A Study of Ångström's turbidity parameters from solar radiation measurements in India
A Study of Ångström's turbidity parameters from solar radiation measurements in India
复制标题
印度太阳辐射测量中的 Ångström 浊度参数研究
DOI：
10.1111/j.2153-3490.1969.tb00489.x
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发表时间：
1969
期刊：
影响因子：
2
通讯作者：
S. Hariharan
中科院分区：
文献类型：
--
作者：
A. Mani;O. Chacko;S. Hariharan
Angstrom浊度系数的值？和波长指数已经计算了一些站在印度的直接太阳辐射的日射强度测量，为整个光谱和特定的光谱区域使用过滤器OG 1，RG 2和RG 8。注意到大的季节性变化，夏季高值，冬季低值。降雨和冲刷是有效的，在消除气溶胶从大气中和一个显着的下降是注意到？在雷暴及季候风开始后，所有气象站的气温均会上升。价值观？在南亚次大陆南半部的观测站，平均值全年基本保持不变，平均值约为1.0，表明尽管夏季浑浊度大幅增加，但较小的霾粒子占主导地位，粒径分布保持不变。在次大陆的北方，？显示季节性变化，数值较低，有时在夏季变为零或负值，在冬季为通常可接受的值。因此，在印度北部和中部，虽然较小的颗粒在冬季数量较多，但大颗粒在夏季占主导地位。DOI：10.1111/j.2153-3490.1969.tb00489.x
Values of Angstrom's turbidity coefficient ? and the wavelength exponent ? have been computed for a number of stations in India from pyrheliometric measurements of direct solar radiation, for the whole spectrum and for specified spectral regions using filters OG 1 , RG 2 and RG 8 . Large seasonal variations are noticed in ?, with high values in summer and low values in winter at all stations. Rainout and washout are effective in the removal of aerosols from the atmosphere and a marked fall is noticed in ? after thunderstorms and after the onset of the monsoon at all stations. Values of ? at stations in the southern half of the subcontinent remain more or less constant throughout the year with a mean value of about 1.0, indicating that smaller haze particles predominate and the size distribution remains the same despite the large increase of turbidity in summer. In the northern half of the sub-continent, ? shows seasonal variations with low values, sometimes becoming zero or negative in summer and the normally accepted values in winter. Over north and central India therefore, while smaller particles are more numerous in winter, large particles predominate in summer. DOI: 10.1111/j.2153-3490.1969.tb00489.x