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Experimental verification of downwind flux contributions and its integration in an existing flux footprint model

Heidbach, K.; Schmid, H.P.

Abstract (englisch):
In the last decades flux footprint modeling has evolved to an indispensable quality assessment
tool in micrometeorology. In studies which include routine footprint estimates for long-term
or continuous flux observations, analytical models are the most commonly used class of
footprint models, due to their mathematical simplicity, and hence their low computational
expense. This practical advantage outweighs the two main drawbacks of such models: their
common assumption of homogeneous turbulence, which is not usually fulfilled in practical
flux measurement conditions, and the non-consideration of flux contributions from sources
downwind of the measurement system.
To demonstrate that downwind flux contributions are present and measurable, we conducted
tracer experiments at a grassland site in Graswang, southern Germany. The site is part of the preAlpine observatory and is located on a flat alluvial valley bottom (ca. 1 km
wide), flanked by steep sides. An artificial tracer (methane) was released continuously over
one averaging period from a surface source of 1m2 size located downstream of an eddy
covariance measu ... mehr

Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Umweltforschung (IMK-IFU)
Publikationstyp Poster
Jahr 2016
Sprache Englisch
Identifikator URN: urn:nbn:de:swb:90-635707
KITopen ID: 1000063570
HGF-Programm 12.02.06; LK 01
Erschienen in 2nd ICOS Science Conference on Greenhouse Gases and Biogeochemical Cycles, Helsinki, SF, September 27-29, 2016
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