Experimental determination of turbulent fluxes over the heterogeneous LITFASS area: Selected results from the LITFASS-98 experiment |
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| Authors: | F Beyrich S H Richter U Weisensee W Kohsiek H Lohse H A R de Bruin Th Foken M Göckede F Berger R Vogt E Batchvarova |
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| Institution: | (1) Meteorological Observatory Lindenberg, German Meteorological Service (DWD), Lindenberg, Germany, DE;(2) Royal Netherlands Meteorological Institute (KNMI), De Bilt, The Netherlands, NL;(3) GKSS Research Center, Geesthacht, Germany, DE;(4) Meteorology and Air Quality Department, Wageningen University, Wageningen, The Netherlands, NL;(5) Dept. of Micrometeorology, University of Bayreuth, Bayreuth, Germany, DE;(6) Institute for Hydrology and Meteorology, Technical University Dresden, Tharandt, Germany, DE;(7) MCR Lab, University of Basel, Basel, Switzerland, CH;(8) National Institute for Meteorology and Hydrology, Sofia, Bulgaria, BG |
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| Abstract: | Summary ?During the LITFASS-98 experiment, local flux measurements were performed over five different types of underlying surface
(grass, barley, triticale, pine forest, water) in a heterogeneous landscape using eddy covariance and profile techniques over
a three week time period in June, 1998. Estimates of the area-integrated sensible heat flux during daytime were obtained from
continuous measurements with a large aperture scintillometer (LAS) along a 4.7 km path. The calculation of a mean diurnal
cycle of the fluxes during the experiment revealed significant differences between the main land use classes. A land-use weighted
average of the sensible heat flux was found to be in good agreement with the LAS based estimate, which in turn was supported
by other regionally integrated flux estimates from budget considerations and aircraft measurements for a few case studies.
The profiles of turbulent quantities measured along a 99 m-tower significantly deviate from “idealised” profiles measured
over homogeneous terrain. Peculiarities in the profile structure could be attributed to the heterogeneity of the terrain,
namely to the differences in the surface characteristics of the footprint areas for the different tower levels.
Received June 6, 2001; revised January 15, 2002; accepted April 4, 2002 |
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