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This book presents in an integrated approach results from five years of interdisciplinary research in the project Zirkulation und SchadstojJumsatz in der Nordsee (ZlSCH) (Circulation and Contaminant Fluxes in the North Sea). From 1984 to 1989 over 30 scientists and technicians worked in the project, which was supported by the Bundesminister fUr Forschung und Technologie (German Minister for Research and Technology). Together with the UniversiHit Hamburg, which initiated ZISCH, the following institutions participated: Technische Universitat Hamburg-Harburg, Rheinisch-Westfalische Technische Hochschule Aachen, Deutsches Hydrographisches Institut (now Bundesamt fUr Seeschiffahrt und Hydrographie), GKSS Forschungszentrum Geesthacht, Alfred-Wegener Institut Bremerhaven, Biologische Anstalt Helgoland, Universitat Paderborn. More than other national and international projects, the ZISCH project aimed at a holistic view of the marine ecosystem. For this reason, the different disciplines working together were not limited to purely marine sciences (oceanography, marine biology and chemistry), but atmospheric sciences (meteorology, atmospheric chemistry) and food chemistry also participated. Previous to ZISCH, no North Sea wide investigation of comparable complexity had ever been carried out. The area under investigation is shown in Fig. 1. 1. The ZISCH research project was established in view of the obvious threat to the North Sea environment generated by human activities. The primary causes are considered to be industrial, agricultural and municipal discharges which reach the sea over different pathways. Table 1. 1 summarizes the sources and amounts of various contaminants entering the North Sea.
