Characteristics of Lake Chad Level Variability and Links to ENSO, Precipitation, and River Discharge
Joint Authors
Demoz, Belay
Okonkwo, Churchill
Tesfai, Sium
Source
Issue
Vol. 2014, Issue 2014 (31 Dec. 2014), pp.1-13, 13 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2014-11-27
Country of Publication
Egypt
No. of Pages
13
Main Subjects
Medicine
Information Technology and Computer Science
Abstract EN
This study used trend, correlation, and wavelet analysis to characterize Lake Chad (LC) level fluctuations, river discharge, El Niño Southern Oscillation (ENSO), and precipitation regimes and their interrelationships.
Linear correlation results indicate a negative association between ENSO and LC level, river discharge and precipitation.
Trend analysis shows increasing precipitation in the Lake Chad Basin (LCB) but decreasing LC level.
The mode of interannual variability in LC level, rainfall, and ENSO analyzed using wavelet analysis is dominated by 3-4-year periods.
Results show that variability in ENSO could explain only 31% and 13% of variations in LC level at Kindjeria and precipitation in the northern LCB, respectively.
The wavelet transform coherency (WTC) between LC level of the southern pool at Kalom and ENSO is statistically significant at the 95% confidence level and phase-locked, implying a cause-and-effect association.
These strong coherencies coincide with the La Niña years with the exception of 1997-1998 El Niño events.
The WTC shows strong covariance between increasing precipitation and LC level in the northern pool at a 2- to 4-year band and 3- to 4-year band localized from 1996 to 2010.
Implications for water resource planning and management are discussed.
American Psychological Association (APA)
Okonkwo, Churchill& Demoz, Belay& Tesfai, Sium. 2014. Characteristics of Lake Chad Level Variability and Links to ENSO, Precipitation, and River Discharge. The Scientific World Journal،Vol. 2014, no. 2014, pp.1-13.
https://search.emarefa.net/detail/BIM-1048465
Modern Language Association (MLA)
Okonkwo, Churchill…[et al.]. Characteristics of Lake Chad Level Variability and Links to ENSO, Precipitation, and River Discharge. The Scientific World Journal No. 2014 (2014), pp.1-13.
https://search.emarefa.net/detail/BIM-1048465
American Medical Association (AMA)
Okonkwo, Churchill& Demoz, Belay& Tesfai, Sium. Characteristics of Lake Chad Level Variability and Links to ENSO, Precipitation, and River Discharge. The Scientific World Journal. 2014. Vol. 2014, no. 2014, pp.1-13.
https://search.emarefa.net/detail/BIM-1048465
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1048465