Estimation of daily rainfall over the upper Nile river basin using a continuously calibrated satellite infrared technique

Todd, Martin C.; Barrett, EC; Beaumont, M.J.; Bellerby, Tim

doi:10.1017/s1350482799001206

Cited by 34 publications

(24 citation statements)

References 11 publications

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“…Satellite algorithms using visible and IR techniques provide excellent temporal and spatial sampling from geostationary orbits, but this technique relies on the assumption that correspondences exist between cloud radiances and rain rates. Estimates are subject to threshold biases and contamination by nonraining cirrus (Todd et al 1999). The microwave radiometer affords a more direct inference of precipitation.…”

Section: Datamentioning

confidence: 99%

Regimes of Diurnal Variation of Summer Rainfall over Subtropical East Asia

et al. 2012

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Using hourly rain gauge records and Tropical Rainfall Measuring Mission 3B42 from 1998 to 2006, the authors present an analysis of the diurnal characteristics of summer rainfall over subtropical East Asia. The study shows that there are four different regimes of distinct diurnal variation of rainfall in both the rain gauge and the satellite data. They are located over the Tibetan Plateau with late-afternoon and midnight peaks, in the western China plain with midnight to early-morning peaks, in the eastern China plain with double peaks in late afternoon and early morning, and over the East China Sea with an early-morning peak. No propagation of diurnal phases is found from the land to the ocean across the coastlines. The different diurnal regimes are highly correlated with the inhomogeneous underlying surface, such as the plateau, plain, and ocean, with physical mechanisms consistent with the large-scale ''mountain-valley'' and ''land-sea'' breezes and convective instability. These diurnal characteristics over subtropical East Asia can be used as diagnostic metrics to evaluate the physical parameterization and hydrological cycle of climate models over East Asia.

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Section: Datamentioning

confidence: 99%

Regimes of Diurnal Variation of Summer Rainfall over Subtropical East Asia

et al. 2012

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“…Although the estimation of rainfall based on remote-sensing from satellites has shown some promise in Uganda (Asadullah et al, 2008) and other Nile countries (Todd et al, 1995;Todd 1999) at regional and seasonal scales, significant accuracy issues remain, and ground-gauged observations must be relied upon for most hydrological modelling applications. Hence, modellers rely on infilling sparse and incomplete gauged rainfall to produce spatially and temporally complete data sets.…”

Section: Introductionmentioning

confidence: 99%

Multi-site stochastic modelling of daily rainfall in Uganda

Kigobe

McIntyre

Wheater

et al. 2011

Hydrological Sciences Journal

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The availability of precipitation records in Uganda has significantly decreased since the 1970s, severely limiting the data available for hydrological modelling. This problem has been addressed in this study by using the generalized linear modelling (GLM) framework to develop stochastic daily rainfall models that have the capability for extending and infilling historic data sets. We have used a relatively sparse raingauge network in the Kyoga basin (in the Upper Nile) to reproduce spatial and temporal patterns of precipitation by fitting occurrence (logistic) and amounts (gamma) models as functions of dominant seasonal, climate and geographical controls. The GLMs were able to reproduce rainfall properties when predefined climatic zones are modelled independently. We were not able to represent the spatial variability of the equatorial climate with one integrated basin scale model, however this is not thought to preclude application to basin scale hydrological modelling.Key words generalized linear models; rainfall; stochastic models; climate change; Uganda; Kyoga; ENSO Modélisation stochastique multi-sites de la pluie journalière en Ouganda Résumé La disponibilité des données de précipitations en Ouganda a considérablement diminué depuis les années 1970, limitant fortement les données disponibles pour la modélisation hydrologique. Ce problème a été abordé dans cette étude dans le cadre de la modélisation linéaire généralisée (MLG), afin de développer des modèles stochastiques de pluie journalière qui puissent étendre et compléter les données historiques. Nous avons utilisé un réseau de pluviomètres de relativement faible densité dans le bassin du Kyoga (dans le Nil Supérieur), afin de reproduire les patrons spatiaux et temporels des précipitations en modélisant l'occurence (logistique) et les volumes (gamma) comme fonctions des forçages dominants saisonniers, climatiques et géographiques. Les MLG sont en mesure de reproduire les propriétés des pluies lorsque des zones climatiques pré-définies sont modélisées de façon indépendante. Nous n'avons pas pu représenter la variabilité spatiale du climat équatorial avec un modèle à l'échelle intégrée du bassin, cependant ceci ne semble pas devoir empêcher la mise en oeuvre d'une modélisation hydrologique à l'échelle du bassin.

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“…There have also been many region specific studies of the use of satellite rainfall data, several of these covering the African continent (Todd et al, 1999;Thorne et al, 2001;Grimes and Diop, 2003). However, despite their scientific value, many of these do not satisfy the final two criteria for general application within developing countries with limited resources.…”

Section: Introductionmentioning

confidence: 99%