Regional and Seasonal Precipitation and Drought Trends in Ganga–Brahmaputra Basin

Satellite-based precipitation products can be a better alternative of rain gauges for hydro-meteorological studies in data-poor regions. This study aimed to evaluate how regional and seasonal drought patterns had changed the Ganga–Brahmaputra Basin between 1983 2020 with PERSIANN-CDR data. The spatial pattern winter drought, monsoon Standardized Precipitation Index (SPI) calculated different time scales were evaluated using principal component analysis. is one most populated river basins that flows through geographical Rain are heterogeneously distributed basin due its complex orography, highlighting significance gridded over gauge observations climate studies. Annual monthly trends original modified Mann–Kendall trend test, annual was found declining at rate 5.8 mm/year. An increasing observed pre-monsoon rainfall, whereas exhibited decreasing other months. Results Pettitt test showed series inhomogeneous changepoint occurred around 2000. Decreasing SPI indicated frequency intensity events. Winter clear basin; however, SPIs patterns. demonstrates applicability satellite-based data research Basin.