气候变化领域集成服务门户(CCPortal): Calibration of modern sedimentary δ2H plant wax-water relationships in Greenland lakes

CCPortal

DOI	10.1016/j.quascirev.2019.105978
	Calibration of modern sedimentary δ2H plant wax-water relationships in Greenland lakes
	McFarlin J.M.; Axford Y.; Masterson A.L.; Osburn M.R.
发表日期	2019
ISSN	0277-3791
卷号	225
英文摘要	Sedimentary plant wax distributions and isotopic compositions are powerful, widely applied paleoenvironmental proxies. However, there is conflicting evidence on the behavior of these proxies at high-latitude sites, where extreme climate and light conditions may uniquely influence plant physiology and growth. Here, we present modern sedimentary n-alkane and n-alkanoic acid abundances and compound-specific (δ2H and δ13C) isotope values from a 22-lake transect extending from northwest to southernmost Greenland, covering a large latitudinal and climatic gradient. Sedimentary plant waxes are similar in abundance and carbon isotopic composition across the transect, suggesting no major differences in biologic sources. There are strong correlations (r = 0.8–0.9) between δ2H values of many long-chain sedimentary waxes and those of modelled precipitation, with n-alkanes more tightly correlated to precipitation than n-alkanoic acids. Data presented here also demonstrate that δ2H values of mid-chain sedimentary waxes do not strongly correlate to the δ2H values of lake water when it decouples isotopically from precipitation (i.e. in glacier-fed and evaporatively-enriched lakes). This calls into question the common interpretation that mid-chain sedimentary waxes can be ascribed to aquatic plants. We contextualize our Greenland data with an updated global dataset of δ2H values of modern sedimentary waxes and precipitation. This update adds 100 + lakes from recently published literature to the seminal review presented by Sachse et al. (2012). This large new compilation suggests a global average apparent fractionation including Arctic data between n-C28 alkanoic acids and annual precipitation (εC28/ANN) of −99‰, and between n-C29 alkanes and annual precipitation (εC29/ANN) of −121‰. The latter value is remarkably consistent with the value first reported by Sachse et al. (2012). © 2019 Elsevier Ltd
英文关键词	Continental biomarkers; Greenland; Paleolimnology; Present; Stable isotopes
语种	英语
scopus关键词	Carboxylic acids; Isotopes; Lakes; Paleolimnology; Paraffins; Annual precipitation; Carbon isotopic composition; Conflicting evidence; Greenland; Isotopic composition; Present; Stable isotopes; Strong correlation; Sedimentology; biomarker; calibration; fractionation; isotopic composition; lake water; paleolimnology; precipitation (climatology); stable isotope; wax; Arctic; Greenland
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151704
作者单位	Department of Earth and Planetary Sciences, Northwestern University, Evanston, IL 60208, United States
推荐引用方式 GB/T 7714	McFarlin J.M.,Axford Y.,Masterson A.L.,et al. Calibration of modern sedimentary δ2H plant wax-water relationships in Greenland lakes[J],2019,225.
APA	McFarlin J.M.,Axford Y.,Masterson A.L.,&Osburn M.R..(2019).Calibration of modern sedimentary δ2H plant wax-water relationships in Greenland lakes.Quaternary Science Reviews,225.
MLA	McFarlin J.M.,et al."Calibration of modern sedimentary δ2H plant wax-water relationships in Greenland lakes".Quaternary Science Reviews 225(2019).