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Source apportionment of carbon monoxide over India: a quantitative analysis using MOZART-4

Abstract

MOZART-4 chemistry transport model has been used to examine the contribution of carbon monoxide (CO) from different source regions/types by tagging their emissions in model simulations. These simulations are made using tagged tracer approach to estimate the relative contribution of different geographical regions and different emission sources, such as anthropogenic or biomass burning to the CO concentration at the surface, in the planetary boundary layer (PBL), and in the free troposphere (FT) over the Indian sub-continent. The CO budget analyses highlight the significant contribution of the Indian emissions on surface CO and influence of chemical production on the free tropospheric CO concentration. The total CO mixing ratio is estimated as 263 ± 139 parts per billion by volume (ppbv) for surface, 177 ± 71 ppbv for PBL, and 112 ± 14 ppbv for FT. The percentage contributions of primary sources are found to be 80%, 68%, and 53% at the surface, in the PBL, and in the FT, respectively. The sub-regional analysis of India shows that anthropogenic and photochemical processes contribute 41–75% and 15–46% CO, respectively, at the surface. Maximum percentage contribution of anthropogenic CO is observed over Indo-Gangetic Plain and Eastern India (75%). CO contribution from local anthropogenic and biomass burning emissions and transported from other global source regions are analyzed over the Indian region at the surface, in the PBL, and in the FT. The local anthropogenic sources contribute largest to the surface CO over India with 108 ppbv, followed by China with 98 ppbv, Europe with 55 ppbv, North America (NA) with 46 ppbv, and South-east Asia (SEA) and Middle East (ME) with 23 ppbv each. India’s PBL (FT) CO is mostly influenced by China’s anthropogenic emissions with 12 ppbv (8 ppbv) followed by SEA with 7 ppbv (6 ppbv). Surface biomass burning CO over India (6 ppbv) is much lower than in other regions such as SEA (32 ppbv), Africa (24 ppbv), and South America (11 ppbv). In the PBL (FT), SEA and Africa’s BB emissions show major impact on CO over India with 6 ppbv (5 ppbv) and 5 ppbv (4 ppbv), respectively.

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Acknowledgments

We are thankful to Director IIRS and Dean IIRS for their help and support. We are very much thankful to two anonymous reviewers for their constructive comments and suggestions that have improved the quality of our paper substantially.

Availability of data and materials

The MOZART model simulations will be available upon request from the corresponding author.

Funding

The present research was funded by the ISRO-Geosphere Biosphere Program (IGBP) with grant number: E3Z1701TF505.

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Yesobu Yarragunta: Software, formal analysis, investigation, and writing (original draft). Shuchita Srivastava: conceptualization, visualization, resources, supervision, writing (review and editing), project administration, and funding acquisition. Debashis Mitra: Project administration, writing (review and editing), Harish Chandra Chandola: Supervision.

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Correspondence to Shuchita Srivastava.

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Yarragunta, Y., Srivastava, S., Mitra, D. et al. Source apportionment of carbon monoxide over India: a quantitative analysis using MOZART-4. Environ Sci Pollut Res 28, 8722–8742 (2021). https://doi.org/10.1007/s11356-020-11099-y

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  • DOI: https://doi.org/10.1007/s11356-020-11099-y

Keywords

  • Carbon monoxide
  • MOZART-4
  • Tagged tracer method
  • Source attribution
  • Indian sub-continent
  • Potential source regions