气候变化领域集成服务门户(CCPortal): Advances in global bioavailable strontium isoscapes

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DOI	10.1016/j.palaeo.2020.109849
	Advances in global bioavailable strontium isoscapes
	Bataille C.P.; Crowley B.E.; Wooller M.J.; Bowen G.J.
发表日期	2020
ISSN	0031-0182
卷号	555
英文摘要	Strontium isotope ratios (87Sr/86Sr) are a popular tool in provenance applications in archeology, forensics, paleoecology, and environmental sciences. Using bioavailable 87Sr/86Sr in provenance studies requires comparing the 87Sr/86Sr of a sample of interest to that of 87Sr/86Sr baselines. Historically, these baselines required building empirical datasets from plants or local animals to characterize the 87Sr/86Sr available to local ecosystems (bioavailable 87Sr/86Sr). However, researchers are increasingly relying on modeled bioavailable 87Sr/86Sr maps (called isoscapes). We review the advantages and limitations of existing approaches to mapping bioavailable 87Sr/86Sr for provenance studies and propose a globally applicable, scalable, and editable framework for creating bioavailable 87Sr/86Sr isoscapes. This framework relies on: 1) Compiling global bioavailable 87Sr/86Sr data; 2) Mapping 87Sr/86Sr variability in rocks; 3) Leveraging global environmental covariates; and 4) Applying a random forest regression method that integrates these data to predict bioavailable 87Sr/86Sr. When the random-forest model is applied at the global scale it performs well (explaining 60% of the variance of the global bioavailable 87Sr/86Sr dataset), and accounts for geological, geomorphological and atmospheric controls. In data-rich regions (e.g., Europe), the global bioavailable 87Sr/86Sr isoscape can be successfully extrapolated to broad regions without bioavailable 87Sr/86Sr data. However, we also show that this extrapolation may not be valid in exceptionally geologically complex and data-poor regions (e.g., Madagascar). We suggest research directions to improve the accuracy of global bioavailable 87Sr/86Sr isoscapes, which include: 1) Increasing the collection of bioavailable datasets in data-poor regions; 2) Harmonizing data management practices and metadata collection for bioavailable 87Sr/86Sr data; and 3) Relying on advances in remote sensing and geological mapping techniques to improve geological covariates. While significant potential to refine 87Sr/86Sr isoscapes remains, the data products provided in this review form a basis for using 87Sr/86Sr data in large-scale provenance studies, opening new research avenues in a range of fields. © 2020 Elsevier B.V.
英文关键词	Isotopes; Madagascar; Migration; Provenance; Random forest; Regression
语种	英语
scopus关键词	bioavailability; data management; data set; geological mapping; global change; isotopic ratio; metadata; remote sensing; strontium isotope; Europe; Madagascar; Animalia
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150415
作者单位	Department of Earth and Environmental Sciences, University of Ottawa, 120 University, Ottawa, ON K1N 6N5, Canada; Department of Geology, University of Cincinnati, 500 Geology Physics Building, 345 Clifton Court, Cincinnati, OH 45221-0013, United States; Department of Anthropology, University of Cincinnati, 481 Braunstein Hall, Cincinnati, OH 45221-0380, United States; Alaska Stable Isotope Facility, Water and Environmental Research Center, Institute of Northern Engineering, University of Alaska Fairbanks, Fairbanks, AK 99775, United States; Marine Biology Department, College of Fisheries and Ocean Sciences, University of Alaska Fairbanks, Fairbanks, AK 99775, United States; Department of Geology & Geophysics and Global Change & Sustainability Center, University of Utah, 115 S 1460 E, Salt Lake City, UT 84112, United States
推荐引用方式 GB/T 7714	Bataille C.P.,Crowley B.E.,Wooller M.J.,et al. Advances in global bioavailable strontium isoscapes[J],2020,555.
APA	Bataille C.P.,Crowley B.E.,Wooller M.J.,&Bowen G.J..(2020).Advances in global bioavailable strontium isoscapes.Palaeogeography, Palaeoclimatology, Palaeoecology,555.
MLA	Bataille C.P.,et al."Advances in global bioavailable strontium isoscapes".Palaeogeography, Palaeoclimatology, Palaeoecology 555(2020).