Articles | Volume 11, issue 10
https://doi.org/10.5194/amt-11-5421-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-11-5421-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
02 Oct 2018
Research article |
| 02 Oct 2018
| 02 Oct 2018
Uncertainty of eddy covariance flux measurements over an urban area based on two towers
Institute for Atmospheric and Earth System Research (INAR)/Physics, Faculty of Science, University of Helsinki, P.O. Box 68, 00014 Helsinki, Finland
Helsinki Institute of Sustainability Science, Faculty of Science, University of Helsinki, P.O. Box 68, 00014 Helsinki, Finland
Üllar Rannik
Institute for Atmospheric and Earth System Research (INAR)/Physics, Faculty of Science, University of Helsinki, P.O. Box 68, 00014 Helsinki, Finland
Tom V. Kokkonen
Institute for Atmospheric and Earth System Research (INAR)/Physics, Faculty of Science, University of Helsinki, P.O. Box 68, 00014 Helsinki, Finland
Mona Kurppa
Institute for Atmospheric and Earth System Research (INAR)/Physics, Faculty of Science, University of Helsinki, P.O. Box 68, 00014 Helsinki, Finland
Ari Karppinen
Finnish Meteorological Institute, P.O. Box 503, 00101 Helsinki, Finland
Rostislav D. Kouznetsov
Finnish Meteorological Institute, P.O. Box 503, 00101 Helsinki, Finland
A. M. Obukhov Institute of Atmospheric Physics, 119017 Moscow, Russia
Pekka Rantala
Institute for Atmospheric and Earth System Research (INAR)/Physics, Faculty of Science, University of Helsinki, P.O. Box 68, 00014 Helsinki, Finland
Timo Vesala
Institute for Atmospheric and Earth System Research (INAR)/Physics, Faculty of Science, University of Helsinki, P.O. Box 68, 00014 Helsinki, Finland
INAR/Forest Sciences, Faculty of Agriculture and Forestry, P.O. Box 27, 00014 University of Helsinki, Finland
Curtis R. Wood
Finnish Meteorological Institute, P.O. Box 503, 00101 Helsinki, Finland
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Latest update: 07 Oct 2025
Short summary
Identical EC systems on two sides of a building in central Helsinki were used to assess the uncertainty of the vertical fluxes on the single measurement point from July 2013 to September 2015. Sampling at only one point yielded up to 12% underestimation in the cumulative carbon fluxes; for sensible and latent heat the respective values were up to 5 and 8%. The commonly used statistics, kurtosis and skewness, are not necessarily suitable for filtering out data in a densely built urban area.
Identical EC systems on two sides of a building in central Helsinki were used to assess the...
