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Volume 5, issue 11
Atmos. Meas. Tech., 5, 2763–2777, 2012
https://doi.org/10.5194/amt-5-2763-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.
Atmos. Meas. Tech., 5, 2763–2777, 2012
https://doi.org/10.5194/amt-5-2763-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 16 Nov 2012

Research article | 16 Nov 2012

Comparison of N2O5 mixing ratios during NO3Comp 2007 in SAPHIR

H. Fuchs1,2,*, W. R. Simpson3, R. L. Apodaca3, T. Brauers4, R. C. Cohen5, J. N. Crowley6, H.-P. Dorn4, W. P. Dubé1,2, J. L. Fry5,**, R. Häseler4, Y. Kajii7,***, A. Kiendler-Scharr4, I. Labazan6, J. Matsumoto7,****, T. F. Mentel4, Y. Nakashima7, F. Rohrer4, A. W. Rollins5, G. Schuster6, R. Tillmann4, A. Wahner4, P. J. Wooldridge5, and S. S. Brown1 H. Fuchs et al.
  • 1National Oceanic and Atmospheric Administration, Earth System Research Laboratory, Boulder, CO, USA
  • 2Cooperative Institute for Research in the Environmental Sciences, University of Colorado, Boulder, CO, USA
  • 3Department of Chemistry and Biochemistry and Geophysical Institute, University of Alaska Fairbanks, Fairbanks, AK, USA
  • 4Institute of Energy and Climate Research, IEK-8: Troposphere, Forschungszentrum Jülich GmbH, Jülich, Germany
  • 5Department of Chemistry, University of California Berkeley, Berkeley, CA, USA
  • 6Max-Planck-Institute for Chemistry, Mainz, Germany
  • 7Department of Applied Chemistry, Tokyo Metropolitan University, Tokyo, Japan
  • *now at: Institute of Energy and Climate Research, IEK-8: Troposphere, Forschungszentrum Jülich GmbH, Jülich, Germany
  • **now at: Chemistry Department, Reed College, Portland, OR, USA
  • ***now at: Graduate School of Global Environmental Studies, Kyoto University, Kyoto, Japan
  • ****now at: Faculty of Human Sciences, Waseda University, Saitama, Japan

Abstract. N2O5 detection in the atmosphere has been accomplished using techniques which have been developed during the last decade. Most techniques use a heated inlet to thermally decompose N2O5 to NO3, which can be detected by either cavity based absorption at 662 nm or by laser-induced fluorescence. In summer 2007, a large set of instruments, which were capable of measuring NO3 mixing ratios, were simultaneously deployed in the atmosphere simulation chamber SAPHIR in Jülich, Germany. Some of these instruments measured N2O5 mixing ratios either simultaneously or alternatively. Experiments focused on the investigation of potential interferences from, e.g., water vapour or aerosol and on the investigation of the oxidation of biogenic volatile organic compounds by NO3. The comparison of N2O5 mixing ratios shows an excellent agreement between measurements of instruments applying different techniques (3 cavity ring-down (CRDS) instruments, 2 laser-induced fluorescence (LIF) instruments). Datasets are highly correlated as indicated by the square of the linear correlation coefficients, R2, which values were larger than 0.96 for the entire datasets. N2O5 mixing ratios well agree within the combined accuracy of measurements. Slopes of the linear regression range between 0.87 and 1.26 and intercepts are negligible. The most critical aspect of N2O5 measurements by cavity ring-down instruments is the determination of the inlet and filter transmission efficiency. Measurements here show that the N2O5 inlet transmission efficiency can decrease in the presence of high aerosol loads, and that frequent filter/inlet changing is necessary to quantitatively sample N2O5 in some environments. The analysis of data also demonstrates that a general correction for degrading filter transmission is not applicable for all conditions encountered during this campaign. Besides the effect of a gradual degradation of the inlet transmission efficiency aerosol exposure, no other interference for N2O5 measurements is found.

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