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DOI	10.5194/cp-15-795-2019
	Sensitivity of a leaf gas-exchange model for estimating paleoatmospheric CO2 concentration
	Royer D.L.; Moynihan K.M.; McKee M.L.; Londoño L.; Franks P.J.
发表日期	2019
ISSN	18149324
起始页码	795
结束页码	809
卷号	15 期号:2
英文摘要	Leaf gas-exchange models show considerable promise as paleo-CO2 proxies. They are largely mechanistic in nature, provide well-constrained estimates even when CO2 is high, and can be applied to most subaerial, stomatabearing fossil leaves from C3 taxa, regardless of age or taxonomy. Here we place additional observational and theoretical constraints on one of these models, the "Franks" model. In order to gauge the model's general accuracy in a way that is appropriate for fossil studies, we estimated CO2 from 40 species of extant angiosperms, conifers, and ferns based only on measurements that can be made directly from fossils (leaf δ13C and stomatal density and size) and on a limited sample size (one to three leaves per species). The mean error rate is 28 %, which is similar to or better than the accuracy of other leading paleo-CO2 proxies. We find that leaf temperature and photorespiration do not strongly affect estimated CO2 , although more work is warranted on the possible influence of O2 concentration on photorespiration. Leaves from the lowermost 1-2m of closed-canopy forests should not be used because the local air δ13C value is lower than the global well-mixed value. Such leaves are not common in the fossil record but can be identified by morphological and isotopic means. © Author(s) 2019.
语种	英语
scopus关键词	angiosperm; carbon dioxide; concentration (composition); coniferous tree; estimation method; fern; fossil; fossil record; gas exchange; leaf; numerical model; paleoenvironment; proxy climate record; sensitivity analysis; Coniferophyta; Filicophyta; Magnoliophyta
来源期刊	Climate of the Past
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/146824
作者单位	Department of Earth and Environmental Sciences, Wesleyan University, Middletown, CT, United States; Smithsonian Tropical Research Institute, Balboa, Ancón, Panama; Faculty of Agriculture and Environment, University of Sydney, Sydney, NSW, Australia
推荐引用方式 GB/T 7714	Royer D.L.,Moynihan K.M.,McKee M.L.,et al. Sensitivity of a leaf gas-exchange model for estimating paleoatmospheric CO2 concentration[J],2019,15(2).
APA	Royer D.L.,Moynihan K.M.,McKee M.L.,Londoño L.,&Franks P.J..(2019).Sensitivity of a leaf gas-exchange model for estimating paleoatmospheric CO2 concentration.Climate of the Past,15(2).
MLA	Royer D.L.,et al."Sensitivity of a leaf gas-exchange model for estimating paleoatmospheric CO2 concentration".Climate of the Past 15.2(2019).