Minimum month precipitation deficit (mm)

The monthly difference between precipitation and potential evaporation (pan, free-water surface), without accounting for soil buffering capacity on water availability (after Harmsen et al. (2009), adapted from De Pauw (2002)). Also known as water deficit or hydrological deficit. Values are negative when evaporation demand is greater than rainfall.

该指标为降水量与潜在蒸散发（蒸发器、自由水面）的月尺度差值，未将土壤对水分有效性的缓冲能力纳入考量，改编自De Pauw(2002)的研究方法，参考Harmsen等人(2009)的相关成果。该指标亦称作水分亏缺或水文亏缺。当蒸散发需求大于降雨量时，指标数值为负值。