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利用Lowtran 7所能提供的计算参数 ,分别计算了小于 4 0 0nm(紫外辐射 )、4 0 0～ 70 0nm (光合有效辐射 )和大于 70 0nm(红外辐射 ) 3个波段的总日射占全波段总日射的比例 ,并研究了不同太阳高度角、不同气溶胶、不同海拔高度以及大气中不同水汽和气溶胶含量对上述比例的影响。以前实测中发现的光合有效辐射所占比例有随地理纬度减少而略有增长的趋势得到了合理的论证 ;而理论模式的计算结果与我们的实测季节过完全一致 ,则证明所用方法是合理和可行的
Using the calculation parameters provided by Lowtran 7, the total solar radiation of less than 400 nm (ultraviolet radiation), 400 to 70 nm (photosynthetically active radiation) and more than 70 nm (infrared radiation) Total solar radiation, and the effects of different solar elevation angles, different aerosols, different altitudes, and different levels of water vapor and aerosol in the atmosphere on these ratios were studied. The proportion of photosynthetically active radiation that was found in previous surveys has been reasonably demonstrated by a slight increase with the decrease of geographical latitudes. However, the calculated results of theoretical models are exactly the same as our measured seasons, which proves that the method used is reasonable feasible