Preprints
https://doi.org/10.5194/acp-2022-555
https://doi.org/10.5194/acp-2022-555
19 Sep 2022
 | 19 Sep 2022
Status: a revised version of this preprint was accepted for the journal ACP and is expected to appear here in due course.

Satellite (GOSAT-2 CAI-2) retrieval and surface (ARFINET) observations of Aerosol Black Carbon over India

Mukunda M. Gogoi, S. Suresh Babu, Ryoichi Imasu, and Makiko Hashimoto

Abstract. The light-absorbing Black Carbon (BC) aerosols have very sensitive role in affecting the Earth’s radiation budget and climate. In this study, satellite-based retrieval of BC over India is presented based on observations from the Cloud and Aerosol-Imager-2 (CAI-2) on-board the Greenhouse gases Observing Satellite-2 (GOSAT-2). To evaluate and validate the satellite retrievals, near surface BC mass concentrations measured across a network of aerosol observatories (ARFINET) over India are used and the findings are extended to comprehend the global BC features. As the analysis revealed, this satellite retrieval fairly depicts the regional and seasonal features of BC over the Indian region, which are similar to those recorded by surface observations. The validation and closure studies between the two data sets show RMSE < 1 and absolute difference below 2 µg m-3 for > 60 % of simultaneous observations, possessing fairly good associations in Dec-Jan-Feb (R ~ 0.73) and Mar-Apr-May (R ~ 0.76). Over the hotspot regions of India, the satellite retrievals show soot volume fraction of ~ 5 %, columnar single scattering albedo of ~ 0.8 and BC column optical depth of ~ 0.1; which are comparable to that of other in-situ or satellite measurements. In terms of global spatio-temporal variability, satellite retrieval shows higher BC occurring mostly in areas where biomass burning is intense. Overall, this study highlights the effectiveness of satellite retrieval of BC, which could be effectively used for the regular monitoring of BC load arising out of vehicular/ industrial/ biomass burning activities across the globe.

Mukunda M. Gogoi et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-555', Anonymous Referee #1, 08 Oct 2022
    • AC1: 'Reply on RC1', Mukunda M Gogoi, 17 Jan 2023
    • AC3: 'Reply on RC1', Mukunda M Gogoi, 17 Jan 2023
  • RC2: 'Comment on acp-2022-555', Anonymous Referee #2, 09 Oct 2022
    • AC2: 'Reply on RC2', Mukunda M Gogoi, 17 Jan 2023

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-555', Anonymous Referee #1, 08 Oct 2022
    • AC1: 'Reply on RC1', Mukunda M Gogoi, 17 Jan 2023
    • AC3: 'Reply on RC1', Mukunda M Gogoi, 17 Jan 2023
  • RC2: 'Comment on acp-2022-555', Anonymous Referee #2, 09 Oct 2022
    • AC2: 'Reply on RC2', Mukunda M Gogoi, 17 Jan 2023

Mukunda M. Gogoi et al.

Mukunda M. Gogoi et al.

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Short summary
Considering the climate warming potential of atmospheric Black Carbon, satellite-based retrieval is a novel idea. This study highlights the regional distribution of BC based on observations by Cloud and Aerosol Imager-2 on-board the GOSAT-2 satellite and near surface measurements of BC in the ARFINET. The satellite retrieval fairly depicts the regional and seasonal features of BC over the Indian region, which are similar to those recorded by surface observations.
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