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Thermal radiative transfer at NWP scales (1-10 km) with a fast 3D-capable model

Authors

Manev,  Mihail
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Mayer,  Bernhard
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Maier,  Richard
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Emde,  Claudia
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Voigt,  Aiko
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Manev, M., Mayer, B., Maier, R., Emde, C., Voigt, A. (2023): Thermal radiative transfer at NWP scales (1-10 km) with a fast 3D-capable model, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-4321


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021755
Abstract
Interactions between radiation and clouds are a source of significant uncertainty in current numerical weather prediction (NWP) models. With increased resolution previously neglected effects like the horizontal propagation of radiation will become more important. Future operational models will have to incorporate more realistic description of physical processes and remain computationally efficient.Our approach for tackling these problems in the thermal spectral range is to combine a traditional twostream solver with treatment of subgrid-scale cloud overlap (Črnivec and Mayer, 2019) with the Neighbouring Column Approximation (NCA) model (Klinger and Mayer, 2019), which parametrizes horizontal photon transport between adjacent grid-cells. In addition to a generalized vertical cloud overlap the model introduces horizontal overlap between neighbouring clouds. Thereby the hybrid model includes for the first time both subgrid-scale and grid-scale 3D radiative effects at a reasonable additional computational cost.The performance of the model is evaluated using benchmark Monte-Carlo model MYSTIC (Mayer, 2009) calculations of realistic cloud scenes derived from LES simulations. In addition we assess the benefits of the hybrid model in comparison with classical one-dimensional solvers.