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Article Type:
Research Article

Comparing Satellite and Surface Rainfall Products over West Africa at Meteorologically Relevant Scales during the AMMA Campaign Using Error Estimates

Rémy Roca Laboratoire de Météorologie Dynamique, IPSL/CNRS, Paris, France

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Philippe Chambon Laboratoire de Météorologie Dynamique, IPSL/CNRS, Palaiseau, France

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Isabelle Jobard Laboratoire de Météorologie Dynamique, IPSL/CNRS, Palaiseau, France

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Pierre-Emmanuel Kirstetter Laboratoire ATMOS, IPSL/CNRS, Vélizy, France

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Marielle Gosset Laboratoire d’étude des Transferts en Hydrologie et Environnement, Grenoble, France

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Jean Claude Bergès PRODIG, Université Paris 1, Paris, France

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Print Publication:
01 Apr 2010
Collections:
International Precipitation Working Group (IPWG)
DOI:
https://doi.org/10.1175/2009JAMC2318.1
Page(s):
715–731
Restricted access

Abstract

Monsoon rainfall is central to the climate of West Africa, and understanding its variability is a challenge for which satellite rainfall products could be well suited to contribute to. Their quality in this region has received less attention than elsewhere. The focus is set on the scales associated with atmospheric variability, and a meteorological benchmark is set up with ground-based observations from the African Monsoon Multidisciplinary Analysis (AMMA) program. The investigation is performed at various scales of accumulation using four gauge networks. The seasonal cycle is analyzed using 10-day-averaged products, the synoptic-scale variability is analyzed using daily means, and the diurnal cycle of rainfall is analyzed at the seasonal scale using a composite and at the diurnal scale using 3-hourly accumulations. A novel methodology is introduced that accounts for the errors associated with the areal–time rainfall averages. The errors from both satellite and ground rainfall data are computed using dedicated techniques that come down to an estimation of the sampling errors associated to these measurements. The results show that the new generation of combined infrared–microwave (IR–MW) satellite products is describing the rain variability similarly to ground measurements. At the 10-day scale, all products reveal high regional and seasonal skills. The day-to-day comparison indicates that some products perform better than others, whereas all of them exhibit high skills when the spectral band of African easterly waves is considered. The seasonal variability of the diurnal scale as well as its relative daily importance is only captured by some products. Plans for future extensive intercomparison exercises are briefly discussed.

Corresponding author address: Dr. Rémy Roca, Laboratoire de Météorologie Dynamique, Tour 45-55, 3ème étage, Case Postale 99, 4 place Jussieu, 75252 Paris, CEDEX 05, France. Email: roca@lmd.jussieu.fr

This article included in the International Precipitation Working Group (IPWG) special collection.

Abstract

Monsoon rainfall is central to the climate of West Africa, and understanding its variability is a challenge for which satellite rainfall products could be well suited to contribute to. Their quality in this region has received less attention than elsewhere. The focus is set on the scales associated with atmospheric variability, and a meteorological benchmark is set up with ground-based observations from the African Monsoon Multidisciplinary Analysis (AMMA) program. The investigation is performed at various scales of accumulation using four gauge networks. The seasonal cycle is analyzed using 10-day-averaged products, the synoptic-scale variability is analyzed using daily means, and the diurnal cycle of rainfall is analyzed at the seasonal scale using a composite and at the diurnal scale using 3-hourly accumulations. A novel methodology is introduced that accounts for the errors associated with the areal–time rainfall averages. The errors from both satellite and ground rainfall data are computed using dedicated techniques that come down to an estimation of the sampling errors associated to these measurements. The results show that the new generation of combined infrared–microwave (IR–MW) satellite products is describing the rain variability similarly to ground measurements. At the 10-day scale, all products reveal high regional and seasonal skills. The day-to-day comparison indicates that some products perform better than others, whereas all of them exhibit high skills when the spectral band of African easterly waves is considered. The seasonal variability of the diurnal scale as well as its relative daily importance is only captured by some products. Plans for future extensive intercomparison exercises are briefly discussed.

Corresponding author address: Dr. Rémy Roca, Laboratoire de Météorologie Dynamique, Tour 45-55, 3ème étage, Case Postale 99, 4 place Jussieu, 75252 Paris, CEDEX 05, France. Email: roca@lmd.jussieu.fr

This article included in the International Precipitation Working Group (IPWG) special collection.

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