A record of vapour pressure deficit preserved in wood and soil across biomes

Abstract The drying power of air, or vapour pressure deficit (VPD), is an important measurement of potential plant stress and productivity. Estimates of VPD values of the past are integral for understanding the link between rising modern atmospheric carbon dioxide (pCO2) and global water balance. A...

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Autores principales:	Adrian Broz, Gregory J. Retallack, Toby M. Maxwell, Lucas C. R. Silva
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/39998cfd72de4d07b796ca5bf49b3511
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spelling	oai:doaj.org-article:39998cfd72de4d07b796ca5bf49b35112021-12-02T14:01:33ZA record of vapour pressure deficit preserved in wood and soil across biomes10.1038/s41598-020-80006-92045-2322https://doaj.org/article/39998cfd72de4d07b796ca5bf49b35112021-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-80006-9https://doaj.org/toc/2045-2322Abstract The drying power of air, or vapour pressure deficit (VPD), is an important measurement of potential plant stress and productivity. Estimates of VPD values of the past are integral for understanding the link between rising modern atmospheric carbon dioxide (pCO2) and global water balance. A geological record of VPD is needed for paleoclimate studies of past greenhouse spikes which attempt to constrain future climate, but at present there are few quantitative atmospheric moisture proxies that can be applied to fossil material. Here we show that VPD leaves a permanent record in the slope (S) of least-squares regressions between stable isotope ratios of carbon and oxygen (13C and 18O) found in cellulose and pedogenic carbonate. Using previously published data collected across four continents we show that S can be used to reconstruct VPD within and across biomes. As one application, we used S to estimate VPD of 0.46 kPa ± 0.26 kPa for cellulose preserved tens of millions of years ago—in the Eocene (45 Ma) Metasequoia from Axel Heiberg Island, Canada—and 0.82 kPa ± 0.52 kPa—in the Oligocene (26 Ma) for pedogenic carbonate from Oregon, USA—both of which are consistent with existing records at those locations. Finally, we discuss mechanisms that contribute to the positive correlation observed between VPD and S, which could help reconstruct past climatic conditions and constrain future alterations of global carbon and water cycles resulting from modern climate change.Adrian BrozGregory J. RetallackToby M. MaxwellLucas C. R. SilvaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Adrian Broz Gregory J. Retallack Toby M. Maxwell Lucas C. R. Silva A record of vapour pressure deficit preserved in wood and soil across biomes
description	Abstract The drying power of air, or vapour pressure deficit (VPD), is an important measurement of potential plant stress and productivity. Estimates of VPD values of the past are integral for understanding the link between rising modern atmospheric carbon dioxide (pCO2) and global water balance. A geological record of VPD is needed for paleoclimate studies of past greenhouse spikes which attempt to constrain future climate, but at present there are few quantitative atmospheric moisture proxies that can be applied to fossil material. Here we show that VPD leaves a permanent record in the slope (S) of least-squares regressions between stable isotope ratios of carbon and oxygen (13C and 18O) found in cellulose and pedogenic carbonate. Using previously published data collected across four continents we show that S can be used to reconstruct VPD within and across biomes. As one application, we used S to estimate VPD of 0.46 kPa ± 0.26 kPa for cellulose preserved tens of millions of years ago—in the Eocene (45 Ma) Metasequoia from Axel Heiberg Island, Canada—and 0.82 kPa ± 0.52 kPa—in the Oligocene (26 Ma) for pedogenic carbonate from Oregon, USA—both of which are consistent with existing records at those locations. Finally, we discuss mechanisms that contribute to the positive correlation observed between VPD and S, which could help reconstruct past climatic conditions and constrain future alterations of global carbon and water cycles resulting from modern climate change.
format	article
author	Adrian Broz Gregory J. Retallack Toby M. Maxwell Lucas C. R. Silva
author_facet	Adrian Broz Gregory J. Retallack Toby M. Maxwell Lucas C. R. Silva
author_sort	Adrian Broz
title	A record of vapour pressure deficit preserved in wood and soil across biomes
title_short	A record of vapour pressure deficit preserved in wood and soil across biomes
title_full	A record of vapour pressure deficit preserved in wood and soil across biomes
title_fullStr	A record of vapour pressure deficit preserved in wood and soil across biomes
title_full_unstemmed	A record of vapour pressure deficit preserved in wood and soil across biomes
title_sort	record of vapour pressure deficit preserved in wood and soil across biomes
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/39998cfd72de4d07b796ca5bf49b3511
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A record of vapour pressure deficit preserved in wood and soil across biomes

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