Preprints
https://doi.org/10.5194/acp-2021-815
https://doi.org/10.5194/acp-2021-815

  25 Oct 2021

25 Oct 2021

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

MAX-DOAS observations of formaldehyde and nitrogen dioxide at three sites in Asia and comparison with the global chemistry transport model CHASER

Hossain M. S. Hoque1, Kengo Sudo1,2, Hitoshi Irie3, Alessandro Damiani3, and Al Mashroor Fatmi3 Hossain M. S. Hoque et al.
  • 1Graduate School of Environmental Studies, Nagoya University, Nagoya, 4640064, Japan
  • 2Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Kanagawa, 2370061, Japan
  • 3Center for Environmental Remote Sensing (CEReS), Chiba University, Chiba,2638522, Japan

Abstract. Formaldehyde (HCHO) and nitrogen dioxide (NO2) concentrations and profiles were retrieved from ground-based multi-axis differential optical absorption spectroscopy (MAX-DOAS) observation during January 2017 through December 2018 at three sites in Asia: (1) Phimai in Thailand (15.18° N, 102.5° E); (2) Pantnagar (29° N, 78.90° E) in the Indo Gangetic plain (IGP) in India; and (3) Chiba (35.62° N, 140.10° E) in Japan. The NO2 and HCHO partial columns (< 4 km) and profiles simulated using the global chemistry transport model (CTM) and CHASER were compared to those of MAX-DOAS. The vertical sensitivity of the datasets was elucidated using the averaging kernel (AK) information from the MAX-DOAS retrievals. The NO2 and HCHO concentrations at all three sites showed consistent seasonal variation throughout the investigated period. Biomass burning affected the HCHO and NO2 variation in Phimai during the dry season and in Pantnagar during spring (March–May) and the post-monsoon (September–November) season. High NO2 concentrations in Phimai during the wet season (June–September) are attributed to soil emissions of nitrogen oxides (NOx), confirmed from satellite observations and CHASER simulations. Comparison with CHASER shows that the seasonal variations in the HCHO and NO2 abundances at Phimai and Chiba agree well, with a correlation coefficient (R) of 0.80. Results agree with the variation, ranging mainly within the one sigma standard deviation of the observations. At Phimai, pyrogenic emissions contribute to the HCHO and NO2 concentrations up to ~50 and ~35 %, respectively. CHASER showed limited skills in reproducing the NO2 and HCHO variability at Pantnagar. However, the CHASER simulations in the IGP region agreed well with the reported results. Sensitivity studies showed that anthropogenic emissions affected the seasonal variation of NO2 and HCHO concentrations in the IGP region.

Hossain M. S. Hoque et al.

Status: open (until 06 Dec 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CC1: 'Comment on acp-2021-815', Vinod Kumar, 29 Oct 2021 reply
    • AC1: 'Reply on CC1', H.M.S. Hoque, 01 Nov 2021 reply
  • RC1: 'Comment on acp-2021-815', Anonymous Referee #1, 19 Nov 2021 reply
  • RC2: 'Comment on acp-2021-815', Anonymous Referee #2, 21 Nov 2021 reply

Hossain M. S. Hoque et al.

Hossain M. S. Hoque et al.

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Short summary
Nitrogen dioxide (NO2) and formaldehyde (HCHO) profiles, retrieved from remote sensing observations, are used to evaluate the global chemistry transport model CHASER. Overall, CHASER has demonstrated good skills in reproducing the seasonal climatology of NO2 and HCHO on a local scale at sites in South and East Asia. Around mountainous terrains, the model performs better on a regional scale. The improved spatial resolution of CHASER can likely reduce the observed discrepancies in the datasets.
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