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| Titel |
Continuous atmospheric CO2 and its δ13C measurements (2012-2014) at Environment Research Station Schneefernerhaus, Germany |
| VerfasserIn |
Homa Ghasemifard, Ye Yuan, Marvin Luepke, Jia Chen, Ludwig Ries, Annette Menzel |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250139112
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| Publikation (Nr.) |
 EGU/EGU2017-2288.pdf |
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| Zusammenfassung |
| This study presents continuous measurement of atmospheric CO2 and δ13C by PICARRO
Wavelength-Scanned Cavity Ring Down Spectrometer (WS-CRDS, G1101- i) for a period of
two and a half years at the remote Global Atmosphere Watch (GAW) site Environment
Research Station Schneefernerhaus (UFS, Germany, 2650 m a.s.l). Both water vapor and
methane concentration show spectroscopic interferences with CO2 and δ13C in this
measuring device. Without analyzer upgrade to account automatically for these
effects, we present approaches for corrections for δ13C and CO2 mixing ratio as
well as test the precision and stability of the device. The mean annual cycle from
May 2012 to November 2014 exhibited peak-to-peak amplitudes of 13.34 ppm
for CO2 and 1.82 ‰ for δ13C. Regarding CO2 mean diurnal cycle, daily maxima
occurred around noon and daily minima in the afternoon. However, clear seasonal
differences can be observed. For δ13C, the minimum of diurnal cycle occurred
in the morning and the maximum in the afternoon with peak-to peak amplitude
of around 0.4 ‰ in summer, 0.2 ‰ both in spring and autumn and no diurnal
cycle in winter. HYSPLIT (Hybrid Single Particle Lagrangian Integrated Trajectory
Model) was used to calculate 96 hours backward trajectories reaching at UFS with
an altitude of 1500 m a.g.l to characterize the origin of air masses transported to
the site. Trajectories clustering resulted in five major directions, which were from
west (41.2 %), southwest (14.8 %), northwest (19.7 %), southeast (12.5 %) and
northeast (11.8 %). Wind speed and wind direction showed clear influences on CO2
mixing ratio. Higher levels of CO2 mixing ratio were measured at wind speeds
higher than 6 m s−1 from the northwest, northeast and southwest. The research is
financed by the Bavarian State Ministry of the Environment and Consumer Protection. |
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