Method for constructing parameterized universal model of water ice and snow albedo

A technology of parametric models and general models, applied in special data processing applications, design optimization/simulation, etc., can solve problems such as large differences and achieve good universality

Active Publication Date: 2020-11-03
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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  • Application Information

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Problems solved by technology

Li et al. (2018) conducted observations of ice and snow albedo at Ngoring Lake in Maduo County, Qinghai, and also found that the calcu

Method used

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  • Method for constructing parameterized universal model of water ice and snow albedo
  • Method for constructing parameterized universal model of water ice and snow albedo
  • Method for constructing parameterized universal model of water ice and snow albedo

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Embodiment 1

[0028] This embodiment is a parameterized calculation method for the albedo of water, ice and snow. The calculation principle and construction process of the described method are as follows:

[0029] 1. Solar radiation percentage model:

[0030] Climatology calculates cloud sky solar radiation percentage of sunshine model by (1924) first proposed, the mathematical description is:

[0031]

[0032] where: is the insolation heat flux of cloudy sky / (W / m 2 ); is the astronomical radiation heat flux / (W / m 2 ); P is the average transparency coefficient of the atmosphere in all wavelength ranges; m is the optical air quality; S is the percentage of sunshine, indicating the actual sunshine time T real and theoretical sunshine time T sun The ratio of , that is, S=T real / T sun , with 0.0≤S≤1.0.

[0033] since (1924) proposed the model of total solar radiation in cloudy sky, experts and scholars in my country have carried out a large number of studies on insolation in c...

Embodiment 2

[0127] This embodiment is an improvement of the first embodiment, which is the refinement of the total solar albedo model of the first embodiment. In the calculation of the total albedo of solar radiation described in this embodiment, when:

[0128] When 0≤α<0.105rad:

[0129] a s =0.537-4.408(α-0.105).

[0130] This albedo calculation formula can be used when the sun's altitude angle is less than 6°, that is, when the sun is just rising or about to set, which provides convenience for engineering calculations.

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Abstract

The invention relates to a method for constructing a parameterized universal model of water ice and snow albedo. The method comprises the following steps: analyzing albedo characteristics; constructing a surface solar radiation total albedo model; and constructing an ice surface daily average albedo model of the snow cover. According to the method, a conclusion that pure water and pure water ice can be calculated by using the same albedo formula is obtained by applying a Fresnel theory, and a water-ice albedo parameterized universal model considering laws of latitude, earth rotation and sun-surrounding operation is provided on the basis of existing prototype observation data. Analysis shows that latitude and date have great influence on the daily average albedo of water, ice and snow, andthe albedo changes along with date or month. Compared with the influence of the ice thickness on the albedo, the influence of the solar altitude angle along with the latitude and date change is much greater. A calculation result of the parameterized general model of the water ice and snow albedo is matched with a comparison result of a prototype observation result, and an existing common albedo model calculation result based on the ice thickness is far deviated from the observation result.

Description

technical field [0001] The invention relates to a construction method for a parameterized general model of water, ice and snow albedo, a scientific and engineering calculation method for water ice albedo using integration, and a method for parameterized calculation of water ice and snow albedo. . Background technique [0002] Solar radiation means that the sun transmits energy in the form of electromagnetic waves, which is called solar energy. Although the solar energy received by the earth is only 1 / 2.2 billion of the total radiant energy emitted by the sun to the universe, it is the main source of energy for the movement of the earth's atmosphere and the main source of the earth's light and heat energy. [0003] The total radiation radiated by the sun to the surface of rivers and lakes, part of which will be reflected back to the atmosphere, is called reflected radiation, and the ratio of reflected radiation to total radiation is called albedo. For ice-covered rivers and...

Claims

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Application Information

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IPC IPC(8): G06F30/20
CPCG06F30/20
Inventor 杨开林郭新蕾王涛付辉潘佳佳李甲振郭永鑫
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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