Ronald Scheirer
Institute of Atmospheric Physics, DLR
02.12.2005, 13.00 c.t.
Room S3120
During two measurement campaigns within the frame of the EC project INSPECTRO a comprehensive set of radiative flux and cloud microphysics has been collected. The aim of this study is to interpret ground-based observations of the actinic flux by simulations of two-dimensional surface actinic flux distributions in the presence of clouds. A statistical cloud retrieval algorithm (CLABAUTAIR) was used for the reconstruction of full 3D cloud distributions from aircraft (and satellite data in one case). Observational data from three selected days were used as input to three-dimensional radiative transfer calculations with the MYSTIC Monte Carlo radiative transfer code. A comparison of the calculated flux with surface observations shows good agreement within the uncertainties of the model and the observations. This is true in particular for a scattered cloud case where the extrema of the simulation generate almost perfect limits for the observation time series.