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Sensors 2010, 10(4), 3305-3313;

Laser Photoacoustic Detection of CO2 in Old Disc Tree-Rings

Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Sciences, Academician Zuev Square, 1. Tomsk, 634055, Russia
Author to whom correspondence should be addressed.
Received: 29 December 2009 / Revised: 16 February 2010 / Accepted: 6 March 2010 / Published: 4 April 2010
(This article belongs to the Special Issue Laser Spectroscopy and Sensing)
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A homemade CO2–laser photoacoustic spectrometer has been used for monitoring CO2 in gas samples extracted under vacuum from the wood of old spruce disc tree-rings for a ~60 year series. The experimental results show that (1) the CO2 concentration exhibits annual trends correlated with an increase in atmospheric CO2 in a number of cases; (2) at the time when the annual CO2 trend changes from positive to negative, the annual tree-ring stable carbon isotope ratios (δ13C) of CO2 change as well; (3) the disc tree-ring widths are observed to decrease in most cases where the annual CO2 increased; (4) simultaneously with the annual CO2 variation, annual H2O distribution was detected in gas samples of the wood tree-rings of one spruce disc. The observed patterns of the annual CO2 distribution in the disc tree-rings are assumed to be the evidence of the impact of the atmospheric CO2 increase. In other words, a change in the concentration gradient between the stem and the atmospheric CO2 may lead to a gradual CO2 accumulation in the stem because of a decrease in the diffusion rate and to a change in the tree parameters. View Full-Text
Keywords: laser photoacoustic gas analysis; carbon dioxide; tree-rings; H2O laser photoacoustic gas analysis; carbon dioxide; tree-rings; H2O
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Ageev, B.; Ponomarev, Y.; Sapozhnikova, V. Laser Photoacoustic Detection of CO2 in Old Disc Tree-Rings. Sensors 2010, 10, 3305-3313.

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