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Measurement of Radiocarbon Content in Leaves from Some Japanese Sites

Published online by Cambridge University Press:  18 July 2016

Yasushi Muraki
Affiliation:
Solar-Terrestrial Environment Laboratory, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
Kimiaki Masuda*
Affiliation:
Solar-Terrestrial Environment Laboratory, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
Kh A Arslanov
Affiliation:
Solar-Terrestrial Environment Laboratory, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan On leave from Geographical Research Institute, St. Petersburg University, Sredniy Prospect 41, St. Petersburg 199004, Russia
Hiroaki Toyoizumi
Affiliation:
Solar-Terrestrial Environment Laboratory, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
Masataka Kato
Affiliation:
Solar-Terrestrial Environment Laboratory, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
Yukiko Naruse
Affiliation:
Solar-Terrestrial Environment Laboratory, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
Takuya Murata
Affiliation:
Solar-Terrestrial Environment Laboratory, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
Tohru Nishiyama
Affiliation:
Solar-Terrestrial Environment Laboratory, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
*
Corresponding author. Email: [email protected].
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Abstract

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We have measured radiocarbon contents in leaves collected from 15 sites in Japan, including mountain areas and big city areas for last three years. Comparing the radiocarbon contents in various areas, high 14C concentrations (80–100‰ as δ14C) are seen for the leaves from the mountain and country sites. On the contrary, low concentrations (5–40‰) were observed for the leaves from city region, especially near the road with heavy traffic. These results indicate that the atmosphere of the mountain and country sites in Japan is still clean but the CO2 gas coming from fossil non-radioactive carbon significantly pollutes the atmosphere of the city sites. The value of δ14C for the mountain areas implies that 14C produced by nuclear bomb test in 1960s still remains. The decrease of δ14C at heavy traffic sites in Tokyo is consistent with the increase of CO2 concentration in the atmosphere assuming that almost all CO2 gas in this region originates from the fossil fuel.

Type
I. Our ‘Dry’ Environment: Above Sea Level
Copyright
Copyright © 2001 by the Arizona Board of Regents on behalf of the University of Arizona 

References

Arslanov, KhA, Tertychnaya, TV, Chernov, SB. 1993. Problems and methods of dating low-activity samples by liquid scintillation counting. Radiocarbon 35(3): 393–8.Google Scholar
Keeling, CD, Whorf, TP, Wahlen, M, van der Plicht, J. 1995. Interannual extremes in the rate of rise of atmospheric carbon dioxide since 1980. Nature 375:666–9.CrossRefGoogle Scholar
Komeiji, T, Soufuku, M, Sueoka, S, Izumikawa, S, Yoshioka, H, Akiyama, K, Yokota, H, Sugiyama, T, Iwasaki, Y. 1999. Characteristic of carbon dioxide concentration in urban area. The Tokyo Metropolitan Research Institute for Environmental Protection Annual Report 98.Google Scholar
Krajcar-Bronić, I, Horvatinčić, N, Obelić, B. 1998. Two decades of environmental isotope records in Croatia, Reconstruction of the past and prediction of future levels. Radiocarbon 40(1):399416.Google Scholar
Kuc, T, Zimnoch, M. 1998. Changes of the CO2 sources and sinks in a polluted urban area (southern Poland) over the last decade, derived from the carbon isotope composition. Radiocarbon 40(1):417–23.Google Scholar
Leung, PL, Stokes, MJ, Qiu, SH, Cai, LZ. 1995. A survey of environmental 14C levels in Hong Kong. Radiocarbon 37(2):505–8.Google Scholar
Levin, I, Graul, R, Trivett, NBA. 1995. Long-term observations atmospheric CO2 and carbon isotopes at continental sites in Germany. Tellus 47B:2334.Google Scholar
Levin, I, Kromer, B. 1997. Twenty years of atmospheric 14CO2 observations at Schauinsland station, Germany. Radiocarbon 39(2):205–18.Google Scholar
McNeely, R. 1994. Long-term environmental monitoring of 14C levels in the Ottawa region. Environment International 20(5):675–9.Google Scholar
Meijer, HAJ, van der Plicht, J, Gislefoss, JS, Nydal, R. 1995. Comparing long-term atmospheric 14C and 3H records near Groningen, the Netherlands with Fruholmen, Norway and Izaña, Canary Islands 14C stations. Radiocarbon 37(1):3950.CrossRefGoogle Scholar
Muraki, Y, Kocharov, G, Nishiyama, T, Naruse, Y, Murata, T, Masuda, K. 1998. The new Nagoya radiocarbon laboratory. Radiocarbon 40(1): 177–82.Google Scholar
Nakazawa, T. 1997. Variations of carbon dioxide and methane in the atmosphere and their global cycles. Global Environmental Research 2(1):514.Google Scholar
Nakazawa, T, Morimoto, S, Aoki, S, Tanaka, M. 1997. Temporal and spatial variations of the carbon isotopic ratio of atmospheric carbon dioxide in the western Pacific region. Journal of Geophysical Research 102(D1): 1271–85.Google Scholar
Nydal, R, Lövseth, K. 1996. Carbon-14 measurements in atmospheric CO2 from Northern and Southern Hemisphere sites, 1962–1993. Oak Ridge National Laboratory NDP-057.Google Scholar
Rozanski, K, Stichler, W, Gonfiantini, R, Scott, EM, Beukens, RP, Kromer, B, van der Plicht, J. 1992. The IAEA 14C intercomparison exercise 1990. Radiocarbon 34(3):506–19.Google Scholar
Stuiver, M, Polach, H. 1977. Discussion: reporting of 14C data. Radiocarbon 19(3):355–63.Google Scholar