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Recent Advances in Coral Biomineralization with Implications for Paleo-Climatology: A Brief Overview

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Title: Recent Advances in Coral Biomineralization with Implications for Paleo-Climatology: A Brief Overview
Authors: Watanabe, Tsuyoshi Browse this author →KAKEN DB
Juillet-Leclerc, Anne Browse this author
Cuif, Jean-Pierre Browse this author
Rollion-Bard, Claire Browse this author
Dauphin, Yannicke Browse this author
Reynaud, Stéphanie Browse this author
Issue Date: 2007
Publisher: Elsevier
Journal Title: Elsevier oceanography series
Volume: 73
Start Page: 239
End Page: 254, 495
Publisher DOI: 10.1016/S0422-9894(06)73010-0
Abstract: The tropical oceans drive climatic phenomena such as the El Niño-southern oscillation (ENSO) and the Asian–Australian monsoon, which have global scale impacts. In order to understand future climatic developments, it is essential to understand how the tropical climate has developed in the past, on both short and longer timescales. However, good instrumental records are limited to the last few decades. The oxygen isotopic (δ18O) composition and strontium/calcium (Sr/Ca) ratio of massive corals have been widely used as proxies for past changes in sea surface temperature (SST) of the tropical and subtropical oceans, because the geochemistry of the skeleton is believed to vary as a function of several environmental parameters (such as seawater temperature, salinity, light, …). However, recent microanalytical studies have revealed large amplitude variations in Sr/Ca and oxygen isotopic composition in coral skeletons; variations that cannot be ascribed to changes in SST or in salinity. Such micro- and nanometer scale studies of geochemical variations in coral skeletons are still few and somewhat scattered in terms of the species studied and the problems addressed. But collectively they show the great potential for determining chemical variations at length scales of direct relevance to the biomineralization process. For example, it is now possible to measure geochemical variations within the two basic, micrometer-sized building blocks of the coral skeleton: Early mineralization zones (EMZ) and aragonite fibres. Such micro- and nanometer scale observations, in combination with controlled laboratory culturing of corals, hold the promise of yielding important new insights into the various biomineralization processes that may affect the chemical and isotopic composition of the skeletons. One aim of these efforts is to better understand the elemental and isotopic fractionation mechanisms in order to improve the conversion of the geochemical variability into environmental changes.
Type: article (author version)
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 渡邊 剛

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