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فیزیک زمین و فضا، جلد ۴۱، شماره ۴، صفحات ۱۴۱-۱۴۹
عنوان فارسی Investigation of the atmospheric circulation anomalies associated with extreme rainfall events over the Coastal West Africa
چکیده فارسی مقاله 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.
کلیدواژه‌های فارسی مقاله Drought، Rainfall، West Africa، Variability،
عنوان انگلیسی Investigation of the atmospheric circulation anomalies associated with extreme rainfall events over the Coastal West Africa
چکیده انگلیسی مقاله 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.
کلیدواژه‌های انگلیسی مقاله Drought, Rainfall, West Africa, Variability
نویسندگان مقاله kpaikpai batebana |
assistant lecturer, college of atmospheric sciences, nanjing university of information science and technology, nanjing, jiangsu, china

bob علی ogwang | alex ogwang
assistant lecturer, uganda national meteorological authority, kampala, uganda

zin سوسن سوسن sein | mie mie sein
assistant lecturer, department of meteorology and hydrology, myanmar

faustin katchele ogou | katchele ogou
assistant lecturer, college of atmospheric sciences, nanjing university of information science and technology, nanjing, jiangsu, china

ویکتور ongoma |
assistant lecturer, department of meteorology, south eastern kenya university, kitui, kenya

ژان پل ngarukiyimana | jean paul
assistant lecturer, college of atmospheric sciences, nanjing university of information science and technology, nanjing, jiangsu, china

نشانی اینترنتی https://jesphys.ut.ac.ir/article_55173_ddba18929909116d455fc3e9947d5d34.pdf
فایل مقاله اشکال در دسترسی به فایل - ./files/site1/rds_journals/1035/article-1035-205447.pdf
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