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Balance and Behavior of Carbon Dioxide at an Urban Forest Inferred from the Isotopic and Meteorological Approaches

Published online by Cambridge University Press:  18 July 2016

Hiroshi Aoki Takahashi
Department of Earth and Planetary Sciences, Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan Present affiliation: Research Center for Deep Geological Environments, Geological Survey of Japan, AISI, Tsakuba 305-8567, Japan. Email:
Tetsuya Hiyama
Institute of Hydrospheric-Atmospheric Science, Nagoya University, Nagoya 464-8601, Japan.
Eiichi Konohira
Institute of Hydrospheric-Atmospheric Science, Nagoya University, Nagoya 464-8601, Japan.
Atsuhiro Takahashi
Department of Earth and Planetary Sciences, Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan
Naohiro Yoshida
Department of Environmental Sciences and Technology, Titech, Yokohama 266-8502, Japan. Also with CREST Project, Japan Science and Technology Corporation.
Toshio Nakamura
Center for Chronological Research, Nagoya University, Nagoya 464-8602, Japan
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Diurnal variations in δ14C, δ13C and the concentration of atmospheric carbon dioxide in an urban forest were measured on 9 February 1999 to discriminate and quantify contributions from different CO2 sources. The biogenic CO2 concentration remained relatively constant throughout the day. However, anthropogenic CO2 concentration fluctuated with the atmospheric CO2 concentration, and seemed to be controlled by wind velocity and the amount of exhaust gases from fossil fuel burning. The vertical profiles of anthropogenic, biogenic, and total CO2 showed a constant concentration within forest during daytime because of the large vertical CO2 influx, strong winds, and neutral atmospheric condition. The biogenic contribution at night decreased from the forest floor upwards with a smooth gradient, while the anthropogenic contribution showed a direct mirror because of the location of respective CO2 sources—the vertical gradient of wind velocity and the horizontal CO2 supply.

I. Our ‘Dry’ Environment: Above Sea Level
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