Loading...
Please wait, while we are loading the content...
Similar Documents
In Situ Measurement of the Water Vapor 18O/16O Isotope Ratio for Atmospheric and Ecological Applications
| Content Provider | Semantic Scholar |
|---|---|
| Author | Lee, Xuhui Sargent, Steve L. Smith, Ronald Bruce Tanner, Bert |
| Copyright Year | 2005 |
| Abstract | Abstract In this paper a system for in situ measurement of H216O/H218O in air based on tunable diode laser (TDL) absorption spectroscopy is described. Laboratory tests showed that its 60-min precision (one standard deviation) was 0.21‰ at a water vapor volume mixing ratio of 2.67 mmol mol−1 (dewpoint temperature −10.8°C at sea level) and improved to 0.09 at 15.3 mmol mol−1 (dewpoint temperature 13.4°C). The TDL measurement of the vapor generated by a dewpoint generator differed from the equilibrium prediction by −0.11 ± 0.43‰ (mean ± one standard deviation). Its measurement of the ambient water vapor differed from the cold-trap/mass spectrometer method by −0.36 ± 1.43‰. The larger noise of the latter comparison was caused primarily by the difficulty in extracting vapor from air without altering its isotope content. In a 1-week test in Logan, Utah, in August 2003, the isotope ratio of water vapor in ambient air was positively correlated with the water vapor mixing ratio and also responded to wetting events... |
| Starting Page | 555 |
| Ending Page | 565 |
| Page Count | 11 |
| File Format | PDF HTM / HTML |
| DOI | 10.1175/JTECH1719.1 |
| Volume Number | 22 |
| Alternate Webpage(s) | https://xleelab.sites.yale.edu/sites/default/files/files/tga.pdf |
| Alternate Webpage(s) | https://doi.org/10.1175/JTECH1719.1 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
