{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,16]],"date-time":"2026-03-16T09:36:51Z","timestamp":1773653811647,"version":"3.50.1"},"reference-count":21,"publisher":"MDPI AG","issue":"4","license":[{"start":{"date-parts":[[2010,4,4]],"date-time":"2010-04-04T00:00:00Z","timestamp":1270339200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/3.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>A homemade CO2\u2013laser 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 (\u03b413C) 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.<\/jats:p>","DOI":"10.3390\/s100403305","type":"journal-article","created":{"date-parts":[[2010,4,5]],"date-time":"2010-04-05T10:36:39Z","timestamp":1270463799000},"page":"3305-3313","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Laser Photoacoustic Detection of CO2 in Old Disc Tree-Rings"],"prefix":"10.3390","volume":"10","author":[{"given":"Boris","family":"Ageev","sequence":"first","affiliation":[{"name":"Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Sciences, Academician Zuev Square, 1. Tomsk, 634055, Russia"}]},{"given":"Yurii","family":"Ponomarev","sequence":"additional","affiliation":[{"name":"Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Sciences, Academician Zuev Square, 1. Tomsk, 634055, Russia"}]},{"given":"Valeria","family":"Sapozhnikova","sequence":"additional","affiliation":[{"name":"Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Sciences, Academician Zuev Square, 1. 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