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Indian Ocean Dipole drives malaria resurgence in East African highlands


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Title: Indian Ocean Dipole drives malaria resurgence in East African highlands
Authors: Hashizume, Masahiro / Chaves, Luis Fernando / Minakawa, Noboru
Issue Date: 16-Feb-2012
Publisher: Nature Publishing Group
Citation: Scientific Reports, 2, an269; 2012
Abstract: Malaria resurgence in African highlands in the 1990s has raised questions about the underlying drivers of the increase in disease incidence including the role of El-Niño-Southern Oscillation (ENSO). However, climatic anomalies other than the ENSO are clearly associated with malaria outbreaks in the highlands. Here we show that the Indian Ocean Dipole (IOD), a coupled ocean-atmosphere interaction in the Indian Ocean, affected highland malaria re-emergence. Using cross-wavelet coherence analysis, we found four-year long coherent cycles between the malaria time series and the dipole mode index (DMI) in the 1990s in three highland localities. Conversely, we found a less pronounced coherence between malaria and DMI in lowland localities. The highland/lowland contrast can be explained by the effects of mesoscale systems generated by Lake Victoria on its climate basin. Our results support the need to consider IOD as a driving force in the resurgence of malaria in the East African highlands.
URI: http://hdl.handle.net/10069/28903
DOI: 10.1038/srep00269
Rights: This work is licensed under a Creative Commons Attribution-NonCommercial-ShareALike 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/3.0/
Type: Journal Article
Text Version: publisher
Appears in Collections:Articles in academic journal

Citable URI : http://hdl.handle.net/10069/28903

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