Sensors 2010, 10(4), 3305-3313; doi:10.3390/s100403305
Communication

Laser Photoacoustic Detection of CO2 in Old Disc Tree-Rings

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Received: 29 December 2009; in revised form: 16 February 2010 / Accepted: 6 March 2010 / Published: 4 April 2010
(This article belongs to the Special Issue Laser Spectroscopy and Sensing)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: 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.
Keywords: laser photoacoustic gas analysis; carbon dioxide; tree-rings; H2O
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MDPI and ACS Style

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

AMA Style

Ageev B, Ponomarev Y, Sapozhnikova V. Laser Photoacoustic Detection of CO2 in Old Disc Tree-Rings. Sensors. 2010; 10(4):3305-3313.

Chicago/Turabian Style

Ageev, Boris; Ponomarev, Yurii; Sapozhnikova, Valeria. 2010. "Laser Photoacoustic Detection of CO2 in Old Disc Tree-Rings." Sensors 10, no. 4: 3305-3313.

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