Title
Indian ocean dipole index recorded in Kenyan coral annual density bands
Author(s)
Kayanne H., Iijima H., Nakamura N., McClanahan T.R., Behera S., Yamagata T.
Published
2006
Publisher
Geophysical Research Letters
Published Version DOI
https://doi.org/10.1029/2006GL027168
Abstract
The Indian Ocean Dipole (IOD), which governs climate variability not only over the Indian Ocean but also globally, produces precipitation anomalies in the East African short rain period from October to November. These precipitation anomalies were recorded in annual bands from a coral core obtained in the Malindi Marine Park, Kenya. A signature of the IOD in precipitation was detected in the coral core by luminescence intensity under UV light and by oxygen isotope values dated to January, a few months after the short rain period. Anomalies of the oxygen isotope values correlated well with high and low precipitation, which were related to positive and negative IOD indices, respectively. This study suggests that the coral annual band record is effective for reconstructing IOD events and should be able to reconstruct the IOD record prior to instrumental observations. Copyright 2006 by the American Geophysical Union.
Keywords
Isotopes; Luminescence; Rain; Ultraviolet radiation; Indian ocean dipole (IOD); Instrumental observations; Luminescence intensity; Oceanography; anomaly; climate variation; coral record; index method; luminescence; oxygen isotope; precipitation intensity; reconstruction; ultraviolet radiation; Africa; Coast Province; East Africa; Indian Ocean; Kenya; Malindi Marine Park; Sub-Saharan Africa; Anthozoa

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