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Analysis of meteorological drought variability in Niger and its connection with climate indices.
- Source :
- Hydrological Sciences Journal/Journal des Sciences Hydrologiques; Jul2018, Vol. 63 Issue 8, p1203-1218, 16p
- Publication Year :
- 2018
-
Abstract
- Based on a three-month-scale standardized precipitation index (SPI-3) computed from the available rainfall data of 13 stations of Niger, meteorological drought trends, periodicities and the relationships with 10 oceanic-atmospheric variables were analysed using the Mann-Kendall test, continuous wavelet transform and cross-wavelet analysis, respectively. The results revealed a significant (p < 5%) increase in drought at five of the 13 stations. A common dominant drought periodicity of 2 years was found at all of the stations, whereas significant periodicities varied from 2 to 32 years at six stations. Among the considered climate indices, South Atlantic sea-surface temperature, Southern Oscillation Index, sea-level pressure, geopotential height and relative humidity from the Atlantic basin oscillated in anti-phase relative to the SPI-3 at an inter-annual to decadal time scale from 1960 to 1990. In this period, relative humidity from the Mediterranean basin and zonal wind oscillated in phase with the drought index. [ABSTRACT FROM AUTHOR]
- Subjects :
- DROUGHTS
METEOROLOGICAL precipitation
RAINFALL
CLIMATE change
CLIMATOLOGY
Subjects
Details
- Language :
- English
- ISSN :
- 02626667
- Volume :
- 63
- Issue :
- 8
- Database :
- Complementary Index
- Journal :
- Hydrological Sciences Journal/Journal des Sciences Hydrologiques
- Publication Type :
- Academic Journal
- Accession number :
- 131405284
- Full Text :
- https://doi.org/10.1080/02626667.2018.1489542