中国区域闪电特征分析及闪电产生NOx量的估算

利用中国2008-2010年的闪电定位数据，分析了闪电次数的空间分布和时间变化，结合Price理论，估算了闪电产生的氮氧化物（LNOx）量，初步分析了LNOx的时空分布特征。结果表明：闪电的高发期为7、8月，广州、武汉为闪电高发区；LNOx主要分布在（105～125°E，25～40°N）地区，其中武汉、广州、成都、重庆、长沙、南京和南昌地区量值较大；7月和8月LNOx的产量明显高于其他几个月，8月产量最高；此外，LNOx的分布具有明显的季节特征，春夏秋冬四季产量分别占总产量的4．8％、89．4％、5．3％以及0．5％，春季的LNOx主要出现在广州地区，夏季LNOx高值区分布北移，分布范围较广；秋季分布范围减小，最大值出现在广州地区，冬季产量明显变小，最大值出现在武汉的西南方向。

Analysis of the features of lightning in China and estimation of lightning-produced NOx

In this paper, we analyzed the spatial distribution and temporal variance of lightning frequen-cy by using lightning positioning data in China during 2008 and 2010. Based on Price＇s theory, we esti-mated the quantity of NOx emission produced by lightning （LNOx） and preliminarily analyzed the temporal and spatial distribution of LNOx. The results showed that lightning occurred more frequently in July and August and mainly in Guangzhou and Wuhan. LNOx was mainly distributed in the area of 25-40°N and 105-125°E. The quantity of LNOx in Wuhan, Guangzhou, Chengdu, Chongqing, Chan- gsha,Nanjing and Nanchang are higher than that in other regions, and the maximum could reach up to 1.23 × 10^7g each grid. August saw the highest yield while the second highest was July. Furthermore, the seasonal characteristics of LNOx distribution were obviously, and the percentages in spring, summer, au-tumn and winter were 4. 8% ,89.4% ,5.3% and 0. 5% respectively. LNOx mainly appeared in Guang-zhou area in spring while in summer it moved northward and became wide and strong. The distribution area decreased in autumn and the maximum occurred in Guangzhou. In winter, the quantity of LNOx decreased significantly with its maximum appearing in the southwest of Wuhan.