Cimel Sunphotometer (CSPHOT): aerosol optical thickness data - csphotaot

The Cimel sunphotometer (CSPHOT) is a multi-channel, automatic sun-and-sky scanning radiometer that measures the direct solar irradiance and sky radiance at the Earth s surface. It takes measurements at predetermined discrete wavelengths in the visible and near-infrared parts of the spectrum to determine atmospheric transmission and scattering properties. The CSPHOT only operates during daylight (sun above horizon).西梅尔太阳光度计（Cimel sunphotometer，简称CSPHOT）是一款多通道全自动太阳-天空扫描辐射计，可在地球表面测量直接太阳辐照度与天空辐射亮度。该设备在光谱的可见光及近红外波段的预设离散波长处开展测量，以获取大气透射与散射特性。西梅尔太阳光度计仅在日间（太阳位于地平线以上时）运行。