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© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  30 Jul 2020

30 Jul 2020

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This preprint is currently under review for the journal ACP.

Analysis of atmospheric ammonia over South and East Asia based on the MOZART-4 model and its comparison with satellite and surface observations

Pooja V. Pawar1, Sachin D. Ghude1, Chinmay Jena1, Andrea Móring2,7, Mark A. Sutton2, Santosh Kulkarni3, Deen Mani Lal1, Divya Surendran4, Martin Van Damme5, Lieven Clarisse5, Pierre-François Coheur5, Xuejun Liu6, Wen Xu6, Jize Jiang7, and Tapan Kumar Adhya8 Pooja V. Pawar et al.
  • 1Indian Institute of Tropical Meteorology (IITM), Pune, 411008, India
  • 2Centre for Ecology & Hydrology (CEH), Edinburgh, EH26 0QB, UK
  • 3Centre for Development of Advanced Computing, Pune, 411008, India
  • 4Indian Meteorological Department (IMD), Pune, 411005, India
  • 5Université libre de Bruxelles (ULB), Spectroscopy, Quantum Chemistry and Atmospheric Remote Sensing (SQUARES), Brussels, B-1050, Belgium
  • 6College of Resources and Environmental Sciences, National Academy of Agriculture Green Development, China Agricultural University, Beijing 100193, China
  • 7The University of Edinburgh, Scotland, EH8 9AB, UK
  • 8Kalinga Institute of Industrial Technology, Bhubaneshwar, 751016, India

Abstract. Limited availability of atmospheric ammonia (NH3) observations, limits our understanding of controls on its spatial and temporal variability and its interactions with ecosystems. Here we used the Model for Ozone and Related chemical Tracers (MOZART-4) global chemistry transport model and the Hemispheric Transport of Air Pollution version-2 (HTAP-v2) emission inventory to simulate global NH3 distribution for the year 2010. We present a first comparison of the model with monthly averaged satellite distributions and limited ground-based observations available across South Asia. The MOZART-4 simulations over South Asia and East Asia are evaluated with the NH3 retrievals obtained from the Infrared Atmospheric Sounding Interferometer (IASI) satellite and 69 ground based monitoring stations for air quality across South Asia, and 32 ground based monitoring stations from the Nationwide Nitrogen Deposition Monitoring Network (NNDMN) of China. We identify the northern region of India (Indo-Gangetic Plain, IGP) as a hotspot for NH3 in Asia, both using the model and satellite observations. In general, a close agreement was found between yearly-averaged NH3 total columns simulated by the model and IASI satellite measurements over the IGP, South Asia (r = 0.85) and North China Plain (NCP), of East Asia (r = 0.88). However, the MOZART-4 simulated NH3 column is substantially higher over South Asia than East Asia, as compared with the IASI retrievals, which show smaller differences. Model simulated surface NH3 concentrations indicate smaller concentrations in all seasons than surface NH3 measured by the ground based observations over South and East Asia, although uncertainties remain in the available surface NH3 measurements. Overall, the comparison of East Asia and South Asia using both MOZART-4 model and satellite observations showed smaller NH3 columns in East Asia compared with South Asia for comparable emissions, indicating rapid dissipation of NH3 due to secondary aerosol formation, which can be explained by larger emissions of acidic precursor gases in East Asia.

Pooja V. Pawar et al.

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Pooja V. Pawar et al.

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Short summary
In this study, simulations of atmospheric ammonia (NH3) with MOZART-4 model and HTAP-v2 emission inventory are compared with the satellite (IASI) and ground based measurements to understand the spatial and temporal variability of NH3 over two emission hot spots region of Asia, IGP and the NCP region. Our simulations indicate the formation of ammonium aerosols is quicker over NCP than IGP leading to smaller NH3 columns over higher NH3 emitting NCP compared to IGP region for comparable emissions.
In this study, simulations of atmospheric ammonia (NH3) with MOZART-4 model and HTAP-v2 emission...