Reconstructing Atmospheric CO2 Concentration Using Its Relationship with Carbon Isotope Variations in Annual Tree Ring of Red Pine
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참고문헌
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초록
Carbon isotope ratio (13C/12C, expressed as δ13C) of tree ring can be proxy of atmospheric CO2 concentration ([CO2]) due to the inter-correlation between atmospheric [CO2], δ13C of atmospheric CO2, and δ13C of plant tissue that assimilates atmospheric CO2. This study was conducted to investigate if δ13C of tree ring of Pinus densiflora in polluted area may show a lower value than that in unpolluted area and to explore the possibility of reconstructing atmospheric [CO2] using its relationship with δ13C of tree ring. During the period between 1999 and 2005, δ13C of tree annual ring tended to decrease over time, and the δ13C in polluted area (-27.2‰ in 2009 to -28.3‰ in 2005) was significantly (P<0.001) lower than that (-26.0‰ in 1999 to -27.1‰ in 2005) in unpolluted area. This reflects a greater emission of CO2 depleted in 13C in the polluted area. Atmospheric [CO2] was significantly (P<0.01) correlated with δ13C of tree ring in a linear fashion. Using the linear regression equation, atmospheric [CO2] in the polluted area was estimated to range from 392.3 ppm in 1999 to 410.9 ppm in 2005, and these values were consistently higher than the national atmospheric [CO2] monitored at the Anmyoundo meteorological station (from 370.7 ppm in 1999 to 387.2 ppm in 2005). Our study suggested that it is possible to reconstruct atmospheric [CO2] in a certain area using the relationship between tree ring δ13C and atmospheric [CO2].
Abstract
Carbon isotope ratio (13C/12C, expressed as δ13C) of tree ring can be proxy of atmospheric CO2 concentration ([CO2]) due to the inter-correlation between atmospheric [CO2], δ13C of atmospheric CO2, and δ13C of plant tissue that assimilates atmospheric CO2. This study was conducted to investigate if δ13C of tree ring of Pinus densiflora in polluted area may show a lower value than that in unpolluted area and to explore the possibility of reconstructing atmospheric [CO2] using its relationship with δ13C of tree ring. During the period between 1999 and 2005, δ13C of tree annual ring tended to decrease over time, and the δ13C in polluted area (-27.2‰ in 2009 to -28.3‰ in 2005) was significantly (P<0.001) lower than that (-26.0‰ in 1999 to -27.1‰ in 2005) in unpolluted area. This reflects a greater emission of CO2 depleted in 13C in the polluted area. Atmospheric [CO2] was significantly (P<0.01) correlated with δ13C of tree ring in a linear fashion. Using the linear regression equation, atmospheric [CO2] in the polluted area was estimated to range from 392.3 ppm in 1999 to 410.9 ppm in 2005, and these values were consistently higher than the national atmospheric [CO2] monitored at the Anmyoundo meteorological station (from 370.7 ppm in 1999 to 387.2 ppm in 2005). Our study suggested that it is possible to reconstruct atmospheric [CO2] in a certain area using the relationship between tree ring δ13C and atmospheric [CO2].
참고문헌 (20)
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