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Application of the ACASA model for a spruce forest and a nearby patchy clearing

Title data

Gatzsche, Kathrin ; Babel, Wolfgang ; Falge, Eva ; Pyles, R. David ; Paw U, Kyaw Tha ; Raabe, Armin ; Foken, Thomas:
Application of the ACASA model for a spruce forest and a nearby patchy clearing.
In: Biogeosciences Discussions. (November 2017) . - online publ..
ISSN 1810-6285
DOI: https://doi.org/10.5194/bg-2017-450

Official URL: Volltext

Abstract in another language

The ACASA (Advanced Canopy-Atmosphere-Soil Algorithm) model, with a higher order closure for tall vegetation, has already been successfully tested and validated for spruce forests. The aim of this paper is the further application for a clearing with a heterogeneous structure of the underlying surface. The comparison with flux data shows a good agreement with a footprint aggregated tile approach of the model. However, the results of a comparison with a tile approach on the basis of the mean land use classification of the clearing is not significantly different. It is assumed that the footprint model is not accurate enough to separate small scale heterogeneities. All measured fluxes are corrected for energy balance closure with a Bowen ratio and a buoyancy flux correction method. The comparison with the model – where the energy balance is closed – shows that the buoyancy correction for Bowen ratios > 1.5 better fits the measured data. For lower Bowen ratios, the correction probably lies between both methods, but the amount of available data was too small to make a conclusion. With an assumption of a similarity between water and carbon dioxide fluxes, no correction of the net ecosystem exchange is necessary for Bowen ratios > 1.5.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER143347
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professorship Micrometeorology
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Former Professors > Professorship Micrometeorology - Univ.-Prof. Dr. Thomas Foken
Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Former Professors
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 08 Jan 2018 08:56
Last Modified: 08 Jan 2018 09:00
URI: https://eref.uni-bayreuth.de/id/eprint/41187