Radiocarbon method in environmental monitoring of CO₂ emission

详细信息    查看全文

• 作者：Andrzej Z. Rakowski^a ; ^b ; ^{arakowski@leibniz.uni-kiel.de} ; Marie-Josee Nadeau^a ; Toshio Nakamura^c ; Anna Pazdur^b ; S?awomira Pawe?czyk^b ; Natalia Piotrowska^b
• 关键词：Suess effect ; AMS ; Radiocarbon ; Fossil fuel component ; Atmospheric CO2
• 刊名：Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
• 出版年：2013
• 出版时间：January, 2013
• 年：2013
• 卷：294
• 期：Complete
• 页码：503-507
• 全文大小：485 K

文摘

New results of carbon isotopic composition from tree rings have been analyzed. ¦¤¹⁴C and ¦Ä¹³C data, representing the isotopic composition of carbon in ¡°clean air¡±, were obtained from annual rings of a pine tree (Pinus sylvestris) taken in the Niepo?omice area, 25 km east Krak¨®w, Poland. All samples were processed to extract ¦Á-cellulose, and the radiocarbon concentration in each annual ring was measured using AMS at the University of Nagoya. Stable isotopic composition of carbon was determined using isotope ratio mass spectrometry. The dataset covers the growth period between 1960 and 2003. The average difference between radiocarbon concentrations in Niepo?omice and the North Hemisphere zone 1 (NH zone 1) for the period between 1960 and 1999 is 3.5 ¡À 1.6¡ë. These data are compared with previously presented results from the city of Krak¨®w, where a local decrease in ¹⁴C concentration was observed due to local CO₂ emission from fossil fuel use. The differences in observed ¹⁴C concentrations were used to estimate a magnitude of the local Suess effect in Krak¨®w. Based on mass balance equations for CO₂ ¹⁴C concentrations, it was possible to calculate the CO₂ concentration associated with fossil fuel emission (C_foss) into the atmosphere. The highest values of C_foss were recorded in the years 1986 (11.9 ¡À 1.4 ppm V) and 1983 (8.1 ¡À 1.3 ppm V), while the lowest value of 0.6 ¡À 1.8 ppm V was recorded in 2001.