气候变化领域集成服务门户(CCPortal): Geochemical proxies for deep-sea temperature and nutrient content in cold-water bamboo corals

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DOI	10.1016/j.chemgeo.2024.122053
	Geochemical proxies for deep-sea temperature and nutrient content in cold-water bamboo corals
	Williams, Thomas J.; Standish, Christopher D.; Archambault, Philippe; Godbold, Jasmin A.; Solan, Martin; Katsamenis, Orestis L.; Basford, Philip J.; Foster, Gavin L.
发表日期	2024
ISSN	0009-2541
EISSN	1872-6836
起始页码	654
卷号	654
英文摘要	The impact of warming, acidification, and deoxygenation on deep-sea environments is a growing concern. Historical records are sparse, particularly at high latitudes, making climate change projections challenging. Indirect proxies, such as trace element composition of marine carbonates, such as coral skeletons, can offer an alternative method to fill data gaps but have not been realised. Here, using Laser Ablation Triple-Quadrupole Inductively Coupled Plasma Mass Spectrometry (LA-QQQ-ICP-MS), we examined micrometre-scale element variation within and between individual colonies of the bamboo coral Keratoisis sp. obtained from the Eastern Canadian Arctic. These data are used to assess the influence of biological variability on geochemical tracers for reconstructing past environmental conditions (temperature: Mg/Ca, Li/Mg, Sr/Ca, Ba/Ca, U/Ca; [Ba](SW): Ba/Ca). We place these data into context, based on a survey of literature data, using refined calibrations for high-Mg calcitic Octocorals. We find reproducible (2 sigma relative coefficient of variation) values of Mg/Ca (3%) and Ba/Ca (6%) along the radial growth axis of all colonies and internodes of Keratoisis sp., indicating that these signals are likely suitable for environmental reconstructions. After revising the available multi-taxa calibrations for Mg/Ca (0.316 +/- 0.026 degrees C/mmol/mol, R-2 = 0.87, p < 0.001) and Ba/Ca ([Ba/Ca mu mol/mol] = 0.148 +/- 0.005 [Ba-SW nmol/kg], R-2 = 0.97, p < 0.001), we show that vital effects within and among Keratoisis sp. colonies strongly influence reconstructed temperature and [Ba](SW), but this can be somewhat mitigated by combining multiple internode transects from one colony into a single composite series. Despite the ontogenetic variability, all colonies reveal a gradual deep-water cooling trend since the early 21st century and synchronised, multi-year spikes in Ba/Ca (and hence [Ba](SW)) that suggest substantial and coherent barium inputs to the seafloor. Our study confirms the reliability of Mg/Ca and Ba/Ca proxies in high-Mg bamboo corals for detecting multi-annual temperature and seawater barium variations in cold-water environments, but further investigation into micro-scale element behaviour influenced by biotic processes in these corals is needed to enhance confidence in reconstructions at finer spatial and temporal resolutions. We conclude that employing empirical calibrations based on multi-taxa approaches can increase the certainty of capturing regional changes in the environment more accurately than a single species calibration, while leveraging multiple element series to account for biological-induced variability improves single colony reconstructions.
英文关键词	Paleoclimatology; High-Mg calcites; Bamboo coral; Inter-colony variability; Intra-individual variability; Cold-water corals; Geochemistry
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:001219360400001
来源期刊	CHEMICAL GEOLOGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/306428
作者单位	NERC National Oceanography Centre; University of Southampton; Laval University; University of Southampton
推荐引用方式 GB/T 7714	Williams, Thomas J.,Standish, Christopher D.,Archambault, Philippe,et al. Geochemical proxies for deep-sea temperature and nutrient content in cold-water bamboo corals[J],2024,654.
APA	Williams, Thomas J..,Standish, Christopher D..,Archambault, Philippe.,Godbold, Jasmin A..,Solan, Martin.,...&Foster, Gavin L..(2024).Geochemical proxies for deep-sea temperature and nutrient content in cold-water bamboo corals.CHEMICAL GEOLOGY,654.
MLA	Williams, Thomas J.,et al."Geochemical proxies for deep-sea temperature and nutrient content in cold-water bamboo corals".CHEMICAL GEOLOGY 654(2024).