Indian Ocean Dipole index recorded in Kenyan coral annual density bands

Details Indian Ocean Dipole index recorded in Kenyan coral annual density bands Indian Ocean Dipole index recorded in Kenyan coral annual density bands

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3319709k&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 19, CiteID L19709

Physics

8

Biogeosciences: Paleoclimatology And Paleoceanography (3344, 4900), Paleoceanography: Corals (4220), Geochemistry: Stable Isotope Geochemistry (0454, 4870), Geographic Location: Indian Ocean, Atmospheric Processes: Ocean/Atmosphere Interactions (0312, 4504)

Scientific paper

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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