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首页> 外文期刊>American journal of applied sciences >Estimate of Aerosol Optical Depth Using Broadband Direct Normal Observations at Highest Polluted Area in the World
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Estimate of Aerosol Optical Depth Using Broadband Direct Normal Observations at Highest Polluted Area in the World

机译：利用宽带直接正态观测估算世界上最高污染区的气溶胶光学深度

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Problem statement: The measurement of different components of direct solar radiation for this research has been carried out in Helwan, Egypt. Helwan (Latitude 29°52 N, Longitude 31°20 E). This is a considered as the largest polluted region in the world. The level of pollution in Helwan region is higher, compared to the international limit by about 7 or 10 times in industrial and populated region respectively. Approach: The daily variation for different components of solar radiation bands as global, direct (total, yellow, red and infrared) and diffuse solar radiation had been studied and discussed. The data measurements have been taken for nine years (1991-2000). Hourly data of solar irradiance on a horizontal plane had also been recorded simultaneously together with relative humidity and wind speed along with some traditional techniques for selecting the clear sky days of the period examined. Results: The results clearly showed seasonal dynamics in aerosol loading, type and perceptible water. Conclusion: Background levels of aerosols, which we defined as yellow color less than 0.10, had observed at almost all sites but varying frequencies.
机译：问题陈述：这项研究的直接太阳辐射不同成分的测量已在埃及的Helwan进行。 Helwan（纬度29°52 N，经度31°20 E）。这被认为是世界上最大的污染地区。与国际限制相比，Helwan地区的污染水平更高，分别是工业和人口稠密地区的7倍或10倍。方法：研究并讨论了太阳辐射波段不同分量的每日变化，例如整体，直接（总，黄，红和红外）和漫射太阳辐射。数据测量已经进行了九年（1991-2000年）。还同时记录了水平面每小时的太阳辐照度数据，相对湿度和风速，以及一些用于选择所检查时期晴空的传统技术。结果：结果清楚地表明了气溶胶负荷，类型和可感知水的季节动态。结论：几乎在所有地点都观察到气溶胶的背景水平，我们定义为小于0.10的黄色，但频率变化。

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