Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/joc.4936 |
Analysis of rainfall variability in the Logone catchment, Lake Chad basin | |
Nkiaka, E.; Nawaz, N. R.; Lovett, J. C. | |
2017-07-01 | |
发表期刊 | INTERNATIONAL JOURNAL OF CLIMATOLOGY |
ISSN | 0899-8418 |
EISSN | 1097-0088 |
出版年 | 2017 |
卷号 | 37期号:9 |
文章类型 | Article |
语种 | 英语 |
国家 | England |
英文摘要 | The socio-economic consequences posed by climate change in Africa are giving increasing emphasis to the need for trend analysis and detection of changes in hydro-climatic variables in data deficient areas. This study analyses rainfall data from 17 rain gauges unevenly distributed across the Logone catchment in the Lake Chad basin over a 50-year period (1951-2000). After quality control of the rainfall data using homogeneity tests, nonparametric Mann-Kendall and Spearman's rho tests were applied to detect the presence of trends. Trend magnitude was calculated using Sen's slope estimator. Results of the homogeneity test showed that rainfall was homogeneous across the catchment. Trend analysis revealed the presence of negative trends for annual rainfall at all the stations. Results of long-term trend analysis at a monthly time scale revealed the presence of statistically insignificant positive trends at 32% of the stations. Spatially, the analysis showed a clear distinction in rainfall magnitude between the semi-arid and Sudano zones. The slope of the trend lines for annual rainfall averaged over the respective zones was higher in the semi-arid zone (-4.37) compared to the Sudano zone (-4.02). However, the station with the greatest reduction in annual rainfall (-8.06 mm) was located in the Sudano zone. |
英文关键词 | rainfall analysis Mann-Kendall Sudano-Sahel Logone catchment Lake Chad basin |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000404854600003 |
WOS关键词 | SPATIOTEMPORAL VARIABILITY ; CLIMATE-CHANGE ; CENTRAL-AFRICA ; TRENDS ; PRECIPITATION ; TEMPERATURE ; SAHEL ; RIVER ; VEGETATION ; RECOVERY |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/36648 |
专题 | 气候变化 |
作者单位 | Univ Leeds, Sch Geog, Leeds, W Yorkshire, England |
推荐引用方式 GB/T 7714 | Nkiaka, E.,Nawaz, N. R.,Lovett, J. C.. Analysis of rainfall variability in the Logone catchment, Lake Chad basin[J]. INTERNATIONAL JOURNAL OF CLIMATOLOGY,2017,37(9). |
APA | Nkiaka, E.,Nawaz, N. R.,&Lovett, J. C..(2017).Analysis of rainfall variability in the Logone catchment, Lake Chad basin.INTERNATIONAL JOURNAL OF CLIMATOLOGY,37(9). |
MLA | Nkiaka, E.,et al."Analysis of rainfall variability in the Logone catchment, Lake Chad basin".INTERNATIONAL JOURNAL OF CLIMATOLOGY 37.9(2017). |
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