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Variability of the Intertropical Convergence Zone recorded in coral isotopic records from the central indian Ocean (Chagos Archipelago)

Abstract

We have analyzed the stable oxygen isotopic composition of two Porites corals from the Chagos Archipelago, which is situated in the geographical center of the Indian Ocean. Coral δ18O at this site reliably records temporal variations in precipitation associated with the Intertropical Convergence Zone (ITCZ). Precipitation maxima occur in boreal winter, when the ITCZ forms a narrow band across the Indian Ocean. The Chagos then lies within the center of the ITCZ, and rainfall is strongly depleted in δ18O. A 120-yr coral isotopic record indicates an alternation of wet and dry intervals lasting 15 to 20 yr. The most recent 2 decades are dominated by interannual variability, which is tightly coupled to the El Niño–Southern Oscillation (ENSO). This is unprecedented in the 120 yr of coral record. As the ITCZ is governed by atmospheric dynamics, this provides evidence of a major change in the coupled ENSO–monsoon system.

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*Corresponding author. Fax: +49 (0)431 600 2941.E-mail address: mpfeiffer@ifm-geomar.de (M. Pfeiffer).
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C.D Charles , D.E Hunter , R.G Fairbanks , (1997). Interaction between the ENSO and the Asian Monsoon in a coral record of tropical climate. Science. 277, 925928.

J.E Cole , R.G Fairbanks , (1990). The Southern Oscillation recorded in the δ18O of corals from Tarawa Atoll. Paleoceanography. 5, 669683.

J.E Cole , R.B Dunbar , T.R McClanahan , N.A Muthiga , (2000). Tropical Pacific forcing of decadal SST variability in the western Indian Ocean over the past two centuries. Science. 287, 617619.

A Dai , T.M.L Wigley , (2000). Global patterns of ENSO-induced precipitation. Geophysical Research Letters. 27, 12831286.

W Dansgaard , (1964). Stable isotopes in precipitation. Tellus. 16, 436468.

G Delaygue , J Jouzel , J.-C Dutay , (2000). Oxygen 18-salinity relationship simulated by an oceanic general circulation model. Earth and Planetary Science Letters. 178, 113123.

A Juillet-Leclerc , J Jouzel , L Labeyrie , S Joussaume , (1997). Modern and last glacial maximum sea surface δ18O derived from an atmospheric general circulation model. Earth and Planetary Science Letters. 146, 591605.

A Juillet-Leclerc , G Schmidt , (2001). A calibration of the oxygen isotope paleothermometer of coral aragonite from Porites . Geophysical Research Letters. 28, 41354138.

A Kaplan , M.A Cane , Y Kushnir , A Clement , M Blumenthal , B Rajagopalan , (1998). Analysis of global sea surface temperature 1856–1992. Journal of Geophysical Research. 103, 1856718589.

K.K Kumar , B Rajagopalan , M.A Cane , (1999). On the weakening relationship between the Indian Monsoon and ENSO. Science. 284, 21562159.

R.S Lindzen , M.-D Chou , A.Y Hou , (2001). Does the Earth have an adaptive infrared iris?. Bulletin of the American Meteorological Society. 82, 417432.

B.K Linsley , R.B Dunbar , G.M Wellington , D.A Mucciarone , (1994). A coral-based reconstruction of Intertropical Convergence Zone variability over Central America since 1707. Journal of Geophysical Research. 99, 99779994.

D.E Parker , C.K Folland , M Jackson , (1995). Marine surface temperature: observed variations and data requirements. Climate Change. 31, 559600.

T.M Quinn , F.W Taylor , T.J Crowley , S.M Link , (1996). Evaluation of sampling resolution in coral stable isotope records: a case study using records from New Caledonia and Tarawa. Paleoceanography. 11, 529542.

T.M Quinn , T.J Crowley , F.W Taylor , C Henin , P Joannot , Y Join , (1998). A multicentury stable isotope record from a New Caledonia coral: interannual and decadal sea surface temperature variability in the southwest Pacific since 1657 A.D. Paleoceanography. 13, 412426.

V Ramanathan , W Collins , (1991). Thermodynamic regulation of ocean warming by cirrus clouds deduced from observations of the 1987 El Niño. Nature. 351, 2732.

R.W Reynolds , T.M Smith , (1994). Improved global sea surface temperature analysis using optimum interpolation. Journal of Climate. 7, 929948.

D.R Stoddart , (1971). Rainfall on Indian Ocean coral islands. Atoll Research 121.

C Torrence , G.P Compo , (1998). A practical guide to wavelet analysis. Bulletin of the American Meteorological Society. 79, 6178.

C Torrence , P.J Webster , (1999). Interdecadal changes in the ENSO–monsoon system. Journal of Climate. 12, 26792690.

K.E Trenberth , T.J Hoar , (1996). The 1990–1995 El Niño–Southern Oscillation event: longest on record. Geophysical Research Letters. 23, 5760.

A.W Tudhope , C.P Shimmield , C.P Chilcott , M Jebb , A.E Fallick , A.N Dalgleish , (1995). Recent changes in the far western equatorial Pacific and their relationship to the Southern Oscillation; oxygen isotope records from massive corals, Papua New Guinea. Earth and Planetary Science Letters. 136, 575590.

B Wang , S.-I An , (2001). Why the properties of El Niño changed during the late 1970s. Geophysical Research Letters. 28, 37093712.

P.J Webster , V.O Magaña , T.N Palmer , J Shukla , R.A Tomas , M Yanai , T Yasunari , (1998). Monsoons: processes, predictability, and the prospects for prediction. Journal of Geophysical Research. 103, 1445114510.

R.L Woodruff , R.J Slutz , R.L Jenne , P.M Steurer , (1987). A comprehensive ocean–atmosphere data set. Bulletin of the American Meteorological Society. 68, 12391250.

P Xie , P Arkin , (1996). Analyses of global monthly precipitation using gauge observations, satellite estimates, and numerical model predictions. Journal of Climate. 9, 840885.

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Quaternary Research
  • ISSN: 0033-5894
  • EISSN: 1096-0287
  • URL: /core/journals/quaternary-research
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