guest ::
| Home > Conference materials > Papers > Improvement of CO2 eddy fluxes modelling in topographically complex terrain |
Original title:
Improvement of CO2 eddy fluxes modelling in topographically complex terrain
Authors: Šigut, Ladislav
Document type: Papers
Conference/Event: Studentská vědecká konference 2012, Ostrava (CZ), 2012-05-10
Year: 2012
Language: eng
Abstract: 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.
Keywords: complex terrain; eddy covariance; flux partitioning; gap-filling; u* threshold
Project no.: CEZ:AV0Z60870520 (CEP), EE2.4.31.0056
Funding provider: GA MŠk
Host item entry: Sborník studentské vědecké konference 2012, ISBN 978-80-7368-966-7
Institution: Global Change Research Institute AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0209208
Permalink: http://www.nusl.cz/ntk/nusl-112733
The record appears in these collections:
Research > Institutes ASCR > Global Change Research Institute
Conference materials > Papers
Authors: Šigut, Ladislav
Document type: Papers
Conference/Event: Studentská vědecká konference 2012, Ostrava (CZ), 2012-05-10
Year: 2012
Language: eng
Abstract: 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.
Keywords: complex terrain; eddy covariance; flux partitioning; gap-filling; u* threshold
Project no.: CEZ:AV0Z60870520 (CEP), EE2.4.31.0056
Funding provider: GA MŠk
Host item entry: Sborník studentské vědecké konference 2012, ISBN 978-80-7368-966-7
Institution: Global Change Research Institute AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0209208
Permalink: http://www.nusl.cz/ntk/nusl-112733
The record appears in these collections:
Research > Institutes ASCR > Global Change Research Institute
Conference materials > Papers
Record created 2012-05-23, last modified 2024-01-26