摘要
统计分析了兰州周边地区6h内地闪闪区分布特征与200hPa高空急流、垂直风切变、高低空辐合辐散等环境风场以及K指数、条件对流性稳定度指数的关系,得到了地闪闪区与通气管指数分布的5种主要类别以及与高低空辐合辐散、稳定度指数分布的结构模型;指出了目前研究地闪频次与气象参数关系中存在的问题,通过分析不同时间或空间范围内的地闪频数与K指数的相关关系证实了这些问题的存在,建议在分析地闪频次和气象参数的关系时考虑选取有益的统计地闪次数的时间或空间范围。
By analyzing the distribution characteristic of cloud-to-ground discharge area during 6 hours,upper level jet stream at 200 hPa,vertical wind shear,convergence and divergence of upper or lower level,K index and Icondi-Conve index,the five main distribution types of cloud-to-ground discharge area and vent pipe index,the structural models of convergence and divergence of upper or lower level and stability parameters are found.The problems existing in recent researches on the relationship between cloud-to-ground discharge frequency and meteorological parameters are pointed out.The existence of these problems is confirmed by analyzing the relationship between cloud-to-ground discharge frequency and K index with varied time and area.The conclusion suggests that appropriate time and area should be selected in order to get more accurate result.
出处
《大气科学学报》
CSCD
北大核心
2010年第2期246-252,共7页
Transactions of Atmospheric Sciences
基金
江苏省气象灾害重点实验室资助项目(KLME050101
KLME050201)
国家自然科学基金资助项目(40775033
40975019)
公益性行业(气象)科研专项项目(GYHY(QX)200806009)
国家重点基础研究发展计划项目(2004CB418301
2009CB421503)
关键词
地闪分布
环境风场
稳定度
cloud-to-ground discharge distribution
environmental wind field
stability