Abstract
Abstract. This article describes the latest stable release (version 2.2) of the Atmospheric Radiative Transfer Simulator (ARTS), a public domain software for radiative transfer simulations in the thermal spectral range (microwave to infrared). The main feature of this release is a planetary toolbox that allows simulations for the planets Venus, Mars, and Jupiter, in addition to Earth. This required considerable model adaptations, most notably in the area of gaseous absorption calculations. Other new features are also described, notably radio link budgets (including the effect of Faraday rotation that changes the polarization state) and the treatment of Zeeman splitting for oxygen spectral lines. The latter is relevant, for example, for the various operational microwave satellite temperature sensors of the Advanced Microwave Sounding Unit (AMSU) family.
Highlights
Numerical radiative transfer (RT) modeling with computers perhaps started from the urge to understand atmospheric radiant energy fluxes
When extending radiative transfer modeling from Earth to other planets, the major challenge is to remove a number of assumptions on basic physical parameters made in the model itself or in the input data
In order to apply HIghresolution TRANsmission molecular absorption database (HITRAN) spectroscopic data, Atmospheric Radiative Transfer Simulator (ARTS) contains a hard-coded table of relative isotopologue abundances in the Earth atmosphere, where the relative abundance is the ratio of the abundance of an isotopologue to the abundance of the gas species over all its isotopologues
Summary
Numerical radiative transfer (RT) modeling with computers perhaps started from the urge to understand atmospheric radiant energy fluxes. The structure is as follows: Sect. 2 describes the planetary toolbox extensions and modifications, Sect. 3 describes other modifications and extensions, and Sect. 4 contains a summary and outlook
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