 |
| Titel |
Measurements of CO₂, its stable isotopes, O₂/N₂, and ²²²Rn at Bern, Switzerland |
| VerfasserIn |
P. Sturm, M. Leuenberger, F. L. Valentino, B. Lehmann, B. Ihly |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 6, no. 7 ; Nr. 6, no. 7 (2006-06-08), S.1991-2004 |
| Datensatznummer |
250003902
|
| Publikation (Nr.) |
 copernicus.org/acp-6-1991-2006.pdf |
|
|
|
|
|
| Zusammenfassung |
| 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. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|