Improving analytical method of Sr/Ca ratios in coral skeletons for paleo-SST reconstructions using ICP-OES

Takaaki K. Watanabe, Tsuyoshi Watanabe, Kazuto Ohmori, Atsuko Yamazaki

研究成果: Contribution to journalArticle査読

4 被引用数 (Scopus)

抄録

Strontium/calcium ratios (Sr/Ca) in reef coral skeletons have been used for sea surface temperature (SST) proxy. Because skeletons of reef corals are accumulated throughout more than 100 years, SST records from coral skeletons were important archives to reveal climate mechanisms. Here, we improved the coral Sr/Ca analytical method using an inductively coupled plasma optical emission spectrometer which method has advantages in terms of initial/running cost and analysis time. We checked variations of Sr and Ca sensitivities as increases of Ca concentrations using various wavelengths of Sr and Ca. Our results suggested that sensitivities of Sr/Ca in a range of coral skeletons were modulated by selections of wavelengths and sensitivity changes of Sr and Ca. A combination of Sr(421.5 nm) and Ca(373.6 nm) is stable for the Sr/Ca analysis at a low Ca concentration. A SD of Sr/Ca(421.5/373.6 nm) was 0.006 mmol mol−1 (1σ, n = 40) based on the replicate measurement of the reference material (JCp-1) using our new method. By applying a Porites colony from Kikai island, Japan, a precision of reconstructed SST was over ± 0.3°C at weekly resolution.

本文言語英語
ページ(範囲)297-310
ページ数14
ジャーナルLimnology and Oceanography: Methods
18
6
DOI
出版ステータス出版済み - 6 1 2020

All Science Journal Classification (ASJC) codes

  • 海洋工学

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