Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 9 4 2009 10.5194/acpd-9-16913-2009 http://www.atmos-chem-phys-discuss.net/9/16913/2009/ http://www.atmos-chem-phys-discuss.net/9/16913/2009/acpd-9-16913-2009.html http://www.atmos-chem-phys-discuss.net/9/16913/2009/acpd-9-16913-2009.pdf 16913 16939 2009-08-10 The effect of misleading surface temperature estimations on the sensible heat fluxes at a high Arctic site &ndash; the Arctic turbulence experiment 2006 on Svalbard (ARCTEX-2006) J. Lüers johannes.lueers@uni-bayreuth.de J. Bareiss Department of Micrometeorology, University of Bayreuth, Germany The observed rapid climate warming in the Arctic requires improvements in permafrost and carbon cycle monitoring, accomplished by setting up long-term observation sites with high-quality in-situ measurements of turbulent heat, water and carbon fluxes as well as soil physical parameters in an Arctic landscape. But accurate quantification and well adapted parameterizations of turbulent fluxes in polar environments presents fundamental problems in soil-snow-ice-vegetation-atmosphere interaction studies. One of these problems is the accurate estimation of the surface or aerodynamic temperature <i>T</i>₍₀₎ required to force most of the bulk aerodynamic formula currently used. Results from the Arctic-Turbulence-Experiment (ARCTEX-2006) performed on Svalbard during the winter/spring transition 2006 helped to better understand the physical exchange and transport processes of energy. The existence of an untypical temperature profile close to the surface in the Arctic spring at Svalbard could be proven to be one of the major issues hindering estimation of the appropriate surface temperature. Thus, it is essential to adjust the set-up of measurement systems carefully when applying flux-gradient methods that are commonly used to force atmosphere-ocean/land-ice models. 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