High-resolution continuous-flow analysis setup for water iso
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TitleHigh-resolution continuous-flow analysis setup for water isotopic measurement from ice cores using laser spectroscopyAbstractHere we present an experimental setup for water stable isotope (δ18O and δD) continuous-flow measurements and provide metrics defining the performance of the setup during a major ice core measurement campaign (Roosevelt Island Climate Evolution; RICE). We also use the metrics to compare alternate systems. Our setup is the first continuous-flow laser spectroscopy system that is using off-axis integrated cavity output spectroscopy (OA-ICOS; analyzer manufactured by Los Gatos Research, LGR) in combination with an evaporation unit to continuously analyze water samples from an ice core. A Water Vapor Isotope Standard Source (WVISS) calibration unit, manufactured by LGR, was modified to (1) enable measurements on several water standards, (2) increase the temporal resolution by reducing the response time and (3) reduce the influence from memory effects. While this setup was designed for the continuous-flow analysis (CFA) of ice cores, it can also continuously analyze other liquid or vapor sources. The custom setups provide a shorter response time (∼54 and 18 s for 2013 and 2014 setup, respectively) compared to the original WVISS unit (∼62 s), which is an improvement in measurement resolution. Another improvement compared to the original WVISS is that the custom setups have a reduced memory effect. Stability tests comparing the custom and WVISS setups were performed and Allan deviations (σ<inf>Allan</inf>) were calculated to determine precision at different averaging times. For the custom 2013 setup the precision after integration times of 103 s is 0.060 and 0.070 †Degrees for δ18O and δD, respectively. The corresponding σ<inf>Allan</inf> values for the custom 2014 setup are 0.030, 0.060 and 0.043 †Degrees for δ18O, δD and δ17O, respectively. For the WVISS setup the precision is 0.035, 0.070 and 0.042 †Degrees after 103 s for δ18O, δD and δ17O, respectively. Both the custom setups and WVISS setup are influenced by instrumental drift with δ18O being more drift sensitive than δD. The σ<inf>Allan</inf> values for δ18O are 0.30 and 0.18 †Degrees for the custom 2013 and WVISS setup, respectively, after averaging times of 104 s (2.78 h). Using response time tests and stability tests, we show that the custom setups are more responsive (shorter response time), whereas the University of Copenhagen (UC) setup is more stable. More broadly, comparisons of different setups address the challenge of integrating vaporizer/spectrometer isotope measurement systems into a CFA campaign with many other analytical instruments. Copyright 2015 Author(s).AcknowledgementsThe authors would like to thank two anonymous reviewers for their comments that helped to improve the final version of the paper. We thank Cedric Douence and Andy Phillips for analyzing discrete samples on the DLT-100 LGR analyzer and Valerie Claymore, Bruce Crothers, Ed Hutchinson, Rebecca Pyne and Steve Mawdesley for help with modification of the WVISS. Doug Baer and Manish Gupta (LGR) assisted with optimization discussions and provision of additional equipment. We thank Stefanie Semper for LabVIEW programming. The funding for the project was provided by the New Zealand Government through GNS Science (Global Change through Time Programme, GNS-540GCT12 and GNS-540GCT32) and Victoria University of Wellington (RDF-VUW-1103). This work is a contribution to the Roosevelt Island Climate Evolution (RICE) Program, funded by national contributions from New Zealand, Australia, Denmark, Germany, Italy, Peopleś Republic of China, Sweden, United Kingdom and the United States of America. The main logistic support was provided by Antarctica New Zealand (K049) and the US Polar Program (I-209M).Funding DetailsK049, Antarctica New Zealand; RDF-VUW-1103, Antarctica New Zealand
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1st AuthorEmanuelsson, B.AuthorEmanuelsson, B.Baisden, W.Bertler, N.Keller, E.Gkinis, V.Year2015JournalAtmospheric Measurement TechniquesVolume8Number7Pages2869-2883DOI10.5194/amt-8-2869-2015URLhttps://www.scopus.com/inward/recor.....5781f02e5eb3c588a81ba0ba5Keywordsrank5ProgrammeK049 - NZ ITASE: Roosevelt Island Climate Evolution (RICE)
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TypeArticleCitationEmanuelsson, B., Baisden, W., Bertler, N., Keller, E. and Gkinis, V. (2015). High-resolution continuous-flow analysis setup for water isotopic measurement from ice cores using laser spectroscopy. Atmospheric Measurement Techniques, 8(7): 2869-2883 IdentifierEmanuelsson2015Relevancerank5
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Gkinis, V., High-resolution continuous-flow analysis setup for water iso , [Emanuelsson2015]. Antarctica NZ, accessed 11/02/2025, https://adam.antarcticanz.govt.nz/nodes/view/63482, 10.5194/amt-8-2869-2015