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Estimation of Lightning-Generated NOx in the Mainland of China Based on Cloud-to-Ground Lightning Location Data

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Abstract

Lightning-generated nitrogen oxides (LNOx) have a major influence on the atmosphere and global climate change. Therefore, it is of great importance to obtain a more accurate estimation of LNOx. The aim of this study is to provide a reference for the accurate estimation of the total LNOx in the mainland of China based on cloud-to-ground lightning (CG) location data from 2014 to 2018. The energy of each CG flash was based on the number of return strokes per CG flash, the peak current of each return stroke, and the assumed CG breakdown voltage. The energy of intracloud lightning (IC) was based on the estimated frequencies of IC and the assumed energy of each IC flash. Combining the energy of lightning and the number of nitric oxide (NO) molecules produced by unit energy (ρno), the total LNOx production in the mainland of China was determined. The LNOx in the mainland of China estimated in this study is in the range (0.157–0.321) × 109 kg per year [Tg(N) yr−1], which is on the high end of other scholars’ works. Negative cloud-to-ground lightning (NCG) flashes produce the most moles of NOx, while positive cloud-to-ground lightning (PCG) flashes produce the least total moles of NOx. The breakdown voltage of PCG is greater than that of IC or NCG, while the latter has a greater output of LNOx.

摘 要

闪电产生氮氧化物(LNOx)对大气和全球气候变化具有重要影响, 因此, 得到更准确的LNOx估算具有重要意义. 利用2014~2018年地闪(CG)定位数据,旨在为准确估算中国大陆地区LNOx总量提供参考. 通过每个CG的回击次数、 每个回击的峰值电流和假设的地闪击穿电压得到每个地闪的能量. 估算云闪(IC)频次和假设每个云闪的能量得到云闪的总能量. 结合闪电能量和单位能量产生的一氧化氮(NO)分子数(ρno), 确定中国大陆地区LNOx的总产量. 中国大陆地区LNOx总产量为0.157 ~ 0.321×109 kg/年[Tg(N) yr−1], 位于其他学者的偏高一端. 负地闪(NCG)产生的氮氧化物(NOx)最多, 而正地闪(PCG)产生的NOx最少. 正地闪的击穿电压大于云闪或负地闪的, 但后者的NOx产量更大.

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Acknowledgements

This research was supported by the National Natural Science Foundation of China (Grant Nos. 91537209 and 91644224). We acknowledge the free use of cloud-to-ground locating data from China Meteorological Administration.

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Correspondence to Fengxia Guo.

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Article Highlights

• Based on cloud-to-ground lightning (CG) location data, the energy of each CG flash and the frequencies of intracloud lightning (IC) were estimated.

• The lightning-generated nitrogen oxides (LNOx) estimation for the mainland of China is between 0.157 Tg(N) yr−1 and 0.321 Tg(N) yr−1, which is on the high end of other studies.

• Compared to positive cloud-to-ground lightning, intracloud lightning and negative cloud-to-ground lightning have greater output of lightning-generated nitrogen oxides.

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Li, Q., Guo, F., Ju, X. et al. Estimation of Lightning-Generated NOx in the Mainland of China Based on Cloud-to-Ground Lightning Location Data. Adv. Atmos. Sci. 40, 129–143 (2023). https://doi.org/10.1007/s00376-022-1329-6

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  • DOI: https://doi.org/10.1007/s00376-022-1329-6

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