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Batebana, Kpaikpai, Alex Ogwang, Bob, Mie Mie Sein, Zin, Katchele Ogou, Faustin, Ongoma, Victor, Ngarukiyimana, Jean Paul. (1394). Investigation of the atmospheric circulation anomalies associated with extreme rainfall events over the Coastal West Africa. , 41(4), 141-149. doi: 10.22059/jesphys.2015.55173
Kpaikpai Batebana; Bob Alex Ogwang; Zin Mie Mie Sein; Faustin Katchele Ogou; Victor Ongoma; Jean Paul Ngarukiyimana. "Investigation of the atmospheric circulation anomalies associated with extreme rainfall events over the Coastal West Africa". , 41, 4, 1394, 141-149. doi: 10.22059/jesphys.2015.55173
Batebana, Kpaikpai, Alex Ogwang, Bob, Mie Mie Sein, Zin, Katchele Ogou, Faustin, Ongoma, Victor, Ngarukiyimana, Jean Paul. (1394). 'Investigation of the atmospheric circulation anomalies associated with extreme rainfall events over the Coastal West Africa', , 41(4), pp. 141-149. doi: 10.22059/jesphys.2015.55173
Batebana, Kpaikpai, Alex Ogwang, Bob, Mie Mie Sein, Zin, Katchele Ogou, Faustin, Ongoma, Victor, Ngarukiyimana, Jean Paul. Investigation of the atmospheric circulation anomalies associated with extreme rainfall events over the Coastal West Africa. , 1394; 41(4): 141-149. doi: 10.22059/jesphys.2015.55173

Investigation of the atmospheric circulation anomalies associated with extreme rainfall events over the Coastal West Africa

فیزیک زمین و فضا
مقاله 14، دوره 41، شماره 4، دی 1394، صفحه 141-149    اصل مقاله (1.75 M)
شناسه دیجیتال (DOI): 10.22059/jesphys.2015.55173
نویسندگان
Kpaikpai Batebana1؛ Bob Alex Ogwang2؛ Zin Mie Mie Sein3؛ Faustin Katchele Ogou1؛ Victor Ongoma* 4؛ Jean Paul Ngarukiyimana1
1Assistant Lecturer, College of Atmospheric Sciences, Nanjing University of Information Science and Technology, Nanjing, Jiangsu, China
2Assistant Lecturer, Uganda National Meteorological Authority, Kampala, Uganda
3Assistant Lecturer, Department of Meteorology and Hydrology, Myanmar
4Assistant Lecturer, Department of Meteorology, South Eastern Kenya University, Kitui, Kenya
چکیده
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.
کلیدواژه‌ها
Drought؛ Rainfall؛ West Africa؛ Variability
عنوان مقاله [English]
Investigation of the atmospheric circulation anomalies associated with extreme rainfall events over the Coastal West Africa
نویسندگان [English]
Kpaikpai Batebana1؛ Bob Alex Ogwang2؛ Zin Mie Mie Sein3؛ Faustin Katchele Ogou1؛ Victor Ongoma4؛ Jean Paul Ngarukiyimana1
1Assistant Lecturer, College of Atmospheric Sciences, Nanjing University of Information Science and Technology, Nanjing, Jiangsu, China
2Assistant Lecturer, Uganda National Meteorological Authority, Kampala, Uganda
3Assistant Lecturer, Department of Meteorology and Hydrology, Myanmar
4Assistant Lecturer, Department of Meteorology, South Eastern Kenya University, Kitui, Kenya
چکیده [English]
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.
کلیدواژه‌ها [English]
Drought, Rainfall, West Africa, Variability
مراجع
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