Journal
ATMOSPHERIC ENVIRONMENT
Volume 45, Issue 5, Pages 1168-1174Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2010.10.015
Keywords
Atmospheric CO2; Carbon isotope; Oxygen isotope; Laser spectroscopy; CO2 source
Funding
- Japan Society for the Promotion of Science
- Grants-in-Aid for Scientific Research [20120007] Funding Source: KAKEN
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We report the application of Mid-IR laser spectroscopy to differentiation of CO2 sources. High-frequency isotopic CO2 measurements (delta C-13 and delta O-18) in urban air in Nagoya allow for the contributions of anthropogenic and biogenic CO2 sources to be differentiated. The laser spectroscopic method, using a Mid-IR quantum cascade laser, provides us with the advantage of higher temporal resolution of the data compared to traditional isotope ratio mass spectroscopy. The relative contribution of CO2 sources in Nagoya was found to be roughly 0.42, 0.33 and 0.25 for natural combustion, gasoline combustion and biogenic respiration in the spring, but with large short-term (hourly) variations dependent on wind direction, and long-term variations dependent on heating demand and biological seasonality. (C) 2010 Elsevier Ltd. All rights reserved.
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