Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3623708n&link_type=abstract
Geophysical Research Letters, Volume 36, Issue 23, CiteID L23708
Physics
1
Oceanography: General: Climate And Interannual Variability (1616, 1635, 3305, 3309, 4513), Paleoceanography: Corals (4220), Geographic Location: Indian Ocean, Paleoceanography: Sea Surface Temperature, Oceanography: Physical: Enso (4922)
Scientific paper
A 115-year coral record from Kenya has been found to preserve the history of rainfall anomalies in East Africa in relation to global warming-induced Indian Ocean Dipole (IOD) variability. The coral IOD index demonstrates a dominantly decadal periodicity in the early part of the 20th century. This low-frequency IOD occurred more frequently before 1924 with mostly quasi-biennial ranging from 18 months to 3 years events since 1960. The mode shift has also coincided with an intensified coupling with Indian summer monsoon rainfall. We suggest that a warming of the western Indian Ocean, which has attenuated and replaced the El Niño/Southern Oscillation effect over the Indian Ocean, has driven the observed shift.
Behera Swadhin K.
Iijima Hiroko
Kayanne Hajime
McClanahan Timothy R.
Nakamura Nobuko
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