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| Titel |
European source and sink areas of CO2 retrieved from Lagrangian transport model interpretation of combined O2 and CO2 measurements at the high alpine research station Jungfraujoch |
| VerfasserIn |
C. Uglietti, M. Leuenberger, D. Brunner |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 11, no. 15 ; Nr. 11, no. 15 (2011-08-08), S.8017-8036 |
| Datensatznummer |
250009989
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| Publikation (Nr.) |
 copernicus.org/acp-11-8017-2011.pdf |
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| Zusammenfassung |
The University of Bern monitors carbon dioxide (CO2) and oxygen (O2) at the High
Altitude Research Station Jungfraujoch since the year 2000 by means of flasks sampling and
since 2005 using a continuous in situ measurement system. This study investigates the transport
of CO2 and O2 towards Jungfraujoch using backward Lagrangian Particle Dispersion Model (LPDM)
simulations and utilizes CO2 and O2 signatures to classify air masses. By
investigating the simulated transport patterns associated with distinct CO2 concentrations it is
possible to decipher different source and sink areas over Europe. The highest CO2 concentrations, for example, were observed in winter during pollution episodes when air was
transported from Northeastern Europe towards the Alps, or during south Foehn events with
rapid uplift of polluted air from Northern Italy, as demonstrated in two case studies.
To study the importance of air-sea exchange for variations in O2 concentrations at
Jungfraujoch the correlation between CO2 and APO (Atmospheric Potential Oxygen)
deviations from a seasonally varying background was analyzed. Anomalously high APO
concentrations were clearly associated with air masses originating from the Atlantic Ocean,
whereas low APO concentrations were found in air masses advected either from the east from
the Eurasian continent in summer, or from the Eastern Mediterranean in winter. Those air
masses with low APO in summer were also strongly depleted in CO2 suggesting
a combination of CO2 uptake by vegetation and O2 uptake by dry summer
soils. Other subsets of points in the APO-CO2 scatter plot investigated with
respect to air mass origin included CO2 and APO background values and points with
regular APO but anomalous CO2 concentrations. Background values were associated with
free tropospheric air masses with little contact with the boundary layer during the last few
days, while high or low CO2 concentrations reflect the various levels of influence
of anthropogenic emissions and the biosphere. The pronounced cycles of CO2
and O2 exchanges with the biosphere and the ocean cause clusters of points and lead to a seasonal
pattern. |
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