南京地区闪电活动对气溶胶浓度变化的响应

发布时间：2018-04-21 08:54

本文选题：闪电密度 + 气溶胶　；参考：《电瓷避雷器》2016年06期

【摘要】：基于闪电卫星和地面观测资料、气溶胶光学厚度(aerosol optical depth,简称AOD)卫星观测资料,对南京地区闪电活动对气溶胶浓度变化的响应进行了分析。结果表明,夏季年平均闪电密度与夏季年平均AOD呈明显负相关(R=-0.634),与此同时,地面气温、对流有效位能(CAPE,convective available potential energy)及雷暴日与AOD均呈显著负相关(R=-0.748,-0.741,-0.744),表明南京地区,气溶胶可能通过辐射效应,致使地面温度降低,对流活动减弱,从而使得闪电活动降低。除此之外,南京地区夏季年平均正地闪比例(正地闪数占总地闪数的比例)随AOD呈一定的上升趋势,说明气溶胶可通过微物理效应,改变雷暴云中电荷结构分布,从而使得正地闪的产生概率增大。
[Abstract]:Based on the lightning satellite and ground observation data, the response of lightning activity to aerosol concentration in Nanjing area was analyzed by aerosol optical depth satellite data. The results show that there is a significant negative correlation between the annual lightning density in summer and the annual average AOD in summer. At the same time, the surface air temperature, convective available potential energy (CAPEE) and thunderstorm day are all negatively correlated with AOD. The aerosol may reduce the surface temperature and convection activity through radiation effect, thus reducing the lightning activity. In addition, the average annual positive lightning ratio (the proportion of positive ground lightning number to total ground flash number) in summer in Nanjing area shows an increasing trend with AOD, which indicates that aerosol can change the distribution of charge structure in thunderstorm cloud through microphysical effect. Thus, the probability of positive ground flicker is increased.
【作者单位】：南京信息工程大学气象灾害预报预警与评估协同创新中心;南京信息工程大学中国气象局气溶胶与云降水重点开放实验室;西藏阿里地区改则县气象局;
【基金】：国家重点基础研究发展计划项目(编号:2014CB441403) 国家自然基金项目(编号:41475006)
【分类号】：P427.3;X513

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