Estimating the influence of lightning on upper tropospheric ozone using NLDN lightning data and CMAQ model
In: Atmospheric Environment, Jg. 67 (2013-03-01), S. 219-228
academicJournal
Zugriff:
Abstract: Lightning is a particularly significant NO x source in the middle and upper troposphere where it affects tropospheric chemistry and ozone. Because the version-4 Community Multiscale Air Quality Modeling System (CMAQ) does not account for NO x emission from lightning, it underpredicts NO x above the mixed layer. In this study, the National Lightning Detection Network™ (NLDN) lightning data are applied to the CMAQ model to simulate the influence of lightning-produced NO x (LNO x ) on upper tropospheric NO x and subsequent ozone concentration. Using reasonable values for salient parameters (detection efficiency ∼95%, cloud flash to ground flash ratio ∼3, LNO x production rate ∼500 mol N per flash), the NLDN ground flashes are converted into total lightning NO x amount and then vertically distributed on 39 CMAQ model layers according to a vertical-distribution profile of lightning N mass. This LNO x contributes 27% of the total NO x emission during 15 July ∼7 September 2006. This additional NO x reduces the low-bias of simulated tropospheric O3 columns with respect to OMI tropospheric O3 columns from 10 to 5%. Although the model prediction of ozone in upper troposphere improves by ∼20 ppbv due to lightning-produced NO x above the southeastern and eastern U.S.A., the improved ozone prediction is still ∼20–25 ppbv lower than ozonesonde measurements. [Copyright &y& Elsevier]
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Estimating the influence of lightning on upper tropospheric ozone using NLDN lightning data and CMAQ model
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Autor/in / Beteiligte Person: | Wang, Lihua ; Newchurch, M.J. ; Pour-Biazar, Arastoo ; Kuang, Shi ; Khan, Maudood ; Liu, Xiong ; Koshak, William ; Chance, Kelly |
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Zeitschrift: | Atmospheric Environment, Jg. 67 (2013-03-01), S. 219-228 |
Veröffentlichung: | 2013 |
Medientyp: | academicJournal |
ISSN: | 1352-2310 (print) |
DOI: | 10.1016/j.atmosenv.2012.11.001 |
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