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首页> 外文期刊>Journal of Atmospheric Pollution >The Analysis of Influence of Weather Conditions on Atmospheric Extinction Coefficient over Bauchi, North Eastern Nigeria
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The Analysis of Influence of Weather Conditions on Atmospheric Extinction Coefficient over Bauchi, North Eastern Nigeria

机译：天气条件对尼日利亚东北部包奇市大气消光系数的影响分析

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摘要

Weather conditions are natural causes of visibility deterioration and increase in atmospheric extinction coefficient at a place. A 10- year dataset (1998-2007) of visibility and meteorological parameters such as Relative Humidity, Temperature and Atmospheric Pressure measured every 3-hour daily were analysed to examine the dependence of Atmospheric Extinction Coefficient, βext on seasonal meteorological conditions and synoptic weather patterns in Bauchi, a City in the North-eastern-Nigeria. From the visibility data obtained, the corresponding atmospheric extinction coefficient (βext) for the period under review was computed by using the Koschmieder relationship. In year 2000, when the Relative Humidity and atmospheric extinction coefficient, βext are highest, the temperature and visibility values are lowest. In 2003, when temperature (29.82°C) is highest, the Relative Humidity (42.52%) is lowest, although, the atmospheric coefficient was not at its lowest neither was the visibility (18.49km) at its highest. Of the years considered, year 2000 has the highest estimated atmospheric extinction coefficient, βext for both raining season and harmattan season. The raining season (June-September) has βext of 0.267 while the harmattan season has βext of 0.689. Their respective decadal mean for both raining season and harmattan season for the period under review are 0.205 ± 0.036 and 0.689±0.133.
机译：天气状况是导致可见度降低和某个地方大气消光系数增加的自然原因。分析了一个10年的数据集（1998-2007年），该数据集包括可见性和气象参数，例如每天每3小时测量一次的相对湿度，温度和大气压，以检查大气消光系数，βext对季节性气象条件和天气天气模式的依赖性位于尼日利亚东北部城市包奇（Bauchi）。从获得的可见度数据，通过使用Koschmieder关系，计算了回顾期间相应的大气消光系数（βext）。在2000年，当相对湿度和大气消光系数βext最高时，温度和可见度值最低。 2003年，当温度（29.82°C）最高时，相对湿度（42.52％）最低，尽管大气系数并非最低，能见度（18.49km）也最高。在所考虑的年份中，2000年的大气绝灭系数估计最高，在雨季和有害季节都为βext。雨季（6月至9月）的βext为0.267，而harmattan季节的βext为0.689。在本报告所述期间，它们在雨季和harmattan季的各自十年平均值为0.205±0.036和0.689±0.133。

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