Affordable Access

Publisher Website

Laser Photoacoustic Detection of CO2 in Old Disc Tree-Rings

Authors
Journal
Sensors
1424-8220
Publisher
MDPI AG
Publication Date
Volume
10
Issue
4
Identifiers
DOI: 10.3390/s100403305
Keywords
  • Communication
Disciplines
  • Musicology
  • Physics

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.

There are no comments yet on this publication. Be the first to share your thoughts.

Statistics

Seen <100 times
0 Comments

More articles like this

CO2laser photoacoustic detection of ammonia emitte...

on Spectrochimica Acta Part A Mol... Jan 01, 2011

CO2-laser photoacoustic detection of gaseousn-pent...

on Journal of Molecular Spectrosc... Jan 01, 2009

CO2laser photoacoustic detection of ethylene emitt...

on Infrared Physics & Technology Jan 01, 2010

Galvanic chaos in a CO2laser discharge: A new look...

on Optics Communications Jan 01, 1987
More articles like this..