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| Titel |
Three years of semicontinuous greenhouse gas measurements at the Puy de Dôme station (central France) |
| VerfasserIn |
M. López, M. Schmidt, M. Ramonet, J.-L. Bonne, A. Colomb, V. Kazan, P. Laj, J.-M. Pichon |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 8, no. 9 ; Nr. 8, no. 9 (2015-09-25), S.3941-3958 |
| Datensatznummer |
250116587
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| Publikation (Nr.) |
 copernicus.org/amt-8-3941-2015.pdf |
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| Zusammenfassung |
| Three years of greenhouse gas measurements, obtained using a gas
chromatograph (GC) system located at the Puy de Dôme station at
1465 m a.s.l. in central France, are presented. The GC
system was installed in 2010 at Puy de Dôme and was designed for
automatic and accurate semicontinuous measurements of atmospheric
carbon dioxide, methane, nitrous oxide and sulfur hexafluoride mole
fractions. We present in detail the instrumental setup and the
calibration strategy, which together allow the GC to reach
repeatabilities of 0.1 μmol mol−1, 1.2 nmol mol−1,
0.3 nmol mol−1 and 0.06 pmol mol−1 for
CO2, CH4, N2O and SF6, respectively.
The analysis of the 3-year atmospheric time series revealed how the planetary
boundary layer height drives the mole fractions observed at
a mountain site such as Puy de Dôme where air masses alternate
between the planetary boundary layer and the free troposphere.
Accurate long-lived greenhouse gas measurements collocated with
222Rn measurements as an atmospheric tracer allowed us to
determine the CO2, CH4 and N2O emissions in
the catchment area of the station. The derived CO2 surface
flux revealed a clear seasonal cycle, with net uptake by plant
assimilation in the spring and net emission caused by the biosphere
and burning of fossil fuel during the remainder of the year. We
calculated a mean annual CO2 flux of
1310 ± 680 t CO2 km−2. The derived CH4 and
N2O emissions in the station catchment area were
7.0 ± 4.0 t CH4 km−2 yr−1 and
1.8 ± 1.0 t N2O km−2 yr−1, respectively. Our derived
annual CH4 flux is in agreement with the national French
inventory, whereas our derived N2O flux is 5 times larger
than the same inventory. |
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