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Satelliterainfall estimates have predominantly been used for climate impact studies dueto poor rain gauge network in sub-Saharan Africa. However, there are limitedmicroscale studies within the sub-region that have assessed the performance ofthese satellite products, which is the focus of the present study. This papertherefore considers validation of Tropical Rainfall Measuring Mission TRMMand Famine Early Warning System FEWS satellite estimates with rain gaugemeasurements over Ashanti region of Ghana. First, a consistency assessment ofthe two gauge data products, the Automatic Rain Gauge ARG and GhanaMeteorological Agency GMet Standard Rain Gauge SRG measurements, wasperformed. This showed a very good agreement with correlation coefficient of0.99. Secondly, satellite rainfall products from TRMM and FEWS were validatedwith the two gauge measurements. Validation results showed good agreement withcorrelation coefficients of 0.6 and 0.7 for TRMM and FEWS with SRG, and 0.87 and0.86 for TRMM and FEWS with ARG respectively. Probability Of Detection PODand Volumetric Hit Index VHI were found to be greater than 0.9. VolumetricCritical Success Index VCSI was 0.9 and 0.8 for TRMM and FEWS respectivelywith low False Alarm Ratio FAR and insignificant Volumetric Miss Index VMI.In general, relatively low biases and RMSE values were observed. The biaseswere less than 1.3 and 0.8 for TRMM and FEWS-RFE respectively. These indicatehigh rainfall detection capabilities of both satellite products. In addition,both TRMM and FEWS were able to capture the onset, peak and cessation of therainy season, as well as the dry spells. Although TRMM and FEWS sometimesunder-overestimated rainfall, they have the potential to be used for agriculturaland other hydro-climatic impact studies over the region. The Dynamic-Aerosol-Cloud-ChemistryInteractions in West Africa DACCIWA project will provide an improved spatialgauge network database over the study area to enhance future validation andother climate impact studies.

KEYWORDS

Rain Gauge, Validation, TRMM and FEWS-RFE, DACCIWA Project, Ashanti Region

Cite this paper

Amekudzi, L. , Osei, M. , Atiah, W. , Aryee, J. , Ahiataku, M. , Quansah, E. , Preko, K. , Danuor, S. and Fink, A. 2016 Validation of TRMM and FEWS Satellite Rainfall Estimates with Rain Gauge Measurement over Ashanti Region, Ghana. Atmospheric and Climate Sciences, 6, 500-518. doi: 10.4236-acs.2016.64040.





Autor: Leonard K. Amekudzi1*, Marian A. Osei1, Winifred A. Atiah1, Jeffrey N. A. Aryee1, Maureen A. Ahiataku1,2, Emmanuel Quansah1, Kwas

Fuente: http://www.scirp.org/



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