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The Malagasy monsoon over the Holocene: A review from speleothem d18Oc records

Abstract : Speleothem stable oxygen isotope records (d18Oc) are among fundamental proxies in paleoclimate reconstruction. Most generally, speleothem d18Oc reflects the d18Ow of the feeding drip water, which in turn is closely linked to the d18Ow of the water seeping into the cave that mainly originates from atmospheric precipitation. The d18O of atmospheric precipitation could in turn reflect the d18O of the vapor source (the “moisture source effect”), the distance of transport from the source (the ‘continent effect’ resulting from Rayleigh distillation), the amount of precipitation (the ‘amount effect’), and the atmospheric temperature during precipitation (the ‘temperature effect’). This chain of relationships between various components, from the cave to the atmosphere, could explain the strength of speleothems in recording reliable information about past climate. This paper reviews the potential of speleothem d18Oc from Anjohibe Cave, in NW Madagascar, to record information about its past climate, starting from reporting on the modern cave investigation on speleothem d18Oc, drip water d18Ow and temperature, to understanding the overall monsoonal behavior in the island, which is currently known as the driver of seasonality in Madagascar, mainly in its western part. It will also attempt to review the challenges in the interpretation of the records, that may rely on the uncertainties of radiometric dating and interpretations of the paleo-records that may be different from current environmental and climatic conditions.
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Contributor : Ny Riavo Voarintsoa Connect in order to contact the contributor
Submitted on : Wednesday, March 24, 2021 - 9:17:57 PM
Last modification on : Friday, March 26, 2021 - 3:08:35 AM


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  • HAL Id : hal-03180301, version 1



Ny Riavo Voarintsoa. The Malagasy monsoon over the Holocene: A review from speleothem d18Oc records. 2021. ⟨hal-03180301⟩



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