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Open AccessArticle

Validation of Satellite and Merged Rainfall Data over Ghana, West Africa

Meteorology and Climate Science Unit, Department of Physics, Kwame Nkrumah University of Science and Technology (KNUST), UPO-PMB Kumasi, Ghana
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Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Atmosphere 2020, 11(8), 859; https://doi.org/10.3390/atmos11080859
Received: 30 March 2020 / Revised: 15 May 2020 / Accepted: 20 May 2020 / Published: 14 August 2020
(This article belongs to the Special Issue Precipitation Observations)
In regions of sparse gauge networks, satellite rainfall products are mostly used as surrogate measurements for various rainfall impact studies. Their potential to complement rain gauge measurements is influenced by the uncertainties associated with them. This study evaluates the performance of satellites and merged rainfall products over Ghana in order to provide information on the consistency and reliability of such products. Satellite products were validated with gridded rain gauge data from the Ghana Meteorological Agency (GMet) on various time scales. It was observed that the performance of the products in the country are mostly scale and location dependent. In addition, most of the products showed relatively good skills on the seasonal scale (r > 0.90) rather than the annual, and, after removal of seasonality from the datasets, except ARC2 that had larger biases in most cases. Again, all products captured the onsets, cessations, and spells countrywide and in the four agro-ecological zones. However, CHIRPS particularly revealed a better skill on both seasonal and annual scales countrywide. The products were not affected by the number of gauge stations within a grid cell in the Forest and Transition zones. This study, therefore, recommends all products except ARC2 for climate impact studies over the region. View Full-Text
Keywords: validation; satellite; merged products; rainfall; Ghana validation; satellite; merged products; rainfall; Ghana
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MDPI and ACS Style

Atiah, W.A.; Amekudzi, L.K.; Aryee, J.N.A.; Preko, K.; Danuor, S.K. Validation of Satellite and Merged Rainfall Data over Ghana, West Africa. Atmosphere 2020, 11, 859.

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