Gatzsche, K; Babel, W; Falge, E; Pyles, RD; Paw U, KT; Raabe, A; Foken, T: Application of the ACASA model for a spruce forest and a nearby patchy clearing, Biogeosciences Discussions (2017), doi:10.5194/bg-2017-450
Abstract:

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.

Aktuelle Termine


BayCEER-Kolloquium:
Do. 12.04.2018
- folgt -
Do. 19.04.2018
A new experiment to unravel the Impact of Biodiversity and Climate Variability on the functioning of grasslands
Do. 26.04.2018
Anticipating biome shifts
Ökologisch-Botanischer Garten:
So. 04.03.2018
Die Lösung? Pflanzliche Alternativen für Plastik
Workshop:
Mi. 28.02.2018
Workshop Einstieg in die Umweltmesstechnik mit Arduino und Raspberry Pi
Wetter Versuchsflächen
Luftdruck (356m): 976.4 hPa
Lufttemperatur: -0.4 °C
Niederschlag: 0.0 mm/24h
Sonnenschein: 2 h/d
Wind (Höhe 17m): 19.7 km/h
Wind (Max.): 34.6 km/h
Windrichtung: O

...mehr
Globalstrahlung: 533 W/m²
Lufttemperatur: -3.3 °C
Niederschlag: 0.0 mm/24h
Sonnenschein: 2 h/d
Wind (Höhe 32m): 18.5 km/h
Wind (Max.): 36.6 km/h

...mehr