基于MODIS数据的地表覆盖种类与地闪分布特征关系研究

Relationship between Land Cover and Cloud-to-Ground Lightning Distribution Based on MODIS Data

利用2008—2013年MODIS 3级数据土地覆盖类型产品MCD12Q1及重庆市ADTD闪电定位资料,以重庆市内106°-107°E,29°-30°N范围的矩形区域为研究区域,结合频次、强度、时段、地貌等要素对局地内的地表覆盖种类与地闪分布关系进行了研究,结果表明：研究区内地闪分布在各地表覆盖种类上差异显著,在水域、农田、城镇上的闪电密度都高于平均值;地闪中轻中度闪电、强闪电的分布在同一地表覆盖种类上的差异明显,强闪电更易产生于水域、林地种类上;同一地表覆盖种类上地闪分布与季节的关系不明显;地闪活动在某些地表覆盖种类上的昼夜分布具有明显差异;植被覆盖面上的地闪分布与地貌条件关系密切,同一类覆盖面上的强闪电比例与海拔高度呈正相关关系。

Using the MODIS level-3 product MCD12Q1 and Chongqing ADTD lightning location information from 2008 to 2013,choosing the rectangular region between 106°-107°E,29°-30°N as the study area,combined with frequency,current intensity,time and landforms,the research is conducted on the relationship between the types of land cover and the distribution of cloud-to-ground lightning.The results show that the lightning distribution has significant difference in the study area corresponding various land-cover types;the lightning densities in waters,farmland and urban are higher than the average;the lightning distributions in mild-to-moderate and strong flashes have obvious difference;strong lightning occurs in waters and woodland more frequently;there is no marked relationship between land cover types and seasons;lightning distributions in day and night have obvious difference in some land covers;the lightning distribution is closely related to landforms in same land covers.