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Update of footprint-based approach for the characterisation of complex measurement sites

Title data

Göckede, Mathias ; Markkanen, Tiina ; Hasager, Charlotte B. ; Foken, Thomas:
Update of footprint-based approach for the characterisation of complex measurement sites.
In: Boundary-Layer Meteorology. Vol. 118 (March 2006) Issue 3 . - pp. 635-655.
ISSN 1573-1472
DOI: https://doi.org/10.1007/s10546-005-6435-3

Abstract in another language

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.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER29794
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Former Professors > Professorship Micrometeorology - Univ.-Prof. Dr. Thomas Foken
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
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 11 Sep 2015 06:33
Last Modified: 11 Sep 2015 06:33
URI: https://eref.uni-bayreuth.de/id/eprint/19154