OPUS 4 | Arbeitsergebnisse / Universität Bayreuth, Abteilung Mikrometeorologie

Arbeitsergebnisse / Universität Bayreuth, Abteilung Mikrometeorologie

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45
Complex TERRain and ECOlogical Heterogeneity (TERRECO);WP 1-02: Spatial assessment of atmosphere-ecosystem exchanges via micrometeorological measurements, footprint modeling and mesoscale simulations ; Documentation of the Observation Period May 12th to Nov. 8th, 2010, Haean, South Korea (2011)
Peng Zhao Johannes Lüers Johannes Olesch Thomas Foken: no abstract

35
Documentation of reference data for the experimental areas of the Bayreuth Centre for Ecology and Environmental Research (BayCEER) at the Waldstein site (2007)
Katharina Staudt Thomas Foken: no abstract

36
ExchanGE processes in mountainous Regions (EGER)- Documentation of the Intensive Observation Period (IOP1) September, 6th to October, 7th 2007 (2008)
Andrei Serafimovich Lukas Siebicke Katharina Staudt Johannes Lüers Tobias Biermann Stephanie Schier Thomas Foken: no abstract

47
ExchanGE processes in mountainous Regions (EGER)- Documentation of the Intensive Observation Period (IOP3) June, 13th to July, 26th 2011 (2011)
Andrei Serafimovich Fabian Eder Jörg Hübner Eva Falge Linda Voß Matthias Sörgel Andreas Held Qianqian Liu Rafael Eigenmann Kilian Huber Henrique F. Duarte Peter Werle Eckhard Gast Stanislaw Cieslik Liu Heping Thomas Foken

51
Whole-air relaxed eddy accumulation for the measurement of isotope and trace-gas fluxes (2012)
Johannes Ruppert Michael Riederer Willi A. Brand Thomas Foken: Measuring the isotopic composition of trace gas fluxes can provide additional information on ecosystem gas exchange, when ecosystem processes, like assimilation, discriminate against heavier isotopes. In the case of CO2 exchange, different mass-balances for bulk CO2 and its 13CO2 or CO18O isotopes can be used to separate respiration from photosynthetic assimilation. Up to now, detectors for direct isotope measurements in the field lack the precision needed for fast eddy covariance (EC) flux measurements. The collection of updraft and downdraft whole-air samples using the relaxed eddy accumulation technique (REA) allows simultaneously determining trace gas concentrations and isotope ratios by high precision laboratory analysis. At the same time whole-air REA relaxes several of the technical problems related to REA sampling on traps. In tests using air from a tank the complete whole-air REA sampling system and its foil balloon bag reservoirs showed no signs of contamination after cleaning. The standard deviations of δ13C and δ18O isotope ratios were only slightly higher than the precision specified for the laboratory analysis procedure. First experiment results showed that isotopic differences (up-drafts−downdrafts) were large enough to yield signal to noise ratios greater than five when applying hyperbolic deadbands during REA sampling (HREA). The performance of the instrument and the HREA sampling method are investigated by simulation of the sampling process for bulk CO2, which serves as proxy scalar. Measurements by whole-air HREA in combination with high precision isotope analysis can quantify the isofluxes of 13CO2 and CO18O. Furthermore, additional information is collected on the scalar correlation of bulk CO2 and its stable isotopes, which represents the relatively short timescale of updrafts and downdrafts in the turbulent exchange above an ecosystem. This information is essential to check the scalar similarity assumptions made in the HREA and EC/flask method for the quan-tification of isofluxes.

34
COPS experiment - Convective and orographically induced precipitation study, 01 June 2007 – 31 August 2007 (2007)
Stefan Metzger Thomas Foken: no abstract

23
Dokumentation des Experiments LITFASS-2003,19.05.2003 bis 20.06.2003; Dokumentation des Experiments GRASATEM-2003, 14.05.2003 bis 01.06.2003 (2003)
Matthias Mauder Thomas Foken Matthias Göckede Claudia Liebethal Johannes Ruppert Theresa Bertolini: keine Zusammenfassung

22
Dokumentation des Experiments EVA_GRIPS - 27.05.2002 bis 10.06.2002 (2003)
Matthias Mauder Thomas Foken Matthias Göckede: keine Zusammenfassung

26
Documentation and Instruction Manual of the Eddy Covariance Software Package TK2 (2004)
Matthias Mauder Thomas Foken: no abstract

46
Documentation and Instruction Manual of the Eddy-Covariance Software Package TK3 (2011)
Matthias Mauder Thomas Foken: no abstract

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Arbeitsergebnisse / Universität Bayreuth, Abteilung Mikrometeorologie

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