摘要
探讨了广义湿位涡理论及其倾向方程在暴雨落区预报方面的可应用性,为非均匀饱和广义湿位涡理论的业务应用提供了新的思路。资料诊断结果表明,非均匀饱和大气中的广义湿位涡虽然不具有守恒性,但由于其体现了实际大气的非均匀饱和特性,尤其是水汽梯度效应的引入,使得广义湿位涡的异常在对流层低层能比较清楚地反映出暴雨发生时期的高水汽集中的特性和机制,有效地反映出暴雨区以及暴雨落区的变化。
The authors discussed the possible application of generalized moist potential vorticity （GMPV） in non-uniformly saturated atmosphere and its tendency to location of torrential rain, which maybe provide a new thought for the operational application of the GMPV. The calculated results manifest that the GMPV is not a conservational variable, but it can reflects the non-uniformly saturated property in real atmosphere. Especially, the water vapor and its gradient effect can be manifested in the GMPV, which can indicate that the convergence mechanism of water vapor at lower levels and can reflect the characteristic and mechanism of high water vapor convergence when torrential rain occurs, and it would be used more widely to diagnose the structure and location of torrential rain systems in the future.
出处
《大气科学》
CSCD
北大核心
2007年第6期1301-1307,共7页
Chinese Journal of Atmospheric Sciences
基金
国家自然科学基金资助项目40505009
灾害天气国家重点实验室2006年开放课题2006LASW05
中国气象局武汉暴雨研究所暴雨开放基金项目IHR2006K01
中国科学院方向性项目KZCX3-SW-225
关键词
非均匀饱和
广义湿位涡
暴雨
non-uniformly saturated atmosphere, generalized moist potential vorticity, torrential rain
