Evaluation of clumped isotope thermometry using coral skeleton

Abstract

Clumped isotope thermometry, which means doubly-substituted isotopologue concentration in carbonate minerals, is a promising tool for reconstructing past water temperature change. Here we evaluate this thermometry using coral skeletons of 1) same genus grown in various temperature and 2) various genus (various skeletal growth rates) in same temperature. A negative correlation between 13C-18O clumping and water temperature is found with corals collected from 5 different locations between Iriomote and Tsushima. We will introduce these results also with relationship between skeletal growth rates and water temperature using various coral genus.