Preprints
https://doi.org/10.5194/gmd-2021-439
https://doi.org/10.5194/gmd-2021-439
Submitted as: model description paper
23 Mar 2022
Submitted as: model description paper | 23 Mar 2022
Status: this preprint is currently under review for the journal GMD.

Introduction of the DISAMAR radiative transfer model: Determining Instrument Specifications and Analysing Methods for Atmospheric Retrieval (version 4.1.5)

Johan F. de Haan, Ping Wang, Maarten Sneep, J. Pepijn Veefkind, and Piet Stammes Johan F. de Haan et al.
  • Royal Netherlands Meteorological Institute (KNMI), De Bilt, the Netherlands

Abstract. DISAMAR is a computer model developed to simulate retrievals of properties of atmospheric trace gases, aerosols, clouds, and the ground surface from passive remote sensing observations in wavelength range from 270 to 2400 nm. It is being used for the TROPOMI/Sentinel-5P and Sentinel-4/5 missions to derive Level-1b product specifications. DISAMAR uses the doubling-adding method and the layer-based orders of scattering method for radiative transfer calculations. It can perform retrievals using three different approaches: Optimal Estimation (OE), Differential Optical Absorption Spectroscopy (DOAS), and the combination of DOAS and OE, called DISMAS (DIfferential and SMooth Absorption Separated). The derivatives, which are needed in the OE and DISMAS retrievals, are derived in a semi-analytical way from the adding formulas. DISAMAR uses plane-parallel homogeneous atmospheric layers with a pseudo-spherical correction for large solar zenith angles. DISAMAR has various novel features and diverse retrieval possibilities such as retrieving aerosol layer height and ozone vertical profile. This paper provides an overview of the DISAMAR model version 4.1.5 without treating all the details. We focus on the principle of the layer-based orders of scattering method, the calculation of the semi-analytical derivatives, and the DISMAS retrieval method, because it is to our knowledge the first time that these methods are described. We demonstrate some applications of DISMAS and the derivatives.

Johan F. de Haan et al.

Status: open (until 15 Jun 2022)

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

Johan F. de Haan et al.

Johan F. de Haan et al.

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Short summary
In this paper we describe the principle of the DISAMAR radiative transfer model version 4.1.5 and demonstrate some applications. DISAMAR simulates satellite measured spectrum from ultraviolet to near infrared wavelength range and retrieves atmospheric composition, cloud, or aerosol parameters. Instrument features can be specified in the simulation and retrieval separately. DISAMAR has been used to derive aerosol layer height product and ozone profile product for TROPOMI.