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Footprint-weighted tile approach for a spruce forest and a nearby patchy clearing using the ACASA model

Title data

Gatzsche, Kathrin ; Babel, Wolfgang ; Falge, Eva ; Pyles, Rex David ; Paw U, Kyaw Tha ; Raabe, Armin ; Foken, Thomas:
Footprint-weighted tile approach for a spruce forest and a nearby patchy clearing using the ACASA model.
In: Biogeosciences. Vol. 15 (2018) Issue 9 . - pp. 2945-2960.
ISSN 1726-4189
DOI: https://doi.org/10.5194/bg-15-2945-2018

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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 vali- dated for homogeneous spruce forests. The aim of this paper is to test the model using a footprint-weighted tile approach for a clearing with a heterogeneous structure of the under- lying 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 ap- proach 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 by forcing the energy balance closure of the test data either by maintaining the measured Bowen ratio or by the attribution of the residual depending on the fractions of sensible and latent heat flux to the buoyancy flux. The comparison with the model, in which 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 the two methods, but the amount of available data was too small to make a conclusion. With an assumption of similarity between water and carbon dioxide fluxes, no correction of the net ecosystem exchange is neces- sary for Bowen ratios > 1.5.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER146270
Keywords: spruce forest; ACASA model
Institutions of the University: 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 > 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 > 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: 09 Mar 2019 22:00
Last Modified: 13 Jun 2019 13:02
URI: https://eref.uni-bayreuth.de/id/eprint/47907