Quantitative drought monitoring in a typical cold river basin over Tibetan Plateau: An integration of meteorological, agricultural and hydrological droughts

•Standardized anomaly index was utilized for drought quantification.•Rain, snowmelt and glacier-melt standardized anomaly index was proposed.•We applied the method to Lhasa River Basin of Tibetan Plateau for drought monitoring.•Meteorological, agricultural and hydrological droughts were integrated.