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Peroxy Radical Group at the Institute of Environmental Physics
University of Bremen

Contents:

Members

Current projects

Relevant publications

Recent poster presentations

Recent highlights

Current members of the Peroxy Radical Group

Recent highlights:

Current Projects:

Funded by the Ministery of Environment in Bremen (1996-1999)

Main scientific objectives:

• Development of a short-term O₃ prediction system
• Explanation of empirical O₃ dependence on T
• Role of HO₂ and RO₂ in the O₃ formation during smog episodes

Summer measurements in periods of elevated concentrations of O₃:
RO_x, NO, NO₂, O₃, PAN, UV-A, UV-B, wd, ws, T, P

Funded by the Ministery of Environment in Bremen (1997-98)

• Cooperation with the industry for the improvement and marketing of a chemiluminiscence NO₂-detector

ISITEC Ingenieurbüro; TTZ: Technologietransferzentrum Bremerhaven

Funded by the EC (1995-98)

• Characterization and comparison of existing measurement and calibration methods for peroxy radicals

• Intercomparison under controlled conditions in the laboratory
• Sensitivity tests to different RO₂
• Characterization of the calibration sources (lab and modelling)

KFA Jülich, MPI Mainz, UEA Norwich, CNRS Orleans, JRC Ispra, York University

IUP contribution funded by DFG (Deutsche Forschungsgemeinschaft) (1996)

Scientific objective:

• Determination of RO_x concentrations in remote maritime regions

• Measurement campaign on board the Polarstern vassel (ANT XIV: October-November 1996)
• Interpretation of results

AWI, BUGH, DWD, FU, GKSS, UEJFG, IfMK, IFU, ISAS, KFA, UM, UU, ZUF, CFR_CNRS, UC

Funded by the CE (1988-2000)

• Evaluation and improvement of instrumentation for ground-base or airborne measurements of HO₂ and RO₂ radicals in the troposhere:

• Laboratory studies:
  • Development of T and P controlled inlet systems and NO₂ detectors
  • Modification and developing of new calibration sources. Determination of their potential for airborne use
  
  
• Field measurement studies:
  • Measurement campaign at Silwood Park
  • Interpretation of results. Evaluation of sources and sinks of RO_x
  
  
• Modelling studies

Partners:

ICCET London, UL Leeds, CNRS Orleans, JRC Ispra, KFA Jülich

Relevant publications

1. Hastie, D.R., Weißenmayer, M., Burrows, J.P. and Harris, G.W.
   "Calibrated chemical amplifier for atmospheric RO_x measurements".
   Analytical Chemistry, 63, 2048-2057 (1991).
2. Behmann, T., Weißenmayer, M. and J.P. Burrows
   "Peroxy radicals in the night-time oxidation chemistry".
   Proceedings of the 6th European Symposium on the physicochemical behaviour of atmospheric pollutants, pp 259-264, Varese (1993).
3. Weißenmayer, M., Burrows, J.P. and Schupp, M.
   "Peroxy radical measurement in the boundary layer above the Atlantic Ocean".
   Proceedings of the 7th European Symposium on the physicochemical behaviour of atmospheric pollutants, pp 575-581, Varese (1993).
4. Weißenmayer, M.
   "Peroxyradikalmessungen in der bodennahen Grenzschicht über dem Atlantik".
   PhD. Thesis, University of Mainz, Germany (1994).
5. Weißenmayer, M., Andrés Hernández, M.D., Behmann, T., Burkert, J., Schwöppe, D., Stöbener, D., and J.P. Burrows
   "Der Einfluß der Peroxyradikalkonzentration auf die Höhe der Ozonproduktion".
   Abschlußbericht zum Vorhaben FV058 des Bremer Senators für Umweltschutz und Stadtentwicklung in Bremen (1995).
6. Burkert, J., Andrés Hernández, M.D., Schwöppe, D., Stöbener, D., Weißenmayer, M., and J.P. Burrows
   "Ozone production calculated by using peroxy radical measurements".
   Proceedings of EUROTRAC Symposium 96, pp 627-631 (1996).
7. Andrés Hernández, M.D., Burkert, J., Stöbener, D., and J.P. Burrows
   "Role of peroxy radicals in tropospheric ozone formation".
   Proceedings of the 7th European Symposium on the physicochemical behaviour of atmospheric pollutants, pp 149-152, Venice (1996).
8. Schwöppe, D. and J.P.Burrows
   "Comparison of NO₂ photolysis frequencies and UV-A measurements".
   Proceedings of the 7th European Symposium on the physicochemical behaviour of atmospheric pollutants, pp 360-364, Venice (1996).
9. Burkert, J., Behmann, T., Andrés Hernández, M.D., Weißenmayer, M., Perner, D. and J.P. Burrows
   "Measurements of Peroxyradicals in a forested area in Portugal".
   (submitted to Chemosphere, 1998).
10. Zenker, T., Fischer, H., Nikitas, C., Parchatka, U., Harris, G.W., Mihelcic, D., Muesgen, P., Paetz, H.W., Schultz, M., Volz-Thomas, A., Schmitt, R., Behmann, T., Weissenmayer, M. and J.P. Burrows
    "Intercomparison of NO, NO₂, NO_y, O₃ and RO_x measurements du ring the OCTA campaign 1993 at Izaña".;
    (in publication Journal of Geophys. Res.)
11. Poisson, N., Kanakidou, M., Bonsang, B., Behmann, T., Burrows, J., Gölz, C., Harder, H., Lewis, A., Moortgart, G.K., Nunes, T., Pio, C., Platt, U., Sauer, F., Schuster, G., Scakins, P., Senzig, J., Seuwen, R., Trapp, D., Voltz-Thomas, A., Zenker, T., Zitzelberger, R.
    "The impact of natural nonmethane hydrocarbon oxidation on the free radical and ozone budgets above a eucalyptus forest".
    (submitted to Chemosphere, 1998)
12. Stöbener, D., Andrés Hernández, M.D., Reichert, L., Burkert, J., and J.P. Burrows
    "Improvement of a H₂O calibration source for peroxy radical measurements by using the chemical amplification technique".
    Proceedings of the AGU 1997 Fall meeting published as a supplement to EOS, Transaction, AGU Vol 78, Number 46 (1997)
13. Andrés Hernández, M.D., Burkert, J., Gerhard, M., Stöbener, D., Reichert, L., and J.P. Burrows
    " Role of peroxy radicals in the troposferic ozone formation at different sites".
    Proceedings of the AGU 1997 Fall meeting published as a supplement to EOS, Transaction, AGU Vol 78, Number 46 (1997)
14. Stöbener, D.
    "Weiterentwicklung einer Peroxyradikalquelle für die Kalibration von RO₂-Messungen in Außenluft".
    Diplomarbeit at the University of Bremen (1999)

Diplomarbeiten:

Dirk Stöbener: "Weiterentwicklung einer Peroxyradikalquelle für die Kalibration von RO₂-Messungen in Außenluft"

Posters:

AGU Fall Meeting in San Francisco 1997:

Improvement of a H₂O calibration source for peroxy radical measurements using the chemical amplification technique

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