9 research outputs found
Climate change will affect global water availability through compounding changes in seasonal precipitation and evaporation
Both seasonal and annual mean precipitation and evaporation influence patterns of water availability impacting society and ecosystems. Existing global climate studies rarely consider such patterns from non-parametric statistical standpoint. Here, we employ a non-parametric analysis framework to analyze seasonal hydroclimatic regimes by classifying global land regions into nine regimes using late 20th century precipitation means and seasonality. These regimes are used to assess implications for water availability due to concomitant changes in mean and seasonal precipitation and evaporation changes using CMIP5 model future climate projections. Out of 9 regimes, 4 show increased precipitation variation, while 5 show decreased evaporation variation coupled with increasing mean precipitation and evaporation. Increases in projected seasonal precipitation variation in already highly variable precipitation regimes gives rise to a pattern of "seasonally variable regimes becoming more variable". Regimes with low seasonality in precipitation, instead, experience increased wet season precipitation
Three-parameter-based streamflow elasticity model: application to MOPEX basins in the USA at annual and seasonal scales
We present a three-parameter streamflow elasticity model
as a function of precipitation, potential evaporation, and change in groundwater
storage applicable at both seasonal and annual scales. The model was
applied to 245 Model Parameter Estimation Experiment (MOPEX) basins spread
across the continental USA. The analysis of the modified equation at annual and
seasonal scales indicated that the groundwater and surface water storage
change contributes significantly to the streamflow elasticity.
Overall, in case of annual as well as seasonal water balances,
precipitation has higher elasticity values when compared to both potential
evapotranspiration and storage changes. The streamflow elasticities show
significant nonlinear associations with the climate conditions of the
catchments indicating a complex interplay between elasticities and climate
variables with substantial seasonal variations