Do Derived Drought Indices Better Characterize Future Drought Change?

Current methods for climate change assessment ignore the significant differences in uncertainty model projections of two key constituents drought, precipitation, and evapotranspiration. We present here a new basis assessing future drought using simulations that addresses this limitation. The method estimates Standardized Precipitation Evapotranspiration Index (SPEI) two-stage process. first stage our proposed approach is to derive (SPI) reliable atmospheric variables, which are filtered with wavelet-based spectral transformation. This derived SPI then converted an equivalent SPEI by combining it evapotranspiration simulations. assess performance across Australia. consistency general circulation (GCM) projections, terms both frequency severity, improved SPI. Incorporating further improves multiple GCMs time scales. framework can also be generalized other water resources applications, where GCM precipitation affect impact assessments.