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A Direct Method to Measure 14CO2 Lost by Evasion from Surface Waters

Published online by Cambridge University Press:  18 July 2016

M F Billett ,
M H Garnett  and
S M L Hardie
M F Billett
Affiliation:
Centre for Ecology and Hydrology, Bush Estate, Penicuik, Midlothian, EH26 OQB, United Kingdom
M H Garnett
Affiliation:
Natural Environment Research Council (NERC) Radiocarbon Laboratory, Rankine Avenue, Scottish Enterprise Technology Park, East Kilbride, G75 OQF, United Kingdom
S M L Hardie
Affiliation:
Natural Environment Research Council (NERC) Radiocarbon Laboratory, Rankine Avenue, Scottish Enterprise Technology Park, East Kilbride, G75 OQF, United Kingdom Centre for Ecology and Hydrology, Library Avenue, Bailrigg, Lancaster, LA1 4AP, United Kingdom
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Abstract

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Recent methodological advances in the use of zeolite molecular sieves for measuring the isotopic signature of CO2 have provided the opportunity to make direct measurements of 14CO2 in various field situations. We linked a portable molecular sieve/pump/IRGA system to a floating chamber to demonstrate the potential of the method to quantify the isotopic signature (δ13C and 14C) of CO2 lost by evasion (outgassing) from surface waters. The system, which was tested on a peatland stream in Scotland, involved 1) an initial period of scrubbing ambient CO2 from the chamber, 2) a period of CO2 build-up caused by surface water evasion, and 3) a final period of CO2 collection by the molecular sieve cartridge. The field test at 2 different sites on the same drainage system suggested that the results were reproducible in terms of δ13C and 14C values. These represent the first direct measurements of the isotopic signature of CO2 lost by evasion from water surfaces.

Type
Articles
Information
Radiocarbon , Volume 48 , Issue 1 , 2006 , pp. 61 - 68
Copyright
Copyright © 2006 by the Arizona Board of Regents on behalf of the University of Arizona 

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