A Comprehensive Evaluation of Near-Real-Time and Research Products of IMERG Precipitation over India for the Southwest Monsoon Period

Precipitation is one of the integral components global hydrological cycle. Accurate estimation precipitation vital for numerous applications ranging from hydrology to climatology. Following launch Global Measurement (GPM) Core Observatory, Integrated Multi-satellite Retrievals GPM (IMERG) product was released. The IMERG provides estimates at finer spatiotemporal resolution (e.g., 0.1°/half-hourly) and has shown be better than other contemporary multi-satellite products over most parts globe. In this study, near-real-time research have been extensively evaluated against a daily rain-gauge-based dataset India southwest monsoon period. addition, current version 6 or Final Run (IMERG-F V6) compared with its predecessor, 5, error characteristics IMERG-F V6 pre-GPM periods assessed. spatial distributions different metrics country show that both Early Late Runs) similar in estimation. However, larger errors V6, as expected. Bias all-India mean rainfall about 3–4 times product. Both V5 country. Similarly, detection rainy days. exhibits performance days during period (2014–2017) (2010–2013). contribution intensity intervals total captured well by estimates. Furthermore, results reveal under-detect overestimate light 2.5–7.5 mm day−1, which needs improved next release. study would beneficial end-users integrate any specific application.