Atmos. Chem. Phys. Discuss., 11, 26245-26345, 2011
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
ExchanGE processes in mountainous Regions (EGER) – overview of design, methods, and first results
T. Foken1,g, F. X. Meixner2,4, E. Falge2, C. Zetzsch3,g, A. Serafimovich1,g, A. Bargsten2, T. Behrendt2, T. Biermann1, C. Breuninger2, S. Dix1,a, T. Gerken1, M. Hunner1,a, L. Lehmann-Pape2, K. Hens2, G. Jocher1,b, J. Kesselmeier2, J. Lüers1,g, J.-C. Mayer2, A. Moravek2, D. Plake2, M. Riederer1, F. Rütz1, M. Scheibe2,c, L. Siebicke1,d, M. Sörgel3, K. Staudt1,e, I. Trebs2, A. Tsokankunku2, M. Welling2, V. Wolff2,e, and Z. Zhu2,f
1University of Bayreuth, Department of Micrometeorology, 95440 Bayreuth, Germany
2Max-Planck-Institute of Chemistry, Biogeochemistry Department, P.O. Box 3060, 55020 Mainz, Germany
3University of Bayreuth, Atmospheric Chemistry Research Laboratory, 95440 Bayreuth, Germany
4University of Zimbabwe, Department of Physics, P.O. Box MP 167, Mount Pleasant, Harare, Zimbabwe
anow at: TÜV Süd Industrie Service GmbH Wind Cert Services, Ludwig-Eckert-Straße 10, 93049 Regensburg, Germany
bnow at: Alfred-Wegener Institute for Polar and Marine Research, Telegrafenberg A43, 14473, Potsdam, Germany
cnow at: German Aerospace Center (DLR), Institute of Atmospheric Physics, Münchner Straße 20, 82234 Oberpfaffenhofen-Wessling, Germany
dnow at: Institut national de la recherche agronomique (INRA), BP 709, 97387 Cedex Kourou, French Guiana
enow at: Agroscope ART Research Station, Reckenholzstrasse 191, 8046 Zürich, Switzerland
fnow at: Institute for Geographic Sciences and Natural Resources Research, ChineseAcademy of Sciences (CAS), A11 Datun Road, Anwai, Beijing 100101, China
gMember of Bayreuth Center of Ecology and Environmental Research (BayCEER), University of Bayreuth, 95440 Bayreuth, Germany

Abstract. To investigate the energy, matter and reactive and non-reactive trace gas exchange between the atmosphere and a spruce forest in the German mountain region, two intensive measuring periods were conducted at the FLUXNET site Waldstein-Weidenbrunnen in September/October 2007 and June/July 2008. They were part of the project "ExchanGE processes in mountainous Regions" (EGER). Beyond a brief description of the experiment and links to the already published results of both experiments, the main focus of the paper is the problem of the coupling of the trunk space, the canopy and the atmosphere. Therefore, the relevant coherent structures were analyzed in different canopy levels and an already published coupling classification was applied to gradients and fluxes. It could be shown that fluxes above the canopy are only related to the gradient between the canopy and the atmosphere in the case of a fully coupled system. Changes in the concentration of especially reactive trace gases (NO-NO2-O3 and HONO) could only be interpreted together with the coupling stage. Finally it was pointed out that the combination of air chemical measurements with micrometeorological turbulence measurements is urgently needed to understand the biosphere-atmosphere interaction.

Citation: Foken, T., Meixner, F. X., Falge, E., Zetzsch, C., Serafimovich, A., Bargsten, A., Behrendt, T., Biermann, T., Breuninger, C., Dix, S., Gerken, T., Hunner, M., Lehmann-Pape, L., Hens, K., Jocher, G., Kesselmeier, J., Lüers, J., Mayer, J.-C., Moravek, A., Plake, D., Riederer, M., Rütz, F., Scheibe, M., Siebicke, L., Sörgel, M., Staudt, K., Trebs, I., Tsokankunku, A., Welling, M., Wolff, V., and Zhu, Z.: ExchanGE processes in mountainous Regions (EGER) – overview of design, methods, and first results, Atmos. Chem. Phys. Discuss., 11, 26245-26345, doi:10.5194/acpd-11-26245-2011, 2011.
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