Effects of leaf length and development stage on the triple oxygen isotope signature of grass leaf water and phytoliths: insights for a proxy of continental atmospheric humidity

Alexandre, Anne; Webb, Elizabeth; Landais, Amaelle; Piel, Clément; Devidal, Sébastien; Sonzogni, Corinne; Couapel, Martine; Mazur, Jean-Charles; Pierre, Monique; Prié, Frédéric; Vallet-Coulomb, Christine; Outrequin, Clément; Roy, Jacques

doi:https://doi.org/10.5194/bg-16-4613-2019

Articles | Volume 16, issue 23

https://doi.org/10.5194/bg-16-4613-2019

© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/bg-16-4613-2019

© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 16, issue 23

Research article

|

05 Dec 2019

Research article |

| 05 Dec 2019

Effects of leaf length and development stage on the triple oxygen isotope signature of grass leaf water and phytoliths: insights for a proxy of continental atmospheric humidity

Anne Alexandre, Elizabeth Webb, Amaelle Landais, Clément Piel, Sébastien Devidal, Corinne Sonzogni, Martine Couapel, Jean-Charles Mazur, Monique Pierre, Frédéric Prié, Christine Vallet-Coulomb, Clément Outrequin, and Jacques Roy

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Aug 2025	28	14	5	47
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Month	HTML	PDF	XML	Total
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Apr 2019	42	11	0	53
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Jul 2019	23	9	0	32
Aug 2019	7	3	0	10
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Nov 2019	6	6	0	12
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Jan 2020	29	25	1	55
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Mar 2022	10	6	0	16
Apr 2022	13	7	0	20
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Aug 2025	28	14	5	47
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Short summary

This calibration study shows that despite isotope heterogeneity along grass leaves, the triple oxygen isotope composition of bulk leaf phytoliths can be estimated from the Craig and Gordon model, a mixing equation and a mean leaf water–phytolith fractionation exponent (lambda) of 0.521. The results strengthen the reliability of the ¹⁷O–excess of phytoliths to be used as a proxy of atmospheric relative humidity and open tracks for its use as an imprint of leaf water ¹⁷O–excess.


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