Batebana, K. and Ogwang, Bob and Sein, M.M.Z. and Ogou, F.K. and Ongoma, Victor and Ngarukiyimana, Jean (2016) Investigation of the atmospheric circulation anomalies associated with extreme rainfall events over the coastal West Africa. Journal of the Earth and Space Physics, 41 (4). pp. 141-149. ISSN 0378-1046
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Abstract
This study investigates the atmospheric circulation associated with extreme rainfall events over the coastal West Africa. The rainfall data of this study were obtained from the Global Precipitation Climatology Centre (GPCC), spanning from 1981 to 2010. The atmospheric datasets were also obtained from the ERA-Interim reanalysis. The study employed the Z-Index to categorize dry and wet years into seven distinct grades. The
analyses focused on the summer monsoon rainfall season experienced in July to September (JAS). The extreme drought years were identified to be 1982 and 1983, while
extreme wet years were pointed out to be 1999 and 2007. The area of study was dominated by anomalous westerly moisture transport, characterized by convergence at
low level during wet years. The major source of moisture over the study area is Atlantic Ocean. Dry and wet years are characterized by positive and negative low-level
geopotential height anomalies, respectively. Although the results of this study do not give a diagnosis of the reported rainfall variability, the information herein can be useful in the monitoring and update of seasonal forecasts. Accurate and reliable seasonal forecasting is beneficial in that it helps us minimize loss of lives and destruction of property.
| Item Type: | Journal Article |
|---|---|
| Subjects: | G Geography. Anthropology. Recreation > G Geography (General) G Geography. Anthropology. Recreation > GB Physical geography |
| Divisions: | Faculty of Science, Technology and Environment (FSTE) > School of Geography, Earth Science and Environment |
| Depositing User: | Victor Ongoma |
| Date Deposited: | 18 Apr 2019 03:09 |
| Last Modified: | 18 Apr 2019 03:09 |
| URI: | https://repository.usp.ac.fj/id/eprint/11480 |
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