%0 Poster %@ 0030-3917 %A Behnert, I. %A Matthias, V. %A Doerffer, R. %D 2004 %J AERONET/PHOTONS Workshop 2004 %N 1988 %T Aerosol optical thickness and its spectral dependence derived from sunphotometer measurements over the southern North Sea coastal region %U %X