Improvement of CO2 eddy fluxes modelling in topographically complex terrain

0376921 - ÚVGZ 2013 RIV CZ eng K - Konferenční příspěvek (tuzemská konf.)
Šigut, Ladislav
Improvement of CO2 eddy fluxes modelling in topographically complex terrain.
Sborník studentské vědecké konference 2012. Ostrava: Přírodovědecká fakulta Ostravské univerzity v Ostravě, 2012, ---. ISBN 978-80-7368-966-7.
[Studentská vědecká konference 2012. Ostrava (CZ), 10.05.2012]
Grant CEP: GA MŠMT(CZ) EE2.4.31.0056
Výzkumný záměr: CEZ:AV0Z60870520
Klíčová slova: eddy covariance * u* threshold * gap-filling * flux partitioning * complex terrain
Kód oboru RIV: BO - Biofyzika

Annual sums of net ecosystem exchange (NEE) estimated by eddy covariance method (EC) are often used for comparisons among sites. But application of EC in topographically complex terrain restrains application of standard methods for their estimation. Analysis of friction air velocity response of night-time CO2 fluxes and estimation of mean daily ecosystem respiration from daytime NEE showed that night-time data and fluxes measured early after sunrise or late before sunset are not sufficiently reliable for computation of accurate annual sums of NEE. Therefore presented method takes into account auxiliary soil chamber measurements and applies correction factor in ecosystem respiration model calibrated to biomass inventory results. Also automated algorithm for computation of light response curve parameters in constrained range was established. This method produced accurate annual sums of NEE that were only 7.2% ± 5.2 higher than values determined by biomass inventory method.
Trvalý link: http://hdl.handle.net/11104/0209208