Reference : Evaluating TMPA Rainfall over the Sparsely Gauged East African Rift
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
Evaluating TMPA Rainfall over the Sparsely Gauged East African Rift
Monsieurs, Elise mailto [Université de Liège - ULiège > Département de géographie > Unité de géographie physique et quaternaire (UGPQ) >]
Kirschbaum, Dalia mailto [> >]
Tan, Jackson mailto [> >]
Maki Mateso, Jean-Claude mailto [> >]
Jacobs, Liesbet mailto [> >]
Plisnier, Pierre-Denis mailto [> >]
Thiery, Wim mailto [> >]
Umutoni, Augusta mailto [> >]
Musoni, Didace mailto [> >]
Mugaruka Bibentyo, Toussaint mailto [> >]
Bamulezi Ganza, Gloire mailto [> >]
Ilombe Mawe, Guy mailto [> >]
Bagalwa, Luc mailto [> >]
Kankurize, Clairia mailto [> >]
Michellier, Caroline mailto [> >]
Stanley, Thomas mailto [> >]
Kervyn, François mailto [> >]
Kervyn, Matthieu mailto [> >]
Demoulin, Alain mailto [Université de Liège - ULiège > Département de géographie > Unité de géographie physique et quaternaire (UGPQ) >]
Dewitte, Olivier mailto [> >]
Journal of Hydrometeorology
American Meteorological Society
Yes (verified by ORBi)
[en] Accurate precipitation data are fundamental for understanding and mitigating the disastrous effects of many natural hazards in mountainous areas. Floods and landslides, in particular, are potentially deadly events that can be mitigated with advanced warning, but accurate forecasts require timely estimation of precipitation, which is problematic in regions such as tropical Africa with limited gauge measurements. Satellite rainfall estimates (SREs) are of great value in such areas, but rigorous validation is required to identify the uncertainties linked to SREs for hazard applications. This paper presents results of an unprecedented record of gauge data in the western branch of the East African Rift, with temporal resolutions ranging from 30 min to 24 h and records from 1998 to 2018. These data were used to validate the Tropical Rainfall Measuring Mission (TRMM) Multisatellite Precipitation Analysis (TMPA) research version and near-real-time products for 3-hourly, daily, and monthly rainfall accumulations, over multiple spatial scales. Results indicate that there are at least two factors that led to the underestimation of TMPA at the regional level: complex topography and high rainfall intensities. The TMPA near-real-time product shows overall stronger rainfall underestimations but lower absolute errors and a better performance at higher rainfall intensities compared to the research version. We found area-averaged TMPA rainfall estimates relatively more suitable in order to move toward regional hazard assessment, compared to data from scarcely distributed gauges with limited representativeness in the context of high rainfall variability.

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