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Can hydrogen isotopic ratios in plant lipids provide a quantitative proxy for aridity?

Feakins, Sarah J. and Sessions, Alex L. (2007) Can hydrogen isotopic ratios in plant lipids provide a quantitative proxy for aridity? In: 234th ACS National Meeting & Exposition, August 19-23, 2007, Boston, MA.

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Hydrogen-isotopic fractionations within the hydrol. cycle respond strongly to climatic variables, including evapn. We are investigating whether the D/H ratios of leaf-wax lipids can provide a quant. proxy for aridity, by sampling multiple plant species along a gradient of declining pptn. totals across southern California (from 1000 to 200 mm/yr pptn.). We observe a strongly aridity-dependent D/H enrichment of plant waters which reduces the apparent fractionation of leaf-wax lipids relative to source water (ranging from -120 to -60 per mil). However, the aridity signal is suppressed in leaf-wax lipids by an opposing 40 per mil decrease in the delta-D of pptn. along the storm track. Paleoaridity reconstructions from leaf-wax delta-D values will be most robust where the isotopic compn. of environmental waters is const. or independently constrained. Our multi-species and catchment scale approach also quantifies the potential influence of changing plant community assemblage on the sedimentary leaf-wax lipid isotopic signal.

Item Type:Conference or Workshop Item (Paper)
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URLURL TypeDescription Website
Feakins, Sarah J.0000-0003-3434-2423
Sessions, Alex L.0000-0001-6120-2763
Additional Information:© 2007 American Chemical Society.
Record Number:CaltechAUTHORS:20140611-135219621
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:46215
Deposited By: Tony Diaz
Deposited On:11 Jun 2014 21:00
Last Modified:03 Oct 2019 06:42

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