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漫射辐射与总辐射之比
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     辐射生命
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     (2) Direct, global and reflected spectral irradiances with solar elevation angleand relative atmospheric mass have good correlation.
     散射辐射辐射太阳高度角和大气质量有关。
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  diffuse fraction of global solar irradiance
The annual and monthly mean diurnal variations of the diffuse fraction of global solar irradiance arriving on the ground at a tropical station in Sub-Sahel Africa is here been reported.
      


First, the application values, measurement fundamentals and process of the irradiancebased method were expounded, when it was used in observation of atmospheric environment(OAE). Second, based on the experiment study by using the VF921-256 spectrometer, some characteristic parameters, such as aerosol spectral optical deepth, ozone column content, diffuse-to-global irradiance ratio and aerosol size distribution were retrieved, which are necessary to OAE. Finally, some error sources which should be considered...

First, the application values, measurement fundamentals and process of the irradiancebased method were expounded, when it was used in observation of atmospheric environment(OAE). Second, based on the experiment study by using the VF921-256 spectrometer, some characteristic parameters, such as aerosol spectral optical deepth, ozone column content, diffuse-to-global irradiance ratio and aerosol size distribution were retrieved, which are necessary to OAE. Finally, some error sources which should be considered in OAE were discussed.

首先阐述辐照度法在大气环境监测中的应用价值及其测量原理和方法.其次,应用VF921-256光谱辐射计,通过实验研究反演获取了大气环境监测中比较关心的一些特性参数,如气溶胶光谱光学厚度、臭氧柱总量、漫射辐射与总辐射比以及气溶胶谱分布等.最后讨论了辐照度法在大气环境监测应用中需要考虑的几个影响因素.

The characteristics of solar shortwave radiation components over grassy marshland are discussed based on the data observed at SKYNET Hefei site on 285 clear days from Sep. 1999 to Aug. 2005. The results showed that, the diurnal variations of all shortwave radiation components exhibit nearly symmetrical converse "U" shape, with maximal values at solar noon. As to diffuse fraction of global solar irradiance, the opposite occurs. Every component shows the smallest value in December. The monthly mean daily total...

The characteristics of solar shortwave radiation components over grassy marshland are discussed based on the data observed at SKYNET Hefei site on 285 clear days from Sep. 1999 to Aug. 2005. The results showed that, the diurnal variations of all shortwave radiation components exhibit nearly symmetrical converse "U" shape, with maximal values at solar noon. As to diffuse fraction of global solar irradiance, the opposite occurs. Every component shows the smallest value in December. The monthly mean daily total values such as global solar irradiance, net shortwave and diffuse irradiance are maximal in June, while the maximal values of direct and surface upwelling shortwave irradiance appear in July, and there is a relative weak extrernum of diffuse solar irradiance. < EDF d > of spring is stronger than that of summer and winter months. Seasonal variations of other components are obviously marked by the highest (lowest) value in summer (winter), and the discrepancies between summer and winter months are remarkable. The maximal value of < KDFd > appears in January and there has a remarkable "jump" change in July. Its seasonal variation is the lowest, (highest) value appears in summer (winter) and its seven-year-averaged value is 38.4%.

利用SKYNET合肥站1999年9月至2005年8月期间285个无云晴天地面辐射收支观测资料,计算分析了合肥地区地表太阳短波辐射特征。结果表明,地表太阳短波辐射各个分量的日变化均呈上下午近似对称的倒“U”型分布,中午变化较平缓并出现最大值;漫射辐射与总辐射之比KDF呈“U”型日分布。太阳短波辐射各个分量的年最小值均出现在12月份,6月份总辐射、地表太阳短波净辐射和漫射辐射最强,7月份太阳直接辐射和地面反射的短波辐射最强但漫射辐射出现相对低谷。漫射辐射春季最强、夏季次之;太阳短波辐射其它各分量的季节变化均为夏季最强、春季次之、冬季最弱,而且冬夏差异较大。在1月份最大, 7月份值最小并有明显的突变现象;其季节变化特征为夏季最小,冬季最大;其七年平均值为38.4%。

 
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