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首页> 外文期刊>Atmospheric and Climate Sciences >Investigation of Atmospheric Turbidity at Gharda&#239a (Algeria) Using Both Ground Solar Irradiance Measurements and Space Data
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Investigation of Atmospheric Turbidity at Gharda&#239a (Algeria) Using Both Ground Solar Irradiance Measurements and Space Data

机译：利用地面太阳辐照度测量和空间数据研究Gharda＆＃239a（阿尔及利亚）的大气浊度

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摘要

Four radiometric models are compared to study the Angstr ? m turbidity coefficient over Gharda ? a (Algeria). Five years of global irradiance measurements and space data recorded with MODIS are used to estimate . The models are referenced as for Dogniaux’s method, for Louche’s method, for Pinazo’s method, for Gueymard’s method and by for MODIS data. The results showed that and are very close as the couple and . values are between them. Results showed also that all Angstr ? m coefficient curves have the same annual trend with maximum and minimum values respectively in summer and winter months. Annual mean values of increased from 2005 to 2008 with a slight jump in 2007 except for . The city environment explains it since the urban aerosols predominate over all other types during this period. The jump in 2007 is attributed to the ozone layer thickness that undergoes the same behavior. Some models are then more sensitive to this atmospheric component than others. The occurrence frequency distribution showed that , , , and had their maximum recurrent values near 0.03, 0.07, 0.10, 0.09 and 0.02 respectively. The cumulative frequency distribution revealed also that and yielded maximum “clean to clear” conditions with respect to others while and had the minimum. The opposite was observed on the same pairs with regard to “clear to turbid” and “turbid to very turbid” conditions. Louche’s model gave middle values of sky conditions comparing to the other models.
机译：比较四种辐射模型以研究Angstr？ m在Gharda上的浊度系数？一个（阿尔及利亚）。五年的全球辐照度测量和用MODIS记录的空间数据用于估算。这些模型分别用于Dogniaux方法，Louche方法，Pinazo方法，Gueymard方法和MODIS数据。结果表明，和和夫妻俩非常接近。值在它们之间。结果还表明，所有Angstr？ m系数曲线具有相同的年度趋势，分别在夏季和冬季月份具有最大值和最小值。从2005年到2008年的年均值有所增加，2007年略有上升。城市环境可以解释这一点，因为在此期间，城市气溶胶高于所有其他类型的气溶胶。 2007年的增长归因于经历相同行为的臭氧层厚度。因此，某些模型比其他模型对这种大气成分更敏感。出现频率分布显示，，和的最大重复值分别接近0.03、0.07、0.10、0.09和0.02。累积的频率分布也揭示了这一点，并且相对于其他情况产生了最大的“干净到清晰”条件，而具有最小的条件。在相同的对上，在“透明至浑浊”和“浑浊至非常浑浊”的条件下观察到相反的情况。与其他模型相比，Louche的模型给出了天空条件的中间值。

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