Aquatic systems play a salient role in the complex processes of energy and matter exchange between the geosphere and the atmosphere. However, in heterogeneous aquatic systems, small scale aspects of a process under observation may not be summed directly to obtain regional estimates because of process nonlinearities with change in scale.

I. Atmosphere — Rock — Water Interactions.- 1. Acquisition of Solutes and Regulation of the Composition of Natural Waters.- 2. Regulation of Drainage Water Composition by Biotic Processes in Terrestrial Ecosystems.- 3. Aquatic Carbonate Systems: Chemical Processes in Natural Waters and Global Cycles.- 4. Modeling of Heterogeneous Chemistry in the Global Troposphere.- II. Metals, Nutrients and Organic Carbon.- 5. Biogeochemistry of Organic Matter in Coastal Ocean Waters.- 6. Microbial Transformation of Metals in Relation to the Biogeochemical Cycle.- 7. Metal Speciation: Concepts, Analysis and Effects.- 8. Light-Induced Processes in the Aquatic Environment.- 9. Trace Metal/Phytoplankton Interactions in the Sea.- 10. Optical Remote Sensing of Marine Ecosystems: Bio-Geochemical Implications of Ocean Colour, Marine Productivity and Atmospheric Interactions.- III. The Solid-Water Interface.- 11. Reactions at the Mineral-Water Interface.- 12. Surface Processes in Water Technology.- IV. Transformation, Degradation and Transport of Pollutants. Spatial and Temporal Scaling.- 13. Sources and Reactivity of Reductants Encountered in Aquatic Environments.- 14. Abiotic Transformation Pathways of Organic Chemicals in Aquatic Ecosystems.- 15. Coupled Processes in Reaction-Flow Transport of Contaminants.- 16. Scale Effects in the Transport of Contaminants in Natural Media.- 17. Modeling the Hydrologic and Biogeochemical Response of a Catchment Area to Anthropogenic Inputs.- 18. Spectral Properties of Soils and the Use of Optical Remote Sensing Systems for Soil Erosion Mapping.

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