Influence of convection on the upper tropospheric O3 and NOx budget
in southeastern China
Zhang, X., Yin, Y., van der A, R., Eskes, H.,
van Geffen, J., Li, Y., Kuang, X., Lapierre, J. L., Chen, K., Zhen, Z.,
Hu, J., He, C., Chen, J., Shi, R., Zhang, J., Ye, X. and Chen, H.:
2022,
Atmos. Chem. Phys. 22, 5925-5942.
Abstract
Thunderstorms can significantly influence the air composition via strong
updraft and lightning nitrogen oxides (LNOx). In this study, the ozonesondes
and TROPOMI (TROPOspheric Monitoring Instrument) nitrogen dioxide (NO2)
observations for two cases are combined with a model to investigate the
effects of typical strong convection on vertical redistribution of air
pollutants in Nanjing, southeastern China. The ozonesonde observations show
higher O3 and water vapor mixing ratios in the upper troposphere (UT) after
convection, indicating the strong updraft transporting lower-level air
masses into the UT and the possible downward O3-rich air near the top of UT
over the convective period. During the whole convection life cycle, the UT
O3 production is driven by the chemistry (5-10 times the magnitude of
dynamic contribution) and reduced by the LNOx (-40%). Sensitivity tests
demonstrate that neglecting LNOx in standard TROPOMI NO2 products causes
overestimated air mass factors over fresh lightning regions and the opposite
for outflow and aged lightning areas. Therefore, a new high-resolution
retrieval algorithm is applied to estimate the LNOx production efficiency.
Our work shows the demand for high-resolution modeling and satellite
observations on LNOx emissions of both active and dissipated convection,
especially small-scale storms.
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created: 9 May 2022
last modified: 9 May 2022