globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2017.01.015
论文题名:
Comment on “Was atmospheric CO2 capped at 1000 ppm over the past 300 million years?” by McElwain J. C. et al. [Palaeogeogr. Palaeoclimatol. Palaeoecol. 441 (2016) 653–658]
作者: Franks P.J.; Royer D.L.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2017
卷: 472
起始页码: 256
结束页码: 259
语种: 英语
英文关键词: Atmospheric CO2 ; CO2 model ; Fossils ; Palaeoatmosphere ; Phanerozoic
英文摘要: Franks et al. (2014) developed a model for estimating the concentration of atmospheric CO2 (ca) that can be applied to most stomata-bearing plant fossils. In a recent paper, McElwain et al. (2016a) proposed changes to two of the key inputs: mesophyll conductance to CO2 (gm) and CO2 assimilation rate at a known ca (A0). These proposed changes lead to increases in the model-estimates of ca. Here we show a lack of support for these proposed changes. First, the downward revision of gm is the result of a mathematical error by McElwain et al. (2016a) when describing the relationship between CO2 assimilation rate (An) and gm. Once corrected, values for gm are very similar to the values recommended by Franks et al. (2014). Second, the proposed ~ 2-fold upward revision of A0 is not supported by data from extant analogs or by hydraulic constraints from fossils. Moreover, the modelled estimates of An from Franks and Beerling (2009) are in fact most consistent with the modelled An in Franks et al. (2014) using their recommended A0 values, not those proposed by McElwain et al. (2016a). These results provide further support for the strategy of model implementation outlined in Franks et al. (2014). © 2017 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/67890
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作者单位: Faculty of Agriculture and Environment, The University of SydneyNSW, Australia; Department of Earth and Environmental Sciences, Wesleyan University, Middletown, CT, United States

Recommended Citation:
Franks P.J.,Royer D.L.. Comment on “Was atmospheric CO2 capped at 1000 ppm over the past 300 million years?” by McElwain J. C. et al. [Palaeogeogr. Palaeoclimatol. Palaeoecol. 441 (2016) 653–658][J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2017-01-01,472
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