Preprints
https://doi.org/10.5194/acp-2021-283
https://doi.org/10.5194/acp-2021-283

  14 Jun 2021

14 Jun 2021

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

Evaluation of aerosol optical depths and clear-sky radiative fluxes of the CERES Edition 4.1 SYN1deg data product

David Fillmore1, David Rutan2, Seiji Kato3, Fred Rose2, and Thomas Caldwell2 David Fillmore et al.
  • 1University Center for Atmospheric Research, Boulder, CO. 80307
  • 2SSAI, Hampton, VA, 23666
  • 3NASA Langley Research Center, Hampton, VA, 23666

Abstract. Aerosol optical depths (AOD) used for the Edition 4.1 Clouds and the Earth’s Radiant Energy System (CERES) Synoptic (SYN1deg) are evaluated. AODs are derived from Moderate Resolution Imaging Spectroradiometer (MODIS) observations and assimilated by an aerosol transport model (MATCH). As a consequence, clear-sky AODs closely match with those derived from MODIS instruments. AODs under all-sky conditions are larger than AODs under clear-sky conditions, which is supported by ground-based AERONET observations. When all-sky MATCH AODs are compared with Modern-Era Retrospective Analysis for Research and Applications (MERRA2) AODs, MATCH AODs are generally larger than MERRA2 AODS especially over convective regions (e.g. Amazon, central Africa, and eastern Asia). The difference is largely caused by MODIS AODs used for assimilation. Including AODs with larger retrieval uncertainty makes AODs over the convective regions larger. When AODs are used for clear-sky irradiance computations and computed downward shortwave irradiances are compared with ground- based observations, the computed instantaneous irradiances are 1 % to 2 % larger than observed irradiances. The comparison of top-of-atmosphere clear-sky irradiances with those derived from CERES observations suggests that AODs used for surface radiation observation sites are larger by 0.01 to 0.03, which is within the uncertainty of instantaneous MODIS AODs. However, the comparison with AERONET AOD suggests AODs used for computations over desert sites are 0.08 larger. The cause of positive biases of downward shortwave irradiance and AODs for the desert sites are unknown.

David Fillmore et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-283', Anonymous Referee #1, 07 Jul 2021
  • RC2: 'Comment on acp-2021-283', Anonymous Referee #3, 22 Sep 2021

David Fillmore et al.

David Fillmore et al.

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Short summary
This paper presents an evaluation of the aerosol analysis (haze, dust, smoke, etc.) incorporated into the Clouds and the Earth's Radiant Energy System (data products, as well as the aerosols impact on solar radiation reaching the surface. CERES is a NASA Earth observation mission with instruments flying on various polar- orbiting satellites. Its primary objective is the study of the radiative energy balance of the climate system, along with the influence of clouds and aerosols on this balance.
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