资源环境科技发展态势分析平台

Loss terms in the land water budget (including drainage, runoff, and evapotranspiration) are encoded in the shape of soil moisture "drydowns": the soil moisture time series directly following a precipitation event, during which the infiltration input is zero. The rate at which drydowns occur-here characterized by the exponential decay time scale tau-is directly related to the shape of the loss function and is a key characteristic of global weather and climate models. In this study, we use 1 year of surface soil moisture observations from NASA's Soil Moisture Active Passive mission to characterize.. globally. Consistent with physical reasoning, the observations show that tau is lower in regions with sandier soils, and in regions that are more arid. To our knowledge, these are the first global estimates of tau-based on observations alone-at scales relevant to weather and climate models.