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contributor authorHenry K. Ntale
contributor authorThian Yew Gan
date accessioned2017-05-08T21:23:45Z
date available2017-05-08T21:23:45Z
date copyrightJuly 2004
date issued2004
identifier other%28asce%291084-0699%282004%299%3A4%28257%29.pdf
identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/49785
description abstractBy applying harmonic analysis to El Niño–Southern Oscillation (ENSO) composites of the 6-month Standardized Precipitation Index (SPI) and rainfall anomalies for the 1900–1996 period, and based on the 90% confidence limits established from bootstrap resampling, it was found that ENSO responses in East African rainfall are region and season dependent, and the influence of El Niño is stronger and opposite that of La Niña. Among five regions of unique ENSO responses identified, northeastern (R4) and southern Tanzania (R5) seem to have the most consistent (in terms of vector coherence, percentage of variance extracted by the first harmonic, and SPI magnitude) ENSO responses. R5 experiences positive (negative) response under La Niña (El Niño) influence during January and June of the post-ENSO year. Southern Uganda and much of the Lake Victoria basin show some significant positive ENSO response for November, December, and January. The temporal and regional patterns of ENSO response periods were also analyzed using the index time series and boxplots on the 6-month SPI. Boxplots confirm a shift in the distribution of 6-month SPI between ENSO and non-ENSO affected seasons.
publisherAmerican Society of Civil Engineers
titleEast African Rainfall Anomaly Patterns in Association with El Niño/Southern Oscillation
typeJournal Paper
journal volume9
journal issue4
journal titleJournal of Hydrologic Engineering
identifier doi10.1061/(ASCE)1084-0699(2004)9:4(257)
treeJournal of Hydrologic Engineering:;2004:;Volume ( 009 ):;issue: 004
contenttypeFulltext


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