chen IOD
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Transcript of chen IOD
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An Introduction to the Indian Ocean Dipole Zhuomin [email protected]
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What is IOD?First described by Dr. Saji et al. in 1999 Second mode of EOF, explains about 12% of the total variation of anomalous Indian Ocean sea-surface temperatures Dipole Mode Index (DMI)
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Evolution of a Dipole Mode EventAn IOD event usually starts around May or Jun, intensifies in the following months and peaks between Aug and Oct and then rapidly decays.
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Positive & Negative Phases of IOD
Positive: cooler in the tropical eastern Indian Ocean and warmer in the tropical western Indian OceanNegative: warmer in the tropical eastern Indian Ocean and cooler in the tropical western Indian Ocean
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IOD Influence on Surrounding ClimateA positive phase of the IOD tends to cause droughts in East Asia and Australia, and flooding in parts of the Indian subcontinent and East Africa.
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Australian droughtsA 2009 study by Ummenhofer et al. at the University of New South Wales Climate Change Research Centre, has demonstrated a significant correlation between the IOD and drought in the southern half of Australia, in particular the south-east.
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Floods in Kenya, Eastern Africa
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Preconditioned major wildfires in southeast AustraliaCaused coral reef death across western SumatraExacerbated malaria outbreaks in East Africa A better understanding of the relationship between the Indian Ocean Dipole and extreme weather eventsHowever many problems still remain unsolved. have not reached an agreement on how IOD formed;have questions about the relationship between ENSO and IOD;and how they affect the climate together More Effort Counts!Summary
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Thank you!