Indian Ocean Dipole index recorded in Kenyan coral annual density bands
Kayanne, H.; Iijima, H.; Nakamura, N.; McClanahan, T. R.; Behera, S.; Yamagata, T. (2006). Indian Ocean Dipole index recorded in Kenyan coral annual density bands. Geophys. Res. Lett. 33(19). dx.doi.org/10.1029/2006GL027168
In: Geophysical Research Letters. American Geophysical Union: Washington. ISSN 0094-8276; e-ISSN 1944-8007, more
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| Keywords |
Animal products > Coral
Marine/Coastal |
| Author keywords |
Corals, Indian Ocean, ocean/atmosphere interactions, paleoclimatology and paleoceanography, stable isotope geochemistry |
| Authors | | Top |
- Kayanne, H.
- Iijima, H.
- Nakamura, N.
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- McClanahan, T. R.
- Behera, S.
- Yamagata, T.
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| 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. |
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