气象2017，Vol.43Issue(1)：34-45,12.DOI:10.7519/j.issn.1000-0526.2017.01.004
雨滴谱谱形参数对梅雨降水模拟能力的影响
Effect of Shape Parameter of Raindrop Spectrum on the Simulation of Meiyu Rainfall
摘要
Abstract
Anstract:The raindrop spectrum shape parameter,which has significant spatio-temporal distribution fea-tures,is set as a constant in the Double-moment Bulk Microphysics Scheme (DBMS)using Gamma distri-bution function.Based on Milbrandt 2-mon (MY)DBMS,four Meiyu precipitation cases are simulated coupled with four empirical relationships between shape parameter (μr )and slope parameter of raindrops which are concluded from the observations of raindrop distribution.The analysis results suggest thatμr has some influences on precipitation.Adopting the diagnostic formulas ofμr is positively helpful for improving systematic biases of Meiyu rainfall and shows certain correction ability to the localization of rain-fall distribution.The good response of heavy precipitation toμr reflects the clear tendency of improve-ment.Calculated by the empirical formula,μr increases generally.In the mid- and lower-troposphere,μr decreases with the increase of rainfall intensity.The decline in raindrop water content and the increased raindrop mass-weighted average terminal velocity,which is directly related toμr ,are the direct causes for the changes of precipitation.The difference in improving degree between the light and heavy rainfalls mainly results from the different response features of their variable fields.The varying trend of warm-cloud particle features of severe rainfalls is consistent with that of light rainfalls,but there are considerable differences in their varying degrees.While it rains lightly,the response characteristics of physical fields toμr present similar varying trends and some linear features.However,in the case of heavy precipitation,the cloud microphysical process and ambient condition experience complex interactions with each other and no significant laws can be followed.关键词
微物理/谱形参数/雨滴谱/梅雨Key words
cloud microphysics/spectrum shape parameter/raindrop spectrum/Meiyu rainfall分类
天文与地球科学引用本文复制引用
梅海霞,郭文刚,周林义,李昕,黄小梅..雨滴谱谱形参数对梅雨降水模拟能力的影响[J].气象,2017,43(1):34-45,12.基金项目
江苏省气象局北极阁开放研究基金项目（BJG201606）、江苏省青年气象科研基金项目（Q201407和 Q201514）、江苏省气象局北极阁开放研究基金项目（BJG201304和BJG201408），以及国家自然科学基金面上项目（41375137）共同资助 （）
