Preprints
https://doi.org/10.5194/acp-2021-521
https://doi.org/10.5194/acp-2021-521

  27 Jul 2021

27 Jul 2021

Review status: this preprint is currently under review for the journal ACP.

Global maps of aerosol single scattering albedo using combined CERES-MODIS retrieval

Archana Devi1 and Sreedharan Krishnakumari Satheesh1,2,3 Archana Devi and Sreedharan Krishnakumari Satheesh
  • 1Centre for Atmospheric and Oceanic Sciences, Indian Institute of Science, Bengaluru, India
  • 2Divecha Centre for Climate Change, Indian Institute of Science, Bengaluru, India
  • 3DST Centre of Excellence in Climate Change, Indian Institute of Science, Bengaluru, India

Abstract. Single Scattering Albedo (SSA) is a leading contributor to the uncertainty in aerosol radiative impact assessments. Therefore accurate information on aerosol absorption is required on a global scale. In this study, we have applied a multi-satellite algorithm to retrieve SSA using the concept of ‘critical optical depth.’ Global maps of SSA were generated following this approach using spatially and temporally collocated data from Clouds and the Earth’s Radiant Energy System (CERES) and Moderate Resolution Imaging Spectroradiometer (MODIS) sensors on board Terra and Aqua satellites. The method has been validated using the data from aircraft-based measurements of various field campaigns. The retrieval uncertainty is ±0.03 and depends on both the surface albedo and aerosol absorption. Global mean SSA estimated over land and ocean is 0.93 and 0.97, respectively. Seasonal and spatial distribution of SSA over various regions are also presented. The global maps of SSA, thus derived with improved accuracy, provide important input to climate models for assessing the climatic impact of aerosols on regional and global scales.

Archana Devi and Sreedharan Krishnakumari Satheesh

Status: open (extended)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-521', Anonymous Referee #1, 07 Aug 2021 reply

Archana Devi and Sreedharan Krishnakumari Satheesh

Archana Devi and Sreedharan Krishnakumari Satheesh

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Short summary
Global maps of aerosol absorption were generated using a multi-satellite retrieval algorithm. The retrieved values have been validated using aircraft-based measurements and compared with the most widely used global dataset. Seasonal and spatial distribution of aerosol absorption over various regions are also presented. These global maps of SSA with improved accuracy provide important input to climate models for assessing the climatic impact of aerosols on regional and global scales.
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