有云大气中太阳辐射通量的参数化计算
PARAMETERIZATION OF SOLAR RADIATIVE FLUX CALCULATION IN THE ATMOSPHERE
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摘要: 这里提出了一个建立在二流近似基础上的宽带太阳辐射传输计算模式.整个从0.2-3.58μm的太阳光谱区分成三个宽光谱间隔,各波段上的宽带等效光学厚度和单次散射反照率由已知的大气参数直接算出.在各波段上,二种以上大气成分重迭的辐射作用也得到适当的考虑.在考虑云的辐射作用时,云的单次散射反照率和后向散射参数是预先给定的,而云的光学厚度则根据云中液态水含量来算出.Abstract: Based on the two-stream approximation a broad-band parameterization scheme for solar radiative flux calculation is presented.The whole solar spectral region from 0.2 to 4.0 μm is divided into three broad spectral intervals.The effective broad-band optical depths and single scattering albedos in the atmosphere in each spectral interval can be obtained using parameterized formulae from known atmospheric parameters.The overlapping scattering or/and absorption effects of two atmospheric constituents are considered properly.In the consideration of radiative effect of clouds in the atmosphere the single scattering albedos and back scattering parameters of clouds in each broad spectral intervals are given preliminarily and the cloud optical depths are determined according to the cloud liquid water content.
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