FEBUKO project description


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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:

  1. put forward the specification of the organic fraction of the tropospheric aerosol beyond the present knowledge,
  2. put forward the specification of organic compounds in cloudwater significantly,
  3. to quantify the possibility of the transfer of watersoluble organic substances by dissolution from cloud condensation nuclei against transfer from the gas phase,
  4. to grasp more completely the role of organic compounds with regards to chemical conversions in the aqueous aerosol and in cloud droplets in models,
  5. to enforce process-oriented, focused fieldexperiments, by means of which the role of chemical conversions, particularly of organic compounds in aqueous particles, can be better characterized,
  6. to this end, in a series of fieldexperiments to follow a completely characterized air-mass through its passage through an orographic cloud, to characterize the cloud in all its phases, and, to characterize the air parcel again after cloud passage. To reach this, gases as well as aerosol- and cloudparticles are characterized at three places chemically and physically.
  7. to characterize models which have been systematically improved coupled to field experiments (following a-f) and to identify weaknesses of current models together with the MODMEP cluster,
  8. to extract from models treated according to (g) compact modules for the application in more complex tropospheric models up to the CTM (chemistry transport) model level based on the FEBUKO campaigns and the MODMEP model development results.

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The FEBUKO project cluster will perform cloud experiments within the project duration (01/2001 - 12/2003) at the DWD/UBA mountain station Schmücke (Thuringian Forest, near Zella-Mehlis). During the years 2001 and 2002 in each year a field campaign of six weeks duration is planned. The strategy of experiments at both stations will be oriented at strategies of former ground-based cloud experiments such as the FELDEX campaigns.

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.

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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

PI: Wolfgang Wieprecht

ZUF Zentrum für Umweltforschung / Universität Frankfurt/a.M.

PI: Wolfgang Jaeschke

TUD Technische Universität Darmstadt

PI: Knut Bächmann

(Work package lead groups underlined)

Project coordination (IfT)

Chemical characterization of the gas phase

(IfT-1, BTU, TUD, DWD/UBA at the Schmücke station)

1. Chemical gas phase characterization at the valley stations (Goldlauter, Gehlberg)

2. Chemical gas phase characterization at the mountain station (Schmücke)

3. Data processing and interpretation

Chemical characterization of aerosol (IfT-1, IfT-2, BTU, TUD)

1. Chemical characterization of aerosols with HV-filters at the valley stations

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

Physical characterization of aerosols and clouds (IfT-1, IfT-2, BTU, ZUF)

1. Physical characterization of the aerosols at the valley stations

2. Physical characterization of the interstitial aerosols and cloud droplet residues

3. Physical characterization of clouds

4. Data processing and interpretation

Characterization of cloud water (IfT-1, BTU, TUD, ZUF)

1. Cloud water sampling

2. Chemical characterization of cloud water

3. Data processing and interpretation

Quality assurance (IfT-1, IfT-2, BTU, ZUF, TUD)

1. Quality assurance of the gas phase measurements, aerosol and cloud water sampling
and chemical analytics

Characterization of air mass transport (ZUF, IfT-1, IfT-2, BTU, TUD)

1. Backward trajectories

2. Measurement of meteorological parameters

3. Flow profile (Schmücke)

Coupling to the research cluster MODMEP (IfT-1, IfT-2, BTU, ZUF, TUD)

1. Gas phase data

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

The connection and interaction of the FEBUKO working packages are schematically shown in Fig.1.

Figure 1: connection of the FEBUKO working packages

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The FEBUKO-project deals with a series of coordinated complex field experiments and their interpretation. Activities such as proposed here have, up to now not been performed with the main objective to better understand budgets and interconversion processes of organics in the tropospheric multiphase system. This research demands a multitude of physical and chemical measurement techniques at the highest technolo-gical level, which are available at various German research institutions. However, the overall task is to heavy for one single research institution albeit specialized. Therefore, campaign-oriented research such as in FEBUKO in the past has also been performed under the participation of various different contributors.

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.

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Hartmut Herrmann
Institut für Troposphärenforschung, Leipzig


01.01.2001 - 30.06.2004


This research is supported by the BMBF (AFO 2000 atmospheric research program, project 07ATF01).



Pressemitteilung zum Verbundprojekt FEBUKO

(2 pages,
115 KB)

Veröffentlichung im AFO Newsletter, 6, MAR 2004
(8 pages,
437 KB )

(2 pages A3,
6.050 KB)

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Last change: 04/05/2004