摘要:为了进一步了解青藏高原闪电的产生氮氧化物（LNOx）经由光化学反应对O3浓度变化及夏季O3低谷形成的可能影响，本文利用2005~2013年由OMI卫星得到的对流层NO2垂直浓度柱（NO2 VCD）、O3总浓度柱（TOC）和O3廓线以及星载光学瞬变探测器OTD和闪电成像仪LIS获取的总闪电数资料，对青藏高原和同纬度长江中下游地区的TOC和NO2 VCD月均值时空分布特征、闪电与NO2 VCD的相关性和O3的垂直分布特征及其与LNOx的关系进行了对比分析。结果表明，青藏高原的O3低谷主要出现在夏季和秋季，其TOC值比同纬度长江中下游地区低约10~15 DU（Dobson unit）。青藏高原NO2VCD总体较小，表现为夏高冬低的分布特征。青藏高原夏季O3浓度受南亚高压的影响总体呈减小趋势，但因强雷暴天气导致对流层中上部LNOx浓度升高，并随强上升气流向对流层顶输送，同时通过光化学反应使O3浓度增加，缩小了青藏高原和同纬度地区的O3浓度差，减缓了O3总浓度的下降，抑制了夏季O3低谷的进一步深化。
关键词:O3/
NO2/
青藏高原
Abstract:In order to further study possible influences of the photocatalytic reaction on the formation of O3 and O3 valley in the summer over the Tibetan Plateau, NO2 VCD, O3 total column and O3 profiles from OMI and OTD (Optics Transient Detection)/LIS (Lightning Imaging Sensor) total lightning data are used to investigate the spatial and temporal distributions characteristics of TOC and NO2 VCD, the correlation between lightning and NO2 VCD, the vertical distribution of O3 and its relationship with LNOx in the Tibetan Plateau and the Yangtze River Delta. Results in the two regions, which are located at the similar latitudes, are compared and analyzed. It is found that the O3 valley over the Tibetan Plateau mainly appears in the summer and autumn, and its TOC value is about 10-15 DU (Dobson unit) lower than that over the Yangtze River Delta. The NO2 VCD over the Tibetan Plateau is relatively small, and exhibits a temporal distribution characteristic of low in the summer and high in the winter. The total concentration of O3 in the Tibetan Plateau generally decreases in the summer due to the effect of the South Asia high. However, due to the influence of strong thunderstorms, the concentration of LNOx in the upper troposphere increases and can be transported to the top of the troposphere by strong ascending flows, which subsequently increases the concentration of O3 by photochemical reaction. Thereby, the O3 concentration difference between the Tibetan Plateau and the same latitude region is reduced and the decrease of the total O3 concentration slows down, which inhibits further deepening of the O3 valley in the Tibetan Plateau in the summer.
Key words:O3/
NO2/
Tibetan Plateau
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