1 ENERGY FLUX DENSITIES WITH REMOTE SENSING AND IN-SITU DATA IN AN URBAN ENVIRONMENT

The impacts of climate change and also the modification of the urban climate of the cities itself cannot be neglected and affects also human life. With more and more people living in urban areas, urban climatology becomes more and more important. Remote sensing can help to analyze the spatially distributed radiation and heat fluxes in complex environments like urban areas. During the Basel Urban Boundary Layer Experiment (BUBBLE) in 2002 a wide set of micrometeorological measurements of an international research team took place in the City of Basel in northern Switzerland. The acquired dataset enables us to validate the radiation and energy flux densities which were computed and modelled with remote sensing data from different satellite systems (MODIS, ASTER, NOAA-AVHRR, Landsat ETM+). After validation of the radiation fluxes, the ground heat flux was modelled and validated also with the in-situ measurements. A combined NDVI-Bowen-Ratio regression approach was used to compute the turbulent fluxes in the spatial domain. The results presented in this paper are very promising and encourage us to pursue the further use of remote sensing data for the assessment of radiation and heat flux densities. 1