| Project/Area Number |
24651027
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Single-year Grants |
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| Research Field |
Environmental impact assessment/Environmental policy
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| Research Institution | Nagasaki University |
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Principal Investigator |
|
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| Project Period (FY) |
2012-04-01 – 2014-03-31
|
| Project Status |
Completed (Fiscal Year 2013)
|
| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2013: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2012: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Keywords | 疫学 / 気候変動 / マラリア / インド洋 / エルニーニョ / 時系列解析 / アフリカ / ケニア / インド洋ダイポール現象 / Wavelet解析 |
|---|
| Research Abstract |
The El-Nino-Southern Oscillation (ENSO) has been connected to malaria epidemics in the 1990s in the east African highlands. We show that the Indian Ocean Dipole (IOD), a coupled ocean-atmosphere interaction related to temperature changes 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), an indicator of the east-west temperature gradient across the tropical Indian Ocean, in the 1990s in three highland localities. Conversely, we found a less pronounced coherence between malaria and DMI in lowland localities. The differences between highland and lowland sites may reflect the effects of mesoscale systems generated by Lake Victoria on its climate basin and indicate the sensitivity of the local climate to a strong IOD.
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