Preprints
https://doi.org/10.5194/acp-2021-650
https://doi.org/10.5194/acp-2021-650

  17 Nov 2021

17 Nov 2021

Review status: this preprint is currently under review for the journal ACP.

Influence of convection on the upper tropospheric O3 and NOx budget in southeastern China

Xin Zhang1,2, Yan Yin1,2, Ronald van der A2,3, Henk Eskes3, Jos van Geffen3, Yunyao Li4, Xiang Kuang1,2, Jeff L. Lapierre5, Kui Chen1,2, Zhongxiu Zhen1,2, Jianlin Hu1,2, Chuan He1,2, Jinghua Chen1,2, Rulin Shi6, Jun Zhang7, Xingrong Ye7, and Hao Chen7 Xin Zhang et al.
  • 1Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science and Technology (NUIST), Nanjing 210044, China
  • 2Department of Atmospheric Physics, Nanjing University of Information Science and Technology (NUIST), Nanjing 210044, China
  • 3Royal Netherlands Meteorological Institute (KNMI), Department of Satellite Observations, De Bilt, the Netherlands
  • 4Department of Atmospheric, Oceanic & Earth Sciences, George Mason University, Fairfax, VA, USA
  • 5Earth Networks, Germantown, Maryland, USA
  • 6Inner Mongolia Lightning Warning and Protection Center, Hohhot, 010051, China
  • 7Nanjing National Reference Climatological Station, Nanjing 210044, China

Abstract. Thunderstorms can significantly influence the air composition via strong updraft and lightning nitrogen oxides (LNOx). In this study, the ozonesondes and TROPOMI nitrogen dioxide (NO2) observations for two cases are combined with 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 airmass 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 (> 87 %) 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.

Xin Zhang et al.

Status: open (until 29 Dec 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Xin Zhang et al.

Data sets

Xin_ACP_2021_Convection_Effect_data Xin Zhang https://doi.org/10.5281/zenodo.5154798

Model code and software

WRF-Chem-LDA-LFR Xin Zhang, Yunyao Li https://doi.org/10.5281/zenodo.4682331

zxdawn/Xin_ACP_2021_Convection_Effect Xin Zhang https://doi.org/10.5281/zenodo.4945560

S5P-WRFChem Xin Zhang https://doi.org/10.5281/zenodo.4682636

Xin Zhang et al.

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Short summary
The importance of convection to the ozone and nitrogen oxides (NOx) produced from lightning has been a long-time open question. We utilize the high-resolution chemistry model with ozonesondes and space observations to discuss the effects of convection over southeastern China, where few studies have been conducted. Our results show the transport and chemistry contributions for various storms and convince the ability of TROPOMI to estimate the lightning NOx production over small-scale convection.
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