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dc.contributor.author
Sturm, Patrick
dc.contributor.author
Knohl, Alexander
dc.date.accessioned
2022-06-23T05:48:28Z
dc.date.available
2017-06-08T23:39:00Z
dc.date.available
2019-09-06T15:44:30Z
dc.date.available
2022-06-23T05:48:28Z
dc.date.issued
2009-08-28
dc.identifier.issn
1867-8610
dc.identifier.other
10.5194/amtd-2-2055-2009
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/19639
dc.identifier.doi
10.3929/ethz-b-000019639
dc.description.abstract
We present a detailed assessment of a commercially available water vapor isotopeanalyzer (WVIA, Los Gatos Research, Inc.) for simultaneous in-situ measurements ofδ2H andδ18O in water vapor. This method, based on off-axis integrated cavity outputspectroscopy, is an alternative to the conventional water trap/isotope ratio mass spectrometry (IRMS) techniques. We evaluate the analyzer in terms of precision, memoryeffects, concentration dependence, temperature sensitivity and long-term stability. Acalibration system based on ink jet technology is used to characterize the performanceand to calibrate the analyzer. Our results show that the precision at an averagingtime of 15 s is 0.16‰ forδ2H and 0.08‰ forδ18O. The isotope ratios are strongly dependent on the water mixing ratio of the air. Taking into account this concentrationdependence as well as the temperature sensitivity of the instrument we obtained along-term stability of the water isotope measurements of 0.38‰ forδ2H and 0.25‰forδ18O. The accuracy of the WVIA was further assessed by comparative measure-ments using IRMS and a dew point generator indicating a linear response in isotopic composition and H2O concentrations. The WVIA combined with a calibration systemprovides accurate high resolution water vapor isotope measurements and opens newpossibilities for hydrological and ecological applications
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Copernicus
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/3.0/
dc.title
Water vapor δ2H and δ18O measurements using off-axis integrated cavity output spectroscopy
en_US
dc.type
Working Paper
dc.rights.license
Creative Commons Attribution 3.0 Unported
ethz.journal.title
Atmospheric Measurement Techniques Discussions
ethz.journal.volume
2
en_US
ethz.journal.issue
4
en_US
ethz.journal.abbreviated
Atmos. meas. tech., Pap. open discuss.
ethz.pages.start
2055
en_US
ethz.pages.end
2085
en_US
ethz.publication.place
Göttingen
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
03828 - Knohl, Alexander
en_US
ethz.leitzahl.certified
03828 - Knohl, Alexander
ethz.relation.isPreviousVersionOf
10.3929/ethz-b-000018531
ethz.date.deposited
2017-06-08T23:39:16Z
ethz.source
ECIT
ethz.identifier.importid
imp59364ca9649ae61904
ethz.ecitpid
pub:32035
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2017-07-14T22:02:31Z
ethz.rosetta.lastUpdated
2019-09-06T15:44:48Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
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