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首页> 外文期刊>SOLA: Scientific Online Letters on the Atmosphere >Comparisons of δ-Two-Stream and δ-Four-Stream Radiative Transfer Schemes in RRTMG for Solar Spectra
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Comparisons of δ-Two-Stream and δ-Four-Stream Radiative Transfer Schemes in RRTMG for Solar Spectra

机译：RRTMG在太阳光谱中的δ-二流和δ-四流辐射转移方案的比较

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摘要

Five δ-two-stream and δ-four-stream schemes are compared in solar spectra using the Rapid Radiative Transfer Model for General Circulation Models Applications (RRTMG). By calculating the flux and heating rate in various atmosphere, it is found that, in accuracy, the δ-four-stream schemes overwhelmingly outperform the δ-two-stream schemes. The precision of adding algorithm of the δ-four-stream spherical harmonic expansion (δ-4SDA) is comparable to that of adding algorithm of the δ-four-stream discrete ordinates method (δ-4DDA). Furthermore, the accuracy of the adding algorithm of δ-Eddington approximation (δ-2SDA) is close to that of δ-two-stream approximation with Practical Improved Flux Method (δ-PIFM), while adding algorithm of δ-two-stream discrete ordinates method (δ-2DDA) produces the poorest results among the five approximate schemes. For the RRTMG model with radiative transfer calculation, the computational time of δ-4SDA is about 1.5 times that of δ-two-stream schemes, and the computational time of δ-4SDA is about 88% that of δ-4DDA.
机译：使用快速散热模型应用（RRTMG），在太阳光谱中比较了五个δ-二流和δ-四流方案。通过计算各种气氛中的焊剂和加热速率，发现，精确率，Δ-四流方案压倒性地优于δ-双流方案。 δ-四流球形谐波膨胀（δ-4SDA）的添加算法的精度与δ-四流离散坐标方法（Δ-4dda）的添加算法的精度相当。此外，Δ-eDdentOn近似（Δ-2SDA）的添加算法的准确性接近与实际改进的通量法（Δ-PIFM）的δ-二流近似的精度，同时添加δ-二流离散的算法坐标方法（Δ-2DDA）在五种近似方案中产生最糟糕的结果。对于具有辐射转移计算的RRTMG模型，Δ-4SDA的计算时间约为δ-2-流方案的1.5倍，Δ-4SDA的计算时间约为Δ-4DDA的88％。

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