Trend analysis in reference evapotranspiration and aridity index in the context of climate change in Togo
Reference evapotranspiration is a key parameter in hydrological and meteorological studies and used to determine the actual water use rate for various crops. The objectives of this study were to explore trend in the grass-reference evapotranspiration (ETo) through years 1961–2011 and to identify tre...
| Autores principales: | , |
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| Formato: | Journal Article |
| Lenguaje: | Inglés |
| Publicado: |
IWA Publishing
2015
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| Acceso en línea: | https://hdl.handle.net/10568/76574 |
| _version_ | 1855543559552237568 |
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| author | Koffi D Komla G |
| author_browse | Koffi D Komla G |
| author_facet | Koffi D Komla G |
| author_sort | Koffi D |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Reference evapotranspiration is a key parameter in hydrological and meteorological studies and used to determine the actual water use rate for various crops. The objectives of this study were to explore trend in the grass-reference evapotranspiration (ETo) through years 1961–2011 and to identify trend in the aridity index as an indicator of change in climate in Togo. ETo was calculated using the FAO-56 Penman–Monteith method, and trends analyses were performed with non-parametric statistics proposed by Mann–Kendall and the Sen slope estimator. Results showed that annual ETo varied from 1,440 to 1,690 mm at Lomé, from 1,761 to 1,905 mm at Tabligbo, and from 1,839 to 1,990 mm at Sokode. The Mann–Kendall test revealed significant increase in annual ETo at Tabligbo (Z = 2.89) and Sokode (Z = 2.29). Annual ETo is much more stable at Lomé, with non-significant decrease. In Togo, according to the three study sites, the 1961–2011 period annual aridity index varied from 0.26 to 0.99 at Lomé, 0.38 to 0.98 at Tabligbo, and 0.45 to 1.08 at Sokode. The Mann–Kendall test revealed a declining trend in the ratio of precipitation/ETo which adversely implies an increasing severity of the aridity index at all the sites, prejudicial to rainfed agriculture practiced by about 90% of Togolese crop growers. |
| format | Journal Article |
| id | CGSpace76574 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2015 |
| publishDateRange | 2015 |
| publishDateSort | 2015 |
| publisher | IWA Publishing |
| publisherStr | IWA Publishing |
| record_format | dspace |
| spelling | CGSpace765742025-02-19T14:32:43Z Trend analysis in reference evapotranspiration and aridity index in the context of climate change in Togo Koffi D Komla G climate change agriculture food security Reference evapotranspiration is a key parameter in hydrological and meteorological studies and used to determine the actual water use rate for various crops. The objectives of this study were to explore trend in the grass-reference evapotranspiration (ETo) through years 1961–2011 and to identify trend in the aridity index as an indicator of change in climate in Togo. ETo was calculated using the FAO-56 Penman–Monteith method, and trends analyses were performed with non-parametric statistics proposed by Mann–Kendall and the Sen slope estimator. Results showed that annual ETo varied from 1,440 to 1,690 mm at Lomé, from 1,761 to 1,905 mm at Tabligbo, and from 1,839 to 1,990 mm at Sokode. The Mann–Kendall test revealed significant increase in annual ETo at Tabligbo (Z = 2.89) and Sokode (Z = 2.29). Annual ETo is much more stable at Lomé, with non-significant decrease. In Togo, according to the three study sites, the 1961–2011 period annual aridity index varied from 0.26 to 0.99 at Lomé, 0.38 to 0.98 at Tabligbo, and 0.45 to 1.08 at Sokode. The Mann–Kendall test revealed a declining trend in the ratio of precipitation/ETo which adversely implies an increasing severity of the aridity index at all the sites, prejudicial to rainfed agriculture practiced by about 90% of Togolese crop growers. 2015-12-01 2016-08-25T11:51:08Z 2016-08-25T11:51:08Z Journal Article https://hdl.handle.net/10568/76574 en Limited Access IWA Publishing Koffi D, Komla G. 2015. Trend analysis in reference evapotranspiration and aridity index in the context of climate change in Togo. Journal of Water and Climate Change 7(1). |
| spellingShingle | climate change agriculture food security Koffi D Komla G Trend analysis in reference evapotranspiration and aridity index in the context of climate change in Togo |
| title | Trend analysis in reference evapotranspiration and aridity index in the context of climate change in Togo |
| title_full | Trend analysis in reference evapotranspiration and aridity index in the context of climate change in Togo |
| title_fullStr | Trend analysis in reference evapotranspiration and aridity index in the context of climate change in Togo |
| title_full_unstemmed | Trend analysis in reference evapotranspiration and aridity index in the context of climate change in Togo |
| title_short | Trend analysis in reference evapotranspiration and aridity index in the context of climate change in Togo |
| title_sort | trend analysis in reference evapotranspiration and aridity index in the context of climate change in togo |
| topic | climate change agriculture food security |
| url | https://hdl.handle.net/10568/76574 |
| work_keys_str_mv | AT koffid trendanalysisinreferenceevapotranspirationandaridityindexinthecontextofclimatechangeintogo AT komlag trendanalysisinreferenceevapotranspirationandaridityindexinthecontextofclimatechangeintogo |