A Calculation Method for Radiative Transfer Applicable to Continuous Variation of Cloud Microphysical Properties

Abstract

The present invention relates to a radiative transfer calculation method suitable for continuous changes in cloud microphysical properties. Based on a second-flow approximation scheme, the method includes the following steps: Step 1) Expressing the radiant flux with continuous changes in cloud microphysical properties as a constant term and a disturbance term and; step 2) calculate the first radiant flux according to the traditional second-flow radiative transfer equation, and set the first radiant flux as the constant item; step 3) use the perturbation method to combine the asymmetry factor g and the unit Substituting the parameterized form of the scattering albedo ω into the traditional two-flow radiation transfer intensity equation to form a non-uniformity-induced disturbance term equation group, and by solving the non-uniformity-induced disturbance term equation group, two micro-disturbance factors and the expression The second radiant flux; step 4) summing the first radiant flux and the second radiant flux to complete the solution of the radiant flux with continuously changing microphysical properties of the cloud. This method effectively solves the vertical inhomogeneity of optical properties inside clouds in climate models, thereby improving the accuracy of radiation calculations.

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 characteristics. 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 proce...

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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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