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. https://resolver.caltech.edu/CaltechAUTHORS:20140611-135219621
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Abstract
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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Additional Information: | © 2007 American Chemical Society. | ||||||
Record Number: | CaltechAUTHORS:20140611-135219621 | ||||||
Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20140611-135219621 | ||||||
Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||
ID Code: | 46215 | ||||||
Collection: | CaltechAUTHORS | ||||||
Deposited By: | Tony Diaz | ||||||
Deposited On: | 11 Jun 2014 21:00 | ||||||
Last Modified: | 03 Oct 2019 06:42 |
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