Accuracy tests of radiation schemes used in hot Jupiter global circulation models
Accuracy tests of radiation schemes used in hot Jupiter global circulation models
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热木星全球环流模型中使用的辐射方案的精度测试
DOI:
10.1051/0004-6361/201323169
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发表时间:
2014
影响因子:
6.5
通讯作者:
Amundsen D
中科院分区:
文献类型:
--
作者:
Amundsen D
The treatment of radiation transport in global circulation models (GCMs) is crucial for correctly describing Earth and exoplanet atmospheric dynamics processes. The two-stream approximation and correlated-kmethod are currently state-of-the-art approximations applied in both Earth and hot Jupiter GCM radiation schemes to facilitate the rapid calculation of fluxes and heating rates. Their accuracy have been tested extensively for Earth-like conditions, but verification of the methods’ applicability to hot Jupiter-like conditions is lacking in the literature. We are adapting the UK Met Office GCM, the Unified Model (UM), for the study of hot Jupiters, and present in this work the adaptation of the Edwards-Slingo radiation scheme based on the two-stream approximation and the correlated-kmethod. We discuss the calculation of absorption coefficients from high-temperature line lists and highlight the large uncertainty in the pressure-broadened line widths. We compare fluxes and heating rates obtained with our adapted scheme to more accurate discrete ordinate (DO) line-by-line (LbL) calculations ignoring scattering effects. We find that, in most cases, errors stay below 10% for both heating rates and fluxes using ~10k-coefficients in each band and a diffusivity factorD= 1.66. The two-stream approximation and the correlated-kmethod both contribute non-negligibly to the total error. We also find that using band-averaged absorption coefficients, which have previously been used in radiative-hydrodynamical simulations of a hot Jupiter, may yield errors of ~100%, and should thus be used with caution.
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