19 Sep 2022
19 Sep 2022
Status: this preprint is currently under review for the journal ACP.

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

Mukunda M. Gogoi1, S. Suresh Babu1, Ryoichi Imasu2, and Makiko Hashimoto3 Mukunda M. Gogoi et al.
  • 1Space Physics Laboratory, Vikram Sarabhai Space Centre, ISRO, Thiruvananthapuram 695-022, India
  • 2Atmosphere and Ocean Research Institute, The University of Tokyo, Chiba 277-8568, Japan
  • 3Space Technology Directorate I, Earth observation research centre, JAXA, Ibaraki 305-8505, Japan

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: open (until 31 Oct 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

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.