8A.2 Estimates of Lightning NOx Production Based on High-Resolution OMI NO2 Retrievals over the Continental United States

Wednesday, 15 January 2020: 8:45 AM
206B (Boston Convention and Exhibition Center)
Xin Zhang, Nanjing Univ. of Information Science and Technology, Nanjing, China; and Y. Yin, R. Van Der A, and J. Lapierre

Handout (3.2 MB)

Lightning is an important source of nitrogen oxides (NOx = NO + NO2 ) in the upper troposphere, with strong impact on ozone and the hydroxyl radical production. However, the production efficiency (PE) of lightning nitrogen oxides (LNOx) is still quite uncertain (32 — 1100 mol NO per flash). Satellites measurements are a powerful tool to estimate LNOx directly as compared to conventional platforms. To apply satellite data without geographic restrictions, a new algorithm for calculating LNOx has been developed based on the new Berkeley High Resolution (BEHR) v3.0B NO2 and the Weather Research and Forecasting-Chemistry (WRF-Chem) model. We estimate LNOx PE over the continental US using the NO2 product of the Ozone Monitoring Instrument (OMI) satellite and the Earth Networks Total Lightning Network (ENTLN) data. Focusing on the summer season during 2014, we find that lightning NO2 (LNO2) PE is 29 ± 14 mol NO2 flash-1 and 8 ± 4 mol NO2 stroke-1 while LNOx PE is 79 ± 38 mol NOx flash-1 and 22 ± 12 mol NOx stroke-1. Results reveal that former methods are more sensitive to background NO2 and neglect many below-cloud LNO2. As the LNOx parameterization varies in studies, we evaluate the sensitivity of our calculations to the setting of LNO amounts.

Supplementary URL: https://github.com/zxdawn/BEHR-LNOx

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