the area, and further comparative analysis of four sets of simulation experiments cloud microphysical processes, dynamic circulation strength by CCN concentration changes. Main conclusions: (1) using different simulated cloud microphysics scheme CCN-precipitation affect both similar and differences due to different cloud microphysical processes and CCN concentration has a direct or indirect contact between different cloud microphysical processes has complex association, cloud microphysical processes and power circulation nonlinear coupling exists between the different options hydrometeors spectral distribution between parameter settings, expressing the details of each process there is a difference. (2) adopt Thompson07 and Thompson09 programs CCN-precipitation is more significant impact, the impact of programs using WDM6 minimum, this difference and simulated CCN concentration on the dynamic circulation strength match. (3) four groups were simulated CCN concentrations appear to increase the delay precipitation generated initial precipitation weakened condition, in a simulated post-precipitation also decreases with increasing CCN concentration, while the mature stage squall line CCN-precipitation affect more complex, which is This stage of the process is stronger ice phase related. (4) All simulation test shallow convection zone deep convective and stratiform precipitation than the precipitation region of small three order of magnitude, but the area of ??shallow convection zone bigger than the other two regions, simulated time period when it accounted for the largest area a total area of ??more than 40%; four simulations have shown an area of ??shallow convection throughout the simulation period CCN concentrations were increased with the characteristics of the region because of shallow convective precipitation process is affected by warm rain process control, The CCN concentration inhibits cloud droplets to raindrops transformation process. (5) All four trials are governed by stratiform precipitation region CCN concentration increases the initial inhibition, Stratus area of ??the entire simulation period decreases with increasing concentration of CCN, which is also due to increase in CCN concentrations lead to decreased warm rain process .

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CLC: > Astronomy,Earth Sciences > Atmospheric science (meteorology ) > Meteorological elements,atmospheric phenomenon > Water vapor,condensation,and precipitation > Cloud > Cloud physics
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