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INTRODUCTION The FEBUKO research cluster intends to improve the understanding of the atmosphere following the AFO2000 program part A under "multiphase processes in the troposphere". Within this project tropospheric multiphase mechanisms are to be examined, verified and further developed by means of ground-based cloud experiments. To this end, the project is fully synchronized with the partner cluster "Modeling of Tropospheric Multiphase Processes: Tools and Chemical Mechanisms (MODMEP)" which is coordinated by the IfT Leipzig. Within FEBUKO, the main focus of the works is the evaluation of present knowledge and the results of further development of tropospheric cloud chemistry models, which may also serve as the basis for mechanism development for the tropospheric aqueous aerosol. FEBUKO will address the following objectives:
Go to top of page The air masses characterized at the DWD/UBA station Schmücke is composed from aged air masses which have been anthropogenically influenced first and then were exposed to biogenic emissions on their way southeast from the Rhein-Main area to the Thuringian Wood (Thüringer Wald). The DWD/UBA research station at the Schmücke mountain is found to be within an orographic cloud for 170 days in a year and should therefore be well suited for a cloud experiment. The air flow to the research station will be assessed by both modeling and tracer experiments. For the experiments, within the main wind direction two measurement points in front and behind the respective mountain will be performed. At the mountain station one platform will be equipped for the characterization of cloud water, interstitial aerosol, CCN and the gas phase. The results obtained will be exchanged between all groups involved and will be discussed in workshops. It is suggested that these workshops will be held together with the members of the MODMEP project cluster to put forward and direct the further development and later reduction of tropospheric chemical multiphase mechanisms along the field studies. WORKING GROUPS IfT-1 Institut für Troposphärenforschung Leipzig PI (Principal Investigator): Hartmut Herrmann IfT-2 Institut für Troposphärenforschung Leipzig PI: Stephan Mertes BTU Brandenburgische Technische Universität Cottbus ZUF Zentrum für Umweltforschung / Universität Frankfurt/a.M. TUD Technische Universität Darmstadt PI: Knut Bächmann WORK PACKAGES WP1 WP2 (IfT-1, BTU, TUD, DWD/UBA at the Schmücke station) 2. Chemical gas phase characterization at the mountain station (Schmücke) 3. Data processing and interpretation WP3 2. Chemical characterization of aerosol after impactor sampling at the valley stations 3. Chemical characterization of interstitial aerosol and droplet residues 4. Data processing and interpretation WP4 2. Physical characterization of the interstitial aerosols and cloud droplet residues 3. Physical characterization of clouds 4. Data processing and interpretation WP5 2. Chemical characterization of cloud water 3. Data processing and interpretation WP6 WP7 2. Measurement of meteorological parameters 3. Flow profile (Schmücke) WP8 2. Aerosol data 3. Cloud water data 4. Coupling to the lines of the development of the MODMEP mechanisms and feedback 5. Interpretation of the measurement results together with MODMEP |
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Figure 1: connection of the FEBUKO working packages Go to top of page IMPORTANCE FOR THE ADVANCEMENT OF KNOWLEDGE The results expected from the research cluster suggested here will serve as a data-base for a comparison of current knowledge on the budget of organics in multiphase environments in central Germany and for a comparison of our model-based under-standing of conversion processes of organic compounds in the multiphase system consisting of gas phase, particle phase and cloud droplets. Based on this, together with the cluster "Modelling of Tropospheric Multiphase Processes: Tools and Chemical Mechanisms (MODMEP)" tropospheric multiphase models will be further developed and, in turn, the possibilities and limitations of the developed mechanisms can then again be assessed through the sequence of FEBUKO campaigns. The expected result of the research will be a significantly better understanding of the role of higher organic compounds within the tropospheric multiphase system. Descriptions of his multiphase system which have been iteratively developed between laboratory studies, field measurements and modelling will then form the basis of modules to be implemented into higher scale models. Ground-based cloud experiments have, according to current knowledge, not been performed with the key focus on budgets and conversions of organics in aerosols and clouds coupled to the gas phase. Because current development of complex tropospheric models aims on stronger focussing on the role of organic compounds, the FEBUKO experiments will continuously accompany the develop of mechanism as performed within MODMEP, so that resulting mechanism can directly be investigated in view of their performance in the field. The expected research results will be the basis of further studies in the areas of field measurements, laboratory studies and modelling for a deeper understanding of the troposphere as a multiphase system. The application of the modules derived from the FEBUKO and MODMEP results will have strong consequences for applications environmental politics such as the quantification of the effects of air pollution in different regions and for understanding mechanisms of global atmospheric chemistry including global change. PRINCIPAL INVESTIGATOR PROJECT DURATION ACKNOWLEDGEMENT
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