FEBUKO and MODMEP: Field measurements and modelling of aerosol and cloud multiphase processes

An overview of the two FEBUKO aerosol–cloud interaction field experiments in the Thüringer Wald (Germany) in October 2001 and 2002 and the corresponding modelling project MODMEP is given. Experimentally, a variety of measurement methods were deployed to probe the gas phase, particles and cloud droplets at three sites upwind, downwind and within an orographic cloud with special emphasis on the budgets and interconversions of organic gas and particle phase constituents. Out of a total of 14 sampling periods within 30 cloud events three events (EI, EII and EIII) are selected for detailed analysis. At various occasions an impact of the cloud process on particle chemical composition such as on the organic compounds content, sulphate and nitrate and also on particle size distributions and particle mass is observed. Moreover, direct phase transfer of polar organic compound from the gas phase is found to be very important for the understanding of cloudwater composition. For the modelling side, a main result of the MODMEP project is the development of a cloud model, which combines a complex multiphase chemistry with detailed microphysics. Both components are described in a fine-resolved particle/drop spectrum. New numerical methods are developed for an efficient solution of the entire complex model. A further development of the CAPRAM mechanism has lead to a more detailed description of tropospheric aqueous phase organic chemistry. In parallel, effective tools for the reduction of highly complex reaction schemes are provided. Techniques are provided and tested which allow the description of complex multiphase chemistry and of detailed microphysics in multidimensional chemistry-transport models

Atmosphaerischer Abbau von Kohlenwasserstoffen C_5 - C_7 Abschlussbericht

The project aimed at developing methods of analysis that may contribute information on the decomposition of longer-chain components. Particular interest was taken in the group of hydroperoxides, for which no suitable detection methods have been available until now. Apart from a method of separating peroxides with the aid of liquid chromatography, three methods for hydroperoxide detection were developed in the period under report. (orig.)Das Ziel dieses Vorhabens war es, analytische Verfahren zu entwickeln, die einen Beitrag zur Aufklaerung des Abbaus laengerkettiger Verbindungen liefern koennen. Hierbei war vor allem eine Stoffgruppe, fuer die bisher noch keine geeigneten Detektionsmethoden zur Verfuegung stand, von groesstem Interesse, die Gruppe der Hydroperoxide. Im Berichtszeitraum gelang es, neben einer Methode zur Trennung von Peroxiden mit Fluessigkeitschromatographie, drei Verfahren zur Detektion von Hydroperoxiden zu entwickeln. (orig.)Available from TIB Hannover: D.Dt.F.AC1000(43,36) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEBundesministerium fuer Forschung und Technologie (BMFT), Bonn (Germany)DEGerman

Radiooekologische Untersuchungen im Raum Maehring/Poppenreuth (Opf.)

Copy held by FIZ Karlsruhe; available from UB/TIB Hannover / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Untersuchung des Resuspensionsverhaltens von Plutonium in der Biosphaere

Um das Resuspensionsverhalten von Pu mit dem anderer Elemente zu vergleichen, wurden inaktive Elemente in die Untersuchungen miteinbezogen. Folgende Messungen wurden durchgefuehrt: 1. Bestimmung der Pu-Oberflaechenkontamination des Bodens und der Oberflaechenkonzentration der inaktiven Elemente; 2. Vertikalverteilungen der Elemente in der Atmosphaere; 3. Partikelgroessenverteilung der Elemente; 4. Korrelationen der Elemente; 5. Bestimmung der Resuspensionsparameter. Die Messungen erfolgten ueber einen laengeren Zeitraum, um zeitliche und raeumliche Veraenderungen des Pu sowie der inaktiven Elemente zu erfassen. Bei gleichem Resuspensionsverhalten von Pu und inaktiven Elemente, koennten diese, aufgrund ihrer schnellen Bestimmbarkeit, als Modellelemente fuer Vorhersagen zum Verhalten des Pu dienen. (orig.)In order to compare the resuspension behaviour of Pu with that of other elements, inactive elements were included into the investigations. The following measurements were made: 1. Determination of Pu surface contamination of the ground and of surface concentration of the inactive elements; 2. vertical distributions of the elements in the atmosphere; 3. particle size distributions of the elements; 4. element correlations; 5. determination of resuspension parameters. The measurements were made over a longer period of time in order to detect changes of Pu and of the inactive elements in terms of time and space. With the same resuspension behaviour of Pu and inactive elements, the latter, because of their quick determinability, could serve as model elements to predict Pu behaviour. (orig.)SIGLEAvailable from FIZ Karlsruhe / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Radiooekologische Untersuchungen des Plutoniums in der Biosphaere

SIGLECopy held by FIZ Karlsruhe; available from UB/TIB Hannover / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Messungen von Chlorkohlenwasserstoffen in gasfoermiger, fluessiger und fester Phase sowie an Pflanzenoberflaechen Abschlussbericht

Available from TIB Hannover: F93B473 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Untersuchung des Transportes und der Deposition von Pb-210 Abschlussbericht

TIB Hannover: FR 3346 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman