Colored soluble organic matter in inland waters of global key regions in 2017

Colored soluble organic matter (CDOM), also known as yellow matter, is the part of DOM that can strongly absorb ultraviolet radiation and blue light, and can significantly affect the biogeochemical cycle of carbon, nitrogen and phosphorus in water. CDOM is mainly composed of humic acid, fulvic acid, aromatic polymer and other soluble organic mixture. Effective monitoring of CDOM concentration is of great significance to evaluate the level and spatial distribution of DOM in aquatic environment. Generally, Shimadzu UV Vis 2550 ultraviolet visible spectrophotometer and 5 cm cuvette are used to measure the absorbance of CDOM. The measuring wavelength range is 200 ~ 800 nm, and the interval is 1 nm. Ultra pure water milli-q water is used as blank reference. The absorption coefficient is obtained by conversion of the existing formula. Due to the complex composition of CDOM, a (254) is widely used to characterize the concentration of CDOM in water samples at home and abroad. This data set is based on sentinel 2A / b sensor data to produce quarterly water colored soluble organic matter products in key regions of the world. Including regions: Beijing Tianjin Hebei, Yangtze River Delta, Pearl River Delta, Sri Lanka, Indiana.