Göckede, M; Markkanen, T; Hasager, CB; Foken, T: Update of footprint-based approach for the characterisation of complex measurement sites, Boundary-Layer Meteorology, 118, 635-655 (2006), doi:DOI:10.1007/s10546-005-6435-3
Key words: Complex terrain,Eddy-covariance,Footprint modelling,Flux aggregation,Quality assurance,Quality control
Abstract:
Horizontal heterogeneity can significantly affect the flux data quality at monitoring sites with a complex terrain structure. In heterogeneous conditions, the adoption of the eddy-covariance technique is contraindicated by the lack of horizontal homogeneity and presence of advective conditions. In addition, uncertainty concerning the sources or sinks influencing a measurement compromises the data interpretation. The consideration of the spatial context of a measurement, defined by a footprint analysis, can therefore provide an important tool for data quality assessment.
This study presents an update of an existing footprint-based quality evaluation concept for flux measurement sites in complex terrain. The most significant modifications in the present version are the use of a forward Lagrangian stochastic trajectory model for the determination of the spatial context of the measurements, and the determination of effective roughness lengths with a flux aggregation model in a pre-processing step. Detailed terrain data gathered by remote sensing methods is included.
This approach determines spatial structures in the quality of flux data for varying meteorological conditions. These results help to identify terrain influences affecting the quality of flux data, such as dominating obstacles in the fetch, or slopes biasing the wind field, so that the most suitable footprint regions for the collection of high-quality data sets can be identified. Additionally, the approach can be used to evaluate the performance of a coordinate rotation procedure, and to check to what extent the measured fluxes are representative for a target land use type.

There are additional file downloads belonging to this publication

Password
Upcoming ...


BayCEER Colloquium:
Th. 2024-04-18
The Canvas of Change: Creative Marketing for Behaviour Change, Sustainability and Social Good
Th. 2024-04-18
Survival, 'dormancy', and resuscitation of microorganisms in water-limited environments: insights from coastal salt flats and desert soil crusts
BayCEER Short Courses:
Tu. 2024-04-16
Geographical information system and R environment for conservation biology
Ecological-Botanical Garden:
Su. 2024-04-07
Führung | Talking Tree: Was Bäume über´s Klima erzählen
Fr. 2024-04-19
Führung | Gesteine im Ökologisch-Botanischen Garten
Weather research site
Luftdruck (356m): 958.8 hPa
Lufttemperatur: 4.9 °C
Niederschlag: 0.0 mm/24h
Sonnenschein: <1 h/d

...more
Globalstrahlung: 41 W/m²
Lufttemperatur: 2.1 °C
Niederschlag: 0.0 mm/24h
Wind (Höhe 32m): 18.9 km/h

...more
This site makes use of cookies More information