Evaluation of IMERGV06B over nontraditional regions using Ground Validation-Multi Radar/Multi-Sensor (GV-MRMS): oceans

Abstract:

Quantitative understanding of the water cycle is most important to manage and understand water systems under a changing climate. As one of the fundamental components of the water cycle, precipitation needs to be studied in detail. The majority of the global precipitation occurs over the oceans, hence reliable estimation of precipitation over these regions is crucial. Unfortunately, due to remoteness and scale in situ observations are limited, and only satellite-based precipitation products (SPPs) provide quasi-global coverage of precipitation over oceans. While the great success of the Tropical Rainfall Measuring Mission (TRMM) and its successor Global Precipitation Measurement (GPM) accelerated the development of retrieval algorithms, precipitation estimation remain a challenge and validation is non common over these regions.

This work aims to understand the uncertainty in IMERGV06B over “nontraditional” regions such as ocean and coasts. The analysis of IMERGV06B is studied in detail by considering the Early, Late and Final runs against the high-resolution Ground Validation - Multi Radar/Multi-Sensor (GV-MRMS) at 0.1° and half hourly resolution for the 2015 year. Moreover, PMW and IR only components are analyzed to trace the uncertainty from the Level-2 products. The results of quantification and detection of IMERGV06B over ocean and coasts will be presented.