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Discussion papers
https://doi.org/10.5194/acp-2019-1197
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-1197
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 21 Jan 2020

Submitted as: research article | 21 Jan 2020

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This preprint is currently under review for the journal ACP.

MAX-DOAS measurements of NO2, SO2, HCHO and BrO at the Mt. Waliguan WMO/GAW global baseline station in the Tibetan Plateau

Jianzhong Ma1, Steffen Dörner2, Sebastian Donner2, Junli Jin3, Siyang Cheng1, Junrang Guo1, Zhanfeng Zhang4, Jianqiong Wang4, Peng Liu4, Guoqing Zhang4, Janis Pukite2, Johannes Lampel2,a, and Thomas Wagner2 Jianzhong Ma et al.
  • 1State Key Laboratory of Severe Weather & CMA Key Laboratory of Atmospheric Chemistry, Chinese Academy of Meteorological Sciences, Beijing, China
  • 2Max Planck Institute for Chemistry, Mainz, Germany
  • 3CMA Meteorological Observation Centre, Beijing, China
  • 4Waliguan Observatory, Qinghai Meteorological Bureau, Xining, China
  • anow at: Airyx GmbH, Eppelheim, Germany

Abstract. Mt. Waliguan Observatory (WLG) is a World Meteorological Organization (WMO)/Global Atmosphere Watch (GAW) global baseline station in China. WLG is located at the northeastern part of the Tibetan plateau (36°17' N, 100°54' E, 3816 m a.s.l.) and has a representativeness of the pristine atmosphere over the Eurasian continent. We made long-term ground-based MAX-DOAS measurements at WLG during the years 2012–2015. In this study, we retrieve the differential slant column densities (dSCDs) and estimate the tropospheric background mixing ratios of different trace gases, including NO2, SO2, HCHO and BrO, using the measured spectra at WLG. We find averaging of 10 original spectra to be an optimum option for reducing both the statistical error of the spectral retrieval and systematic errors in the analysis. We retrieve the dSCDs of NO2, SO2, HCHO and BrO from measured spectra at different elevation angles under clear sky and low aerosol load conditions at WLG. By performing radiative transfer simulations with the model TRACY-2, we establish approximate relationships between the trace gas dSCDs at 1° elevation angle and the corresponding average tropospheric background volume mixing ratios. Mixing ratios of these trace gases in the lower troposphere over WLG are estimated to be between about 5 ppt (winter) and 70 ppt (summer) for NO2, fall below 0.5 ppb for SO2, range between about 0.3 and 0.7 ppb for HCHO, and be close to ~ 0 ppt for BrO. Our study provides valuable information and data set for further investigating tropospheric background levels of these trace gases and their relationship to anthropogenic activities.

Jianzhong Ma et al.

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Short summary
We made ground-based MAX-DOAS measurements at the Mt. Waliguan WMO/GAW global baseline station (WLG) in the Tibetan Plateau during the years 2012–2015. We retrieve the differential slant column densities (dSCDs) of NO2, SO2, HCHO and BrO from measured spectra at different elevation angles. Mixing ratios of these trace gases in the background troposphere over WLG are derived based on these dSCDs at 1° elevation angle and the TRACY-2 radiative transfer model simulations.
We made ground-based MAX-DOAS measurements at the Mt. Waliguan WMO/GAW global baseline station...
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