Please use this identifier to cite or link to this item:
Title: Comparison of in-situ water vapour isotope analysers
Authors: Element, A
Parkes, SD
Griffith, DWT
Wang, L
McCabe, MF
Keywords: Water vapor
Isotope ratio
Fourier transformation
Issue Date: 5-Dec-2011
Publisher: American Geophysical Union
Citation: Element, A., Parkes, S. D., Griffith, D. W., Wang. L., McCabe, M. F. (2011). Comparison of in-situ water vapour isotope analysers. Paper present at the AGU Fall Meeting, December 5-9, 2011, San Francisco.
Series/Report no.: B31E-0363
Abstract: Recently there have been a number of spectroscopic based in-situ water vapour isotope analysers developed. These analysers are capable of providing datasets that are useful for a range studies including interpreting rapid fluctuations associated with land atmosphere exchange processes, and validation of process based models that work on different spatial and temporal scales. Here we present a comparison of three spectroscopic analysers that provide in-situ analysis of water vapour isotopes. These include a Fourier Transform InfraRed (FTIR) spectroscopy based system (broad band technique), a system based on Off-Axis Integrated Cavity Output Spectroscopy (OA-ICOS), and a Wavelength-Scanned Cavity Ring-Down Spectroscopy (WS-CRDS) system. Using a continuous flow calibration system, liquid isotopic standards were vaporised and used to determine the response of the three analysers to changes isotopic composition and the water vapour mixing ratio. Based on these experiments it was shown that all three analysers required significant corrections to move the raw data onto the Standard Mean Ocean Water (SMOW) scale. We then deployed the three analysers at a coastal location near Sydney, Australia where diurnal temperature variations are relatively small and high mixing ratios are generally observed. The WS-CRDS and OA-ICOS were then deployed in central NSW, Australia where large diurnal temperature variations and relatively low mixing ratios were observed. The in-situ isotope data collected from the three analysers is then compared between these two locations.
Gov't Doc #: 9495
Appears in Collections:Conference Publications

Files in This Item:
There are no files associated with this item.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.