Abstract Winter Fog over the Indo Gangetic Basin (IGB) has drawn great attention during the recent decades due to its intense and prolonged episodes and having severe impact on the socio-economic aspects of the Indian sub-continent. In this study a simple methodology is used to retrieve day time fog, aerosol and Red-Blue Ratio (RBR) at a high temporal resolution of 1 min using the surface shortwave irradiance (Rs) from the Multifilter Rotating Shadowband Radiometer (MFRSR) and real-time sky images from the Total Sky Imager (TSI) during December 2014 and January 2015 over a station Varanasi in IGB. RBR distinguishes the sky condition from clear-haze-fog/cloud. The frequency of occurrence of fog per hour and per month is higher in January as compared to December and most of the time cloud fraction (CF) > 80%, Rs

中文翻译：

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使用短波辐照度的地面观测和印度恒河盆地站上空图像的冬季雾、气溶胶和红蓝比的高时间变异性：光学和辐射特性

摘要 近几十年来，印度恒河盆地 (IGB) 上空的冬雾由于其强烈而持久的发作并对印度次大陆的社会经济方面产生了严重影响，因此引起了人们的极大关注。在这项研究中，一种简单的方法用于使用来自多过滤器旋转阴影带辐射计 (MFRSR) 的表面短波辐照度 (Rs) 以 1 分钟的高时间分辨率检索日间雾、气溶胶和红蓝比 (RBR) 和真实的2014 年 12 月和 2015 年 1 月期间，来自全天空成像仪 (TSI) 的时间天空图像在 IGB 的瓦拉纳西站上空。RBR 将天空条件与晴朗的雾/云区分开来。与 12 月相比，1 月每小时和每月出现雾的频率更高，大部分时间云量 (CF) > 80%，Rs