层状云中冰晶繁生过程对降水影响的数值模拟  

NUMERICAL SIMULATION RESEARCHES ON THE EFFECT OF ICE CRYSTAL MULTIPLICATION ON STRATIFORM CLOUDS AND PRECIPITATION

作　　者：刘晓莉[1] 牛生杰[1] 

机构地区：[1]南京信息工程大学中美合作遥感中心,南京210044

出　　处：《气象科学》2007年第2期126-132,共7页Journal of the Meteorological Sciences

基　　金：国家自然科学基金项目(编号:40175003)资助

摘　　要：在层状云雨滴分档模式中加入冰晶繁生过程,研究繁生过程对层状云微物理结构及降水过程的影响。结果表明:模式云发展到190 min时,冰晶繁生过程发生,繁生层内的冰粒子浓度由10-3L-1增加到7.3 L-1,随后迅速减少,250 min后趋近于无繁生的情况;繁生层及其下方的云水含量较繁生前相同时刻减少约0.05-0.2 g.m-3;190 min,2 400-4 800 m高度层内的水汽含量急剧减少0.1-1.0 g.m-3;190-230 min,2 400-5 000 m高度层的冰水含量较考虑繁生过程之前增加0.1-0.6 g.m-3,240-250 min,2 400-4 000 m高度层内的冰水含量较繁生前相同时刻减少了0.1-0.3 g.m-3。加入繁生过程之后,雨强极大值增加1.8 mm.h-1(6.6%)。由此得出结论:(1)繁生过程发生后,云中瞬时冰晶浓度增加,繁生层下方的云水含量减少,冰水含量先增加后减少,水汽含量减少;(2)繁生过程使得雨强极大值增大。Ice crystal multiplication is added into rain category model developed by Guo Xueliang et al., the influences of multiplication on microphysical structure of stratiform clouds are studied. Results indicated that,multiplication occurred at 190 min,ice crystal concentration increased to 7.3 L^-1 from 10.3 L^-1, then decreased rapidly and became close to the condition without multiplication at 250 min, the maximum rain intensity increased and amounted to 1.8 mm·h^-1 （6.6%） ; during the 60 minutes after multiplication starting,cloud water content below multiplication layer decreased about to 0.05～0.2 g·m^-3 ; ice water content increased to 0.1～0.6 g·m^-3 at 190～230 min and then decreased to 0.1～0.3 g ·m^-3 at 240～250 min and nearly the same as the condition without multiplication after 250min; vapour content decreased to 0. 1～1g·m^-3 rapidly within 2400～4800 m altitude . The conclusion can be made as follows：

关 键 词：层状云 雨滴分档模式 冰晶繁生 

分 类 号：P462[天文地球—大气科学及气象学]