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The THOR+HELIOS general circulation model: multi-wavelength radiative transfer with accurate scattering by clouds/hazes

The THOR+HELIOS general circulation model: multi-wavelength radiative transfer with accurate scattering by clouds/hazes

Authors :
Deitrick, Russell
Heng, Kevin
Schroffenegger, Urs
Kitzmann, Daniel
Grimm, Simon L.
Malik, Matej
Mendonça, João M
Morris, Brett M.
Source :
Deitrick, R, Heng, K, Schroffenegger, U, Kitzmann, D, Grimm, S L, Malik, M, Mendonça, J M & Morris, B M 2022, ' The THOR + HELIOS general circulation model: multiwavelength radiative transfer with accurate scattering by clouds/hazes ', Monthly Notices of the Royal Astronomical Society, vol. 512, no. 3, pp. 3759-3787 . https://doi.org/10.1093/mnras/stac680, Deitrick, Russell; Heng, Kevin; Schroffenegger, Urs; Kitzmann, Daniel; Grimm, Simon L.; Malik, Matej; Mendonça, João M; Morris, Brett M. (2022). The THOR + HELIOS general circulation model: multiwavelength radiative transfer with accurate scattering by clouds/hazes. Monthly notices of the Royal Astronomical Society, 512(3), pp. 3759-3787. Oxford University Press 10.1093/mnras/stac680
Publication Year :
2022
Publisher :
arXiv, 2022.

Abstract

General circulation models (GCMs) provide context for interpreting multi-wavelength, multi-phase data of the atmospheres of tidally locked exoplanets. In the current study, the non-hydrostatic THOR GCM is coupled with the HELIOS radiative transfer solver for the first time, supported by an equilibrium chemistry solver (FastChem), opacity calculator (HELIOS-K) and Mie scattering code (LX-MIE). To accurately treat the scattering of radiation by medium-sized to large aerosols/condensates, improved two-stream radiative transfer is implemented within a GCM for the first time. Multiple scattering is implemented using a Thomas algorithm formulation of the two-stream flux solutions, which decreases the computational time by about 2 orders of magnitude compared to the iterative method used in past versions of HELIOS. As a case study, we present four GCMs of the hot Jupiter WASP-43b, where we compare the temperature, velocity, entropy, and streamfunction, as well as the synthetic spectra and phase curves, of runs using regular versus improved two-stream radiative transfer and isothermal versus non-isothermal layers. While the global climate is qualitatively robust, the synthetic spectra and phase curves are sensitive to these details. A THOR+HELIOS WASP-43b GCM (horizontal resolution of about 4 degrees on the sphere and with 40 radial points) with multi-wavelength radiative transfer (30 k-table bins) running for 3000 Earth days (864,000 time steps) takes about 19-26 days to complete depending on the type of GPU.<br />Comment: 31 pages, 24 figures, accepted for publication at MNRAS

Details

Database :
OpenAIRE
Journal :
Deitrick, R, Heng, K, Schroffenegger, U, Kitzmann, D, Grimm, S L, Malik, M, Mendon&#231;a, J M &amp; Morris, B M 2022, &#39; The THOR + HELIOS general circulation model: multiwavelength radiative transfer with accurate scattering by clouds/hazes &#39;, Monthly Notices of the Royal Astronomical Society, vol. 512, no. 3, pp. 3759-3787 . https://doi.org/10.1093/mnras/stac680, Deitrick, Russell; Heng, Kevin; Schroffenegger, Urs; Kitzmann, Daniel; Grimm, Simon L.; Malik, Matej; Mendon&#231;a, Jo&#227;o M; Morris, Brett M. (2022). The THOR + HELIOS general circulation model: multiwavelength radiative transfer with accurate scattering by clouds/hazes. Monthly notices of the Royal Astronomical Society, 512(3), pp. 3759-3787. Oxford University Press 10.1093/mnras/stac680 <http://dx.doi.org/10.1093/mnras/stac680>
Accession number :
edsair.doi.dedup.....3cd6cc4589563ba5789f2244843610a3
Full Text :
https://doi.org/10.48550/arxiv.2203.02293