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Seeking cyclonic activity records in speleothems from central Pacific: preliminary sample screening

By Isabelle Couchoud, Samuel Etienne, Russell N. Drysdale, John C. Hellstrom, Christoph Spötl and Yves Perrette

Abstract

International audienceIdeal cyclone-sensitive speleothems would have the following properties: active at the time of sampling and recording the past few millenia, with fast growth rate, made of clean primary calcite, precipitated without kinetic fractionation, and fed by water with a short residence time allowing for the isotopic signal of short events like cyclones to be transferred but long enough for the drip water to be supersaturated. The screening for this type of speleothem is still in progress and the results presented here are very preliminary. U-Th dating: low U concentration (9-40ng/g; host rock is reef limestone) ; significant detrital content, involving large corrections and large final age uncertainties. Growth rate is highly variable, from ~0.12 mm/yr to ~0.03mm/yr. Tau12A: δ 18 O profile shows some quite large variations (~3‰), with several abrupt events that we will try to identify in other archives. δ 13 C signal amplitude is very large (~-4 to ~-14‰) suggesting the effect of prior calcite precipitation. The δ 18 O signal gets heavier when the δ 13 C does, which could reflect the rainfall amount in this context. Var12C: δ 18 O profile shows values between-3.1 and-6.3‰, with decadal or centennial fluctuations, superimposed on a general trend which is consistent with the one of the δ 13 C profile without being correlated, which implies that calcite precipitation could occur in conditions close to isotopic equilibrium. Once properly dated, this record should provide interesting information about past rainfall regimes on the island

Topics: station météorologique, activité cyclonique, spéléothème, Pacifique central, atoll, archipel des Australes, [ SHS.GEO ] Humanities and Social Sciences/Geography, [ SDU ] Sciences of the Universe [physics], [ SDU.OCEAN ] Sciences of the Universe [physics]/Ocean, Atmosphere, [ SDU.STU.ME ] Sciences of the Universe [physics]/Earth Sciences/Meteorology
Publisher: HAL CCSD
Year: 2014
DOI identifier: 10.1007/s00382-013-2035-y
OAI identifier: oai:HAL:hal-01261372v1
Provided by: Hal-Diderot

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