Malaria epidemics and the influence of the tropical South Atlantic on the Indian monsoon


Cash, BA; Rodo, X; Ballester, J; Bouma, MJ; Baeza, A; Dhiman, R; Pascual, M; (2013) Malaria epidemics and the influence of the tropical South Atlantic on the Indian monsoon. Nature climate change, 3 (5). pp. 502-507. ISSN 1758-678X DOI: https://doi.org/10.1038/NCLIMATE1834

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Abstract

The existence of predictability in the climate system beyond the relatively short timescales of synoptic weather(1,2) has provided significant impetus to investigate climate variability and its consequences for society. In particular, relationships between the relatively slow changes in sea surface temperature (SST) and climate variability at widely removed points across the globe provide a basis for statistical and dynamical efforts to predict numerous phenomena, from rainfall to disease incidence, at seasonal to decadal timescales. We describe here a remote influence, identified through observational analysis and supported through numerical experiments with a coupled atmosphere-ocean model, of the tropical South Atlantic (TSA) on both monsoon rainfall and malaria epidemics in arid northwest India. Moreover, SST in the TSA is shown to provide the basis for an early warning of anomalous hydrological conditions conducive to malaria epidemics four months later, therefore at longer lead times than those afforded by rainfall. We find that the TSA is not only significant as a modulator of the relationship between the monsoon and the El Nino/Southern Oscillation, as has been suggested by previous work(3,4), but for certain regions and temporal lags is in fact a dominant driver of rainfall variability and hence malaria outbreaks.

Item Type: Article
Keywords: sea-surface temperature, summer monsoon, climate, enso, cholera, variability, rainfall, ocean, oscillation, bangladesh
Faculty and Department: Faculty of Public Health and Policy > Dept of Social and Environmental Health Research
Research Centre: Malaria Centre
Web of Science ID: 319402000018
URI: http://researchonline.lshtm.ac.uk/id/eprint/1105268

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