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| Titel |
Comparison of drought indicators derived from multiple data sets over Africa |
| VerfasserIn |
G. Naumann, E. Dutra, P. Barbosa, F. Pappenberger, F. Wetterhall, J. V. Vogt |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 18, no. 5 ; Nr. 18, no. 5 (2014-05-07), S.1625-1640 |
| Datensatznummer |
250120347
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| Publikation (Nr.) |
 copernicus.org/hess-18-1625-2014.pdf |
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| Zusammenfassung |
Drought monitoring is a key component to mitigate impacts of droughts. Lack
of reliable and up-to-date precipitation data sets is a common challenge
across the globe. This study investigates different data sets and drought
indicators on their capability to improve drought monitoring in Africa. The
study was performed for four river basins located in different climatic
regions (the Oum er-Rbia in Morocco, the Blue Nile in eastern Africa, the
Upper Niger in western Africa, and the Limpopo in southeastern Africa) as
well as the Greater Horn of Africa.
The five precipitation data sets compared are the ECMWF ERA-Interim reanalysis,
the Tropical Rainfall Measuring Mission satellite monthly
rainfall product 3B-43, the Global Precipitation Climatology Centre
gridded precipitation data set, the Global Precipitation Climatology Project Global
Monthly Merged Precipitation Analyses, and the Climate Prediction Center Merged Analysis of Precipitation. The set of drought
indicators used includes the Standardized Precipitation Index, the
Standardized Precipitation-Evaporation Index, and Soil Moisture Anomalies.
A comparison of the annual cycle and monthly precipitation time series shows
a good agreement in the timing of the rainy seasons. The main differences
between the data sets are in the ability to represent the magnitude of the
wet seasons and extremes. Moreover, for the areas affected by drought, all
the drought indicators agree on the time of drought onset and recovery
although there is disagreement on the extent of the affected area. In
regions with limited rain gauge data the estimation of the different drought
indicators is characterized by a higher uncertainty. Further comparison
suggests that the main source of differences in the computation of the
drought indicators is the uncertainty in the precipitation data sets rather
than the estimation of the distribution parameters of the drought
indicators. |
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