Radiation transfer calculation method suitable for cloud micro-physical properties continuous variations

Abstract

The present invention relates to a radiation transfer calculation method suitable for cloud micro-physical properties continuous variations, based on a two-stream approximation scheme, the method comprising the following steps of 1) representing radiation flux of the cloud micro-physical properties continuous variations as a sum of constant terms and disturbance terms; 2) calculating and obtainingfirst radiation flux according to a traditional two-stream radiation transfer equation, and setting the first radiation flux as the constant terms; 3) substituting an asymmetry factor g and a singlescattering albedo [omega] into a traditional two-stream radiation transfer strength equation in a parameterized form by a perturbation method and forming a heterogeneity caused disturbance term equation set, and solving the heterogeneity caused disturbance term equation set and obtaining second radiation flux represented by two perturbation factors epsilon<omega> and epsilon<g>; and 4) summing thefirst radiation flux and the second radiation flux and solving the radiation flux of the cloud micro-physical properties continuous variations. The vertical nonuniform problem of intra-cloud opticalproperties in a climate model is effectively solved by the method, thereby improving accuracy of radiation calculation.

Description

technical field [0001] The invention belongs to the field of cloud radiation transmission, and in particular relates to a radiation transmission calculation method suitable for continuous changes of cloud microphysical properties. Background technique [0002] Clouds cover about 50% of the earth's area, and they are an important adjuster of the radiation budget of the earth-atmosphere system. Clouds play a very important role in radiation transmission. Clouds reflect about 50W / m 2 of radiant energy. In climate models, the precise calculation of cloud radiative transfer processes will largely affect the results of climate simulations and predictions. IPCC Third Report [3] It is pointed out that one of the key restrictive factors for the level development of current climate models is the cloud radiation parameterization scheme, which is also the main reason for the model uncertainty. Therefore, the accurate calculation of cloud radiative transfer parameterization process in...

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Problems solved by technology

This method can achieve high computational accuracy, but requires a large number of independent photon experiments, which is undoubtedly time-consuming and cannot be directly applied to the model

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