Scale-dependent effects of growth rate on temperature reconstruction in a marine biogenic carbonate

IF 4.8 1区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Ronald E. Thresher
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Abstract

Analyses of a temperature proxy—Mg/Ca ratios—in the calcitic skeletons of bamboo corals (Octocorallia: Keratoisididae and Mopseidae) show that the effects of ambient temperature and growth rate on Mg/Ca (and oxygen isotope ratios) differ depending on the scale of the analysis. At the whole-of-specimen scale, Mg/Ca ratios are canonically positively correlated with temperature and influenced by growth rate-dependent entrapment and diffusion. However, within specimens, Mg/Ca is much more steeply positive with temperature and correlates negatively with growth rate. Within specimens, the slope of the (Mg/Ca)/temperature relationship itself varies with growth rate, which is hypothesized to result from micro-scale shifts in the relative abundance of slow and fast growing crystal types that, in turn, differ in their affinity for Mg++. This variable slope critically affects proxy-based temperature reconstruction, can underlie frequent mis-matches in marine calcifiers between environmental records and proxy-based reconstructions, and suggests cautious application within-specimens of proxies developed and calibrated using geographic “core top” comparisons.
海洋生物碳酸盐中生长速率对温度重建的尺度依赖效应
对竹珊瑚(竹珊瑚科:角化珊瑚科和竹珊瑚科)钙化骨骼中的温度代用物- Mg/Ca比值的分析表明,环境温度和生长速度对Mg/Ca(和氧同位素比值)的影响因分析规模的不同而不同。在整个样品尺度上,Mg/Ca比值与温度呈正相关,并受生长速率依赖的捕获和扩散的影响。然而,在样品内,Mg/Ca与温度呈显著正相关,与生长速率呈负相关。在样品内,(Mg/Ca)/温度关系本身的斜率随生长速率而变化,假设这是由于慢速和快速生长晶体类型相对丰度的微观变化造成的,而慢速和快速生长晶体类型对Mg++的亲和力不同。这种变化的斜率严重影响了基于代理的温度重建,可能导致环境记录与基于代理的重建之间海洋钙化物的频繁不匹配,并建议在使用地理“核心顶部”比较开发和校准的代理样本中谨慎应用。
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来源期刊
Earth and Planetary Science Letters
Earth and Planetary Science Letters 地学-地球化学与地球物理
CiteScore
10.30
自引率
5.70%
发文量
475
审稿时长
2.8 months
期刊介绍: Earth and Planetary Science Letters (EPSL) is a leading journal for researchers across the entire Earth and planetary sciences community. It publishes concise, exciting, high-impact articles ("Letters") of broad interest. Its focus is on physical and chemical processes, the evolution and general properties of the Earth and planets - from their deep interiors to their atmospheres. EPSL also includes a Frontiers section, featuring invited high-profile synthesis articles by leading experts on timely topics to bring cutting-edge research to the wider community.
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