Preprints
https://doi.org/10.5194/acp-2022-162
https://doi.org/10.5194/acp-2022-162
 
24 Mar 2022
24 Mar 2022
Status: this preprint is currently under review for the journal ACP.

Estimation of surface ammonia concentrations and emissions in China from the polar-orbiting Infrared Atmospheric Sounding Interferometer and the FY-4A Geostationary Interferometric Infrared Sounder

Pu Liu1, Jia Ding1, Lei Liu1, Wen Xu2, and Xuejun Liu2 Pu Liu et al.
  • 1School of Earth and Environmental Sciences, Lanzhou University, Lanzhou, 730000, China
  • 2College of Resources and Environmental Sciences, Centre for Resources, Environment and Food Security, Key Lab of Plant Soil Interactions of MOE, China Agricultural University, Beijing 100193, China

Abstract. Ammonia (NH3) is the most important alkaline gas in the atmosphere, which has negative effects on biodiversity, ecosystems, soil acidification and human health. China has largest NH3 emissions in the world mainly associated with agricultural sources including nitrogen fertilizer and livestock. However, there is still a limited number of ground monitoring sites in China, hindering our understanding of both surface NH3 concentrations and emissions. In this study, using the polar-orbiting satellite (IASI) and Fengyun-4 geostationary satellite (GIIRS), we analyzed the changes of hourly NH3 concentrations, and estimated surface NH3 concentrations and NH3 emissions in China. GIIRS-derived NH3 concentration in daytime was generally higher than that at night, with high values during 8:00–18:00. Satellite-derived surface NH3 concentration was generally consistent with the ground observation data with R-square at 0.72–0.81 and slope equal to 1.03. Satellite-based NH3 emissions ranged from 12.99–17.77 Tg N yr-1 during 2008–2019. Spatially, high values of NH3 emissions mainly occurred in the North China Plain, Northeast China and Sichuan Basin, while low values were mainly distributed in western China (Qinghai-Tibet Plateau). Our study shows a high predictive power of using satellite data to estimate surface NH3 concentration and NH3 emissions over multiple temporal and spatial scales, which provide an important reference for understanding NH3 changes over China.

Pu Liu et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-162', Anonymous Referee #2, 11 Apr 2022
  • RC2: 'Comment on acp-2022-162', Anonymous Referee #1, 12 Apr 2022
  • RC3: 'Comment on acp-2022-162', Anonymous Referee #3, 12 Apr 2022

Pu Liu et al.

Pu Liu et al.

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Short summary
Ammonia (NH3) is the important alkaline gas and the key component of fine particulate matter. We used satellite-based observations to analyze the changes of hourly NH3 concentrations, and estimated surface NH3 concentrations and NH3 emissions in China. This study shows enormous potential of using satellite data to estimate surface NH3 concentrations and NH3 emissions, and provides an important reference for understanding NH3 variation in China.
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