DOI: 10.2166/wcc.2015.111
论文题名: Trend analysis in reference evapotranspiration and aridity index in the context of climate change in Togo
作者: Koffi D. ; Komla G.
刊名: Journal of Water and Climate Change
ISSN: 20402244
出版年: 2015
卷: 6, 期: 4 起始页码: 848
结束页码: 864
语种: 英语
英文关键词: Aridity index
; Mann–Kendall and Sen slope estimator
; Reference evapotranspiration
; Togo
英文摘要: 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 ¼ 2.89) and Sokode (Z ¼ 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/ETowhich 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. © IWA Publishing 2015. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/67664
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Africa Rice Center, Sahel Regional Station, BP 96, St-Louis, Senegal; Institut Togolais de la Recherche Agricole (ITRA), BP 2318, Lome, Togo
Recommended Citation:
Koffi D.,Komla G.. Trend analysis in reference evapotranspiration and aridity index in the context of climate change in Togo[J]. Journal of Water and Climate Change,2015-01-01,6(4)