A comparison between direct and pan-derived measurements of the isotopic composition of atmospheric waters

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dc.contributor.authorAzcurra, CSen_AU
dc.contributor.authorHughes, CEen_AU
dc.contributor.authorParkes, SDen_AU
dc.contributor.authorHollins, SEen_AU
dc.contributor.authorGibson, JJen_AU
dc.contributor.authorMcCabe, MFen_AU
dc.contributor.authorEvans, JPen_AU
dc.date.accessioned2020-05-19T07:37:35Zen_AU
dc.date.available2020-05-19T07:37:35Zen_AU
dc.date.issued2011-12-12en_AU
dc.date.statistics2020-05-19en_AU
dc.description.abstractThe stable isotopes of water can be used to examine and quantify the contribution to atmospheric moisture from evaporation, transpiration and surface-waters. However, obtaining extensive and ongoing time series data of the isotopic composition of atmospheric moisture has been difficult. Presented here is an alternate method using an isotope mass balance approach to estimate the isotopic composition of atmospheric moisture using water samples collected from class A evaporation pans. While this evaporation pan method does not provide the high-resolution time series data that can be obtained from an isotope analyser taking in-situ measurements of atmospheric moisture, the method is relatively simple and inexpensive to set-up and maintain. In this preliminary investigation, a comparison between the isotopic composition of atmospheric moisture estimated from the evaporation pan method and in-situ measurements of the isotopic composition of water vapour using a Fourier Transform Infrared (FTIR) spectrometer deployed at the Lucas Heights weather station in New South Wales is undertaken. Through comparison of the two series of hydrogen isotope data, an assessment of the evaporation pan method can be made. Although there was some agreement between the isotopic composition of vapour measured by the FTIR spectrometer and the estimation for the atmospheric moisture (R2 = 0.49), the comparison is sensitive to climatic parameters that vary significantly within a 24-hour period such as the relative humidity of air and the air and pan temperatures. Inverting the model to use the FTIR spectrometer measurements at an hourly resolution improved the performance of the model (R2 =0.57). However, this also revealed that the model produced more depleted values of the evaporation pan water isotopes than those observed. In contrast, there was a variable relationship between the modelled and observed isotope values of atmospheric moisture. These conflicting results will need to be resolved before the evaporation pan method is broadly applied in isotope hydrology. © 2011 The Modelling and Simulation Society of Australia and New Zealand Inc.en_AU
dc.identifier.citationAzcurra, C. S., Hughes, C. E., Parkes, S., Hollins, S. E., Gibson, J. J., McCabe, M. F., & Evans, J. P. (2011). A comparison between direct and pan-derived measurements of the isotopic composition of atmospheric waters. Papers presented at MODSIM2011, 19th International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, 12-16 December 2011, Perth, Australia. (pp. 3279-3285).en_AU
dc.identifier.conferenceenddate16 December 2011en_AU
dc.identifier.conferencenameMODSIM2011, 19th International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealanden_AU
dc.identifier.conferenceplacePerth, Australiaen_AU
dc.identifier.conferencestartdate12 December 2011en_AU
dc.identifier.govdoc9511en_AU
dc.identifier.isbn978-0-9872143-1-7en_AU
dc.identifier.isbn9780987214317en_AU
dc.identifier.pagination3279-3285en_AU
dc.identifier.urihttps://doi.org//10.36334/modsim.2011.l1.elmahdien_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/9464en_AU
dc.identifier.urihttps://www.mssanz.org.au/modsim2011/I1/azcurra.pdfen_AU
dc.language.isoenen_AU
dc.publisherThe Modelling and Simulation Society of Australia and New Zealand Inc.en_AU
dc.subjectStable isotopesen_AU
dc.subjectHydrologyen_AU
dc.subjectAtmospheric precipitationsen_AU
dc.subjectEvaporationen_AU
dc.subjectDeuteriumen_AU
dc.subjectMoistureen_AU
dc.titleA comparison between direct and pan-derived measurements of the isotopic composition of atmospheric watersen_AU
dc.typeConference Paperen_AU
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