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Geographica Pannonica
2021, vol. 25, br. 1, str. 10-23
Mechanisms associated with September to November (SON) rainfall over Uganda during the recent decades
(naslov ne postoji na srpskom)
Ngoma Hamidaa, Wen Wangb, Ayugi Brianc, Karim Rizwanb, Kisesa Makula Exaveryd
aMinistry of Education (KLME), Nanjing University of Information Science and Technology, Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CICFEMD), Joint International Research Laboratory of Climate and Environment Change (ILCEC), Key Laboratory of Meteorological Disaster, Nanjing, China + Makerere University, Department of Geography, Geoinformatics and Climatic Sciences, Kampala, Uganda
bMinistry of Education (KLME), Nanjing University of Information Science and Technology, Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CICFEMD), Joint International Research Laboratory of Climate and Environment Change (ILCEC), Key Laboratory of Meteorological Disaster, Nanjing, China
cMinistry of Education (KLME), Nanjing University of Information Science and Technology, Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CICFEMD), Joint International Research Laboratory of Climate and Environment Change (ILCEC), Key Laboratory of Meteorological Disaster, Nanjing, China + Nanjing University of Information Science and Technology, School of Environmental Science and Engineering, Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Nanjing, China + Organization of African Academic Doctors (OAAD), Nairobi, Kenya
dMinistry of Education (KLME), Nanjing University of Information Science and Technology, Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CICFEMD), Joint International Research Laboratory of Climate and Environment Change (ILCEC), Key Laboratory of Meteorological Disaster, Nanjing, China + University of Dar es Salaam, Physics Department, Dar es Salaam, Tanzania

e-adresa: hamynads@gmail.com, wangwen@nuist.edu.cn, ayugi.o@gmail.com, rizwan555danyore@gmail.com, kisesaexavery@yahoo.com
Projekat:
The lead author is grateful to Ministry of Commerce of the People's Republic of China for the financial support

Ključne reči: Rainfall; Extreme; Circulation; Uganda; East Africa
Sažetak
(ne postoji na srpskom)
This study revisits teleconnections associated with the anomalous events of September to November (SON) rainfall over Uganda during 1981-2019, owing to the recent intensification of extreme events. Empirical Orthogonal Function (EOF), Composite and Correlation analysis are employed to examine the variability of SON rainfall over the study domain and associated circulations anomalies. The first EOF mode (dominant mode) displays a positive monopole pattern and explains 67.2% of the variance. The results revealed that SON rainfall is largely influenced by a Walker circulation mode over the Indian Ocean, whereby, wet events are associated with an ascending limb of the Walker circulation on the western part of the Indian Ocean characterized by convergence at low levels and divergence at upper level. The study showed that SON rainfall is positively (negatively) correlated with Indian Ocean (Atlantic Ocean) sea surface temperatures (SST). Furthermore, Indian Ocean Dipole (IOD) events have impact on SON rainfall with strong positive correlation, whereas Southern Oscillation Index (SOI) revealed negative correlation. The results also reveal that there is a lag in ENSO and IOD episodes during wet/dry events over the region. ENSO and IOD also tend to extend the rainfall season of SON and thus study of extreme events may not be well captured by studies focusing on SON. Future studies might consider the season of October to December or December to February. These phenomena need to be closely monitored and considered when making seasonal forecasts.
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O članku

jezik rada: engleski
vrsta rada: originalan članak
DOI: 10.5937/gp25-29932
primljen: 19.12.2020.
revidiran: 14.02.2021.
prihvaćen: 25.02.2021.
objavljen u SCIndeksu: 14.04.2021.
metod recenzije: dvostruko anoniman
Creative Commons License 4.0

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