CHENG Peng-wei,ZHOU Yun-jun,ZHANO Peng-guo,et al.A Comparative Study on Space-time Distribution Characteristics ofLightning Flashes in Beijing and Chengdu Cities[J].Journal of Chengdu University of Information Technology,2018,(03):326-334.[doi:10.16836/j.cnki.jcuit.2018.03.016]
北京与成都城市下垫面闪电时空分布特征对比研究
- Title:
- A Comparative Study on Space-time Distribution Characteristics ofLightning Flashes in Beijing and Chengdu Cities
- 文章编号:
- 2096-1618(2018)03-0326-09
- Keywords:
- atmospheric physics and atmospheric environment; atmospheric physics; cloud-to-ground lightning flashes; local urban heat island; temporal variation; spatial distribution
- 分类号:
- P427.32
- 文献标志码:
- A
- 摘要:
- 下垫面是造成闪电时空分布不均匀重要原因之一,了解不同下垫面闪电时空分布特征对雷电防护是一项十分重要的工作。选取不同纬度不同下垫面的北京市与成都市,利用北京市与成都市ADTD地闪定位资料、MODIS卫星资料、风云卫星资料,研究了两个典型城市下垫面地闪时空活动特征及其物理机制。地闪特征上北京市地闪电流强度及正地闪比例明显大于成都市。在时间尺度上,两市地闪变化呈现了不同的日变化特征。在地表覆盖类型上,北京市与成都市地闪主要分布在水体、农用地及植被区域等水汽条件较好区域上。在地形上,北京市与成都市地闪主要分布在山地平原交界带且相对海拔较低的地区,北京市与成都市地闪密度与海拔高度呈明显的负相关。北京市与成都市夜间地闪活动明显强于白天,且昼夜闪电时空分布与局地热岛强度空间分布有很好的响应。
- Abstract:
- The difference of underlying surface is one of the main reasons for the uneven spatial and temporal distribution of lightning, and it is a very crucial work for lightning protection to learn about the lightning temporal and spatial distribution features of different underlying surface. Beijing and Chengdu with different underlying surfaces at different latitudes were selected. According to ADTD flash location data, MODIS satellite data, wind and FY-2 Meteorologicalsatellite data of Beijing and Chengdu, the temporal and spatial characteristics of CG lightning flashes in two cities and its physical mechanism were studied. In terms of CG flashes characteristics, the intensity of lightning current and the percentage of positive CG flashes in Beijing are significantly larger than those in Chengdu. In terms of time scale, the CG flashes changes of the two cities show different diurnal variations. In terms of the type of underlying surface coverage, the ground flashover in Beijing and Chengdu is mainly distributed in areas with better water vapor conditions such as water bodies, agricultural land and vegetation areas. On the topography, the CG flashes in Beijing and Chengdu are mainly distributed in the junction of mountainous plains and in relatively low altitude areas. The density of CG flashes in Beijing and Chengdu decreased gradually with the elevation, and the density of CG flashes was significantly negatively correlated with the altitude.The nighttime CG flashes activities in Beijing and Chengdu were significantly stronger than those in daylight, and the temporal and spatial distributions of daytime and nighttime CG flashes had a good response to the spatial distribution of local urban heat island intensity.
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备注/Memo
收稿日期:2018-01-02基金项目:国家重点基础研究发展计划(973计划)资助项目(2014CB441401); 国家科技支撑计划资助项目(2015BAC03B00); 四川省教育厅资助项目(16CZ0021); 四川省教育厅科研资助项目(17ZB0087)