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	Continuous measurement of water vapor D/H and (18)O/(16)O isotope ratios in the atmosphere
	Wen X. F. ; Sun X. M. ; Zhang S. C. ; Yu G. R. ; Sargent S. D. ; Lee X.
	2008
关键词	stable isotopes atmospheric water vapor hydrogen isotope oxygen isotope TDLAS laser absorption-spectroscopy stable-isotope deuterium excess micrometeorological techniques antarctic precipitation hydrogen isotopes gas-exchange oxygen cycle fractionation
英文摘要	The D/H and (18)O/(16)O ratios in atmospheric water vapor provide rich information on the hydrological cycle and gaseous exchange processes between the terrestrial vegetation and the atmosphere. In this paper, we have demonstrated the feasibility to simultaneously measure both D/H and (18)O/(16)O in atmospheric water vapor using a tunable diode laser absorption spectrometer. Our laboratory tests showed that the 1-h precision (one standard deviation) was 1.1 parts per thousand for D/H and 0.07 parts per thousand for (18)O/(16)O at the dewpoint temperature of 15 degrees C. The difference between the laser measurement and cold trap/mass spectrometer analysis was 1.2 +/- 6.0 parts per thousand (hourly mean +/- one standard deviation) for D/H and 1.1 +/- 1.3 parts per thousand for (18)O/(16)O. Our atmospheric measurement captured the rapidly changing isotopic signals in both D/H and (18)O/(16)O. The measured isotope ratios were highly correlated with the water vapor mixing ratio as expected and followed very closely the Global Meteoric Water Line except during two transitional periods when the deuterium excess of atmospheric vapor deviated from the standard value. In addition, we have refined a method to provide independent, timely performance test of the in situ system. (C) 2007 Elsevier B.V. All rights reserved.
出处	Journal of Hydrology
卷	349
期	3-4
页	489-500
收录类别	SCI
语种	英语
ISSN号	0022-1694
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/22808]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Wen X. F.,Sun X. M.,Zhang S. C.,et al. Continuous measurement of water vapor D/H and (18)O/(16)O isotope ratios in the atmosphere. 2008.

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