caa a22 4500 475777786 CHVBK 20180406123636.0 cr unu---uuuuu 170329e20001001xx s 000 0 eng 10.1023/A:1002702810929 doi (NATIONALLICENCE)springer-10.1023/A:1002702810929 Footprint Analysis For Measurements Over A Heterogeneous Forest [Elektronische Daten] [Ü Rannik, M. Aubinet, O. Kurbanmuradov, K. Sabelfeld, T. Markkanen, T. Vesala] The air flow and vertical distribution of sources/sinks inside aforest canopy have been taken into accountin the analysis of the contribution of sources/sinks to measured fluxes and concentrations above a forest. Thestochastic estimators for concentrations and fluxes are described and their evaluation is performed by simulationof an ensemble of fluid parcel trajectories. The influence of the forest canopy on the footprint is important forobservation levels up to a few times the forest height. The influence of along-wind turbulent diffusion, whichanalytical atmospheric surface layer (ASL) footprint models do not account for, is significant even at higherlevels. The footprint analysis has been performed to deduce the Douglas fir canopy carbon dioxide uptake from eddycovariance flux measurements above a mixed Douglas fir-beech forest during the pre-leaf periods of the beech.The scatter in the results indicates that such an analysis is limited, presumably due to horizontal inhomogenetiesin flow statistics, which were not included in trajectory simulation. The analysis, however, is useful for theestimation of the qualitative effect of the forest canopy on the footprint function. Kluwer Academic Publishers, 2000 Concentrations and fluxes nationallicence Douglas fir nationallicence Footprints nationallicence Forest canopy nationallicence Lagrangian trajectory simulation nationallicence Stochastic estimators nationallicence Rannik Ü. Department of Physics, University of Helsinki, Helsinki, Finland aut Aubinet M. Faculte des Sciences Agronomiques des Gembloux, Gembloux, Belgium aut Kurbanmuradov O. Scientific Technical Center Climate, Ashkhabad, Turkmenistan aut Sabelfeld K. Institute of Computational Mathematics and Mathematical Geophysics, Novosibirsk, Russia aut Markkanen T. Department of Physics, University of Helsinki, Helsinki, Finland aut Vesala T. Department of Physics, University of Helsinki, Helsinki, Finland aut Boundary-Layer Meteorology Kluwer Academic Publishers 97/1(2000-10-01), 137-166 0006-8314 97:1<137 2000 97 10546 https://doi.org/10.1023/A:1002702810929 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1002702810929 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Rannik Ü. Department of Physics, University of Helsinki, Helsinki, Finland aut NATIONALLICENCE 700 1- Aubinet M. Faculte des Sciences Agronomiques des Gembloux, Gembloux, Belgium aut NATIONALLICENCE 700 1- Kurbanmuradov O. Scientific Technical Center Climate, Ashkhabad, Turkmenistan aut NATIONALLICENCE 700 1- Sabelfeld K. Institute of Computational Mathematics and Mathematical Geophysics, Novosibirsk, Russia aut NATIONALLICENCE 700 1- Markkanen T. Department of Physics, University of Helsinki, Helsinki, Finland aut NATIONALLICENCE 700 1- Vesala T. Department of Physics, University of Helsinki, Helsinki, Finland aut NATIONALLICENCE 773 0- Boundary-Layer Meteorology Kluwer Academic Publishers 97/1(2000-10-01), 137-166 0006-8314 97:1<137 2000 97 10546 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer