28 Nov 2022
28 Nov 2022

HETEAC – The Hybrid End-To-End Aerosol Classification model for EarthCARE

Ulla Wandinger1, Athena Augusta Floutsi1, Holger Baars1, Moritz Haarig1, Albert Ansmann1, Anja Hünerbein1, Nicole Docter2, David Donovan3, Gerd-Jan van Zadelhoff3, Shannon Mason4, and Jason Cole5 Ulla Wandinger et al.
  • 1Leibniz Institute for Tropospheric Research (TROPOS), Leipzig, Germany
  • 2Free University of Berlin (FUB), Institute for Space Science, Berlin, Germany
  • 3Royal Netherlands Meteorological Institute (KNMI), De Bilt, The Netherlands
  • 4European Centre for Medium Range Weather Forecasts (ECMWF), Reading, United Kingdom
  • 5Environment and Climate Change Canada (ECCC), Toronto, Ontario, Canada

Abstract. The Hybrid End-To-End Aerosol Classification (HETEAC) model for the Earth Clouds, Aerosols and Radiation Explorer (EarthCARE) mission is introduced. The model serves as the common baseline for development, evaluation, and implementation of EarthCARE algorithms. It guarantees the consistency of different aerosol products from the multi-instrument platform and facilitates the conform specification of broad-band optical properties needed for EarthCARE radiative closure assessments. While the hybrid approach ensures that the theoretical description of aerosol microphysical properties is consistent with the optical properties of the measured aerosol types, the end-to-end model permits the uniform representation of aerosol types in terms of microphysical, optical, and radiative properties. Four basic aerosol components with prescribed microphysical properties are used to compose various natural and anthropogenic aerosols of the troposphere. The components contain weakly and strongly absorbing fine-mode as well as spherical and non-spherical coarse-mode particles and thus are representative for pollution, smoke, sea salt, and dust, respectively. Their microphysical properties are selected such that a good coverage of the observational phase space of intensive, i.e., concentration-independent, optical aerosol properties derived from EarthCARE measurements is obtained. Mixing rules to calculate optical and radiative properties of any aerosol blend composed of the four basic components are provided. Applications of HETEAC in the generation of test scenes, the development of retrieval algorithms for stand-alone and synergistic aerosol products from EarthCARE's Atmospheric Lidar (ATLID) and Multi-Spectral Imager (MSI), as well as for radiative closure assessments are discussed. In the end, conclusions for future development work are drawn.

Ulla Wandinger 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 egusphere-2022-1241', Anonymous Referee #1, 04 Jan 2023
  • RC2: 'Comment on egusphere-2022-1241', Anonymous Referee #2, 28 Jan 2023

Ulla Wandinger et al.

Ulla Wandinger et al.


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Short summary
We introduce an aerosol classification model that has been developed for the Earth Clouds, Aerosols and Radiation Explorer (EarthCARE). The model provides a consistent description of microphysical, optical, and radiative properties of common aerosol types such as dust, sea salt, pollution, and smoke. It is used for aerosol classification and assessment of radiation effects based on the synergy of active and passive observations with lidar, imager, and radiometer of the multi-instrument platform.