Measurements of CO2, its stable isotopes, O2/N2, and 222Rn at Bern, Switzerland

Sturm, P.; Leuenberger, M.; Valentino, F. L.; Lehmann, B.; Ihly, B. (2006). Measurements of CO2, its stable isotopes, O2/N2, and 222Rn at Bern, Switzerland. Atmospheric chemistry and physics, 6(7), pp. 1991-2004. European Geosciences Union 10.5194/acp-6-1991-2006

[img]
Preview
Text
sturm06acp.pdf - Published Version
Available under License Creative Commons: Attribution-Noncommercial-Share Alike (CC-BY-NC-SA).

Download (1MB) | Preview

A one-year time series of atmospheric CO2 measurements from Bern, Switzerland, is presented. O2/N2 and Ar/N2 ratios as well as stable carbon and oxygen isotopes of CO2 and δ29N2, δ34O2 and δ36Ar were measured periodically during a one year period. Additionally, the 222Rn activity was measured during three months in the winter 2004. Using the correlation from short-term fluctuations of CO2 and 222Rn we estimated a mean CO2 flux density between February 2004 and April 2004 in the region of Bern of 95±39 tC km–2month–1. The continuous observations of carbon dioxide and associated tracers shed light on diurnal and seasonal patterns of the carbon cycle in an urban atmosphere. There is considerable variance in nighttime δ13C and δ18O of source CO2 throughout the year, however, with generally lower values in winter compared to summertime. The O2:CO2 oxidation ratio during the nighttime build-up of CO2 varies between –0.96 and –1.69 mol O2/mol CO2. Furthermore, Ar/N2 measurements showed that artifacts like thermal fractionation at the air intake are relevant for high precision measurements of atmospheric O2.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Climate and Environmental Physics

UniBE Contributor:

Leuenberger, Markus; Valentino, Francesco Luca; Lehmann, Bernhard and Ihly, Beat

Subjects:

500 Science > 530 Physics

ISSN:

1680-7316

Publisher:

European Geosciences Union

Language:

English

Submitter:

BORIS Import 2

Date Deposited:

30 Sep 2021 12:09

Last Modified:

05 Dec 2022 15:52

Publisher DOI:

10.5194/acp-6-1991-2006

BORIS DOI:

10.48350/158858

URI:

https://boris.unibe.ch/id/eprint/158858

Actions (login required)

Edit item Edit item
Provide Feedback