Net CO 2 surface emissions at Bern, Switzerland inferred from ambient observations of CO 2 , δ(O 2 /N 2 ), and 222 Rn using a customized radon tracer inversion

van der Laan, Sander; van der Laan-Luijkx, I. T.; Zimmermann, L.; Conen, F.; Leuenberger, Markus (2014). Net CO 2 surface emissions at Bern, Switzerland inferred from ambient observations of CO 2 , δ(O 2 /N 2 ), and 222 Rn using a customized radon tracer inversion. Journal of Geophysical Research: Atmospheres, 119(3), pp. 1580-1591. American Geophysical Union 10.1002/2013JD020307

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The 222Radon tracer method is a powerful tool to estimate local and regional surface emissions of, e.g., greenhouse gases. In this paper we demonstrate that in practice, the method as it is commonly used, produces inaccurate results in case of nonhomogeneously spread emission sources, and we propose a different approach to account for this. We have applied the new methodology to ambient observations of CO2 and 222Radon to estimate CO2 surface emissions for the city of Bern, Switzerland. Furthermore, by utilizing combined measurements of CO2 and δ(O2/N2) we obtain valuable information about the spatial and temporal variability of the main emission sources. Mean net CO2 emissions based on 2 years of observations are estimated at (11.2 ± 2.9) kt km−2 a−1. Oxidative ratios indicate a significant influence from the regional biosphere in summer/spring and fossil fuel combustion processes in winter/autumn. Our data indicate that the emissions from fossil fuels are, to a large degree, related to the combustion of natural gas which is used for heating purposes.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Climate and Environmental Physics
10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)

UniBE Contributor:

van der Laan, Sander and Leuenberger, Markus

Subjects:

500 Science > 530 Physics

ISSN:

2169-897X

Publisher:

American Geophysical Union

Language:

English

Submitter:

Doris Rätz

Date Deposited:

25 Sep 2014 15:19

Last Modified:

13 Dec 2014 17:11

Publisher DOI:

10.1002/2013JD020307

BORIS DOI:

10.7892/boris.47371

URI:

https://boris.unibe.ch/id/eprint/47371

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