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Discussion papers
https://doi.org/10.5194/acp-2018-850
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2018-850
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 30 Aug 2018

Research article | 30 Aug 2018

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

On the diurnal, weekly, seasonal cycles and annual trends in atmospheric CO2 at Mount Zugspitze, Germany during 1981–2016

Ye Yuan1, Ludwig Ries2, Hannes Petermeier3, Thomas Trickl4, Michael Leuchner1,5, Cédric Couret2, Ralf Sohmer2, Frank Meinhardt6, and Annette Menzel1,7 Ye Yuan et al.
  • 1Department of Ecology and Ecosystem Management, Technical University of Munich (TUM), Freising, Germany
  • 2German Environment Agency (UBA), Zugspitze, Germany
  • 3Department of Mathematics, Technical University of Munich (TUM), Garching, Germany
  • 4Institute of Meteorology and Climate Research, Atmospheric Environmental Research (IMK - IFU), Karlsruhe Institute of Technology (KIT), Garmisch-Partenkirchen, Germany
  • 5Springer Nature B.V., Dordrecht, the Netherlands
  • 6German Environment Agency (UBA), Schauinsland, Germany
  • 7Institute for Advanced Study, Technical University of Munich (TUM), Garching, Germany

Abstract. A continuous, 36-year measurement record of atmospheric carbon dioxide (CO2) at three measurement sites of Mount Zugspitze, Germany was studied. The CO2 trend and seasonality were analyzed by decomposing the long-term time series into trend and seasonal components. The mean CO2 annual growth rate over the 36 year period at Zugspitze is 1.8ppmyr−1, which is in good agreement with the Mauna Loa station and the global means. The peak-to-trough amplitude of the mean CO2 seasonal cycle is 11.67ppm at Mount Zugspitze, which is significantly less than nearby measurement sites at Mount Wank and Schauinsland, but which follow similar patterns. To characterize this mountain site better, analyses of weekly periodicity and the diurnal cycle were performed to provide evidence of local sources and sinks of CO2. Together, with an atmospheric trace gas (CO and NO) and the number of site visitor case study, clear weekday–weekend differences were detected, indicating potential CO2 sources in the near vicinity.

Ye Yuan et al.
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In this study, we presented a time series analysis of a 36-year CO2 measurement record at Mount Zugspitze in Germany. Compared with other GAW Observatories, Zugspitze proves to be a highly suitable site for monitoring background levels of air components with proper data selection procedures. Detailed analyses of long-term trend and seasonality, as well as a thorough study combined weekly periodicity and diurnal cycles were made.
In this study, we presented a time series analysis of a 36-year CO2 measurement record at Mount...
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