Articles | Volume 3, issue 2
Atmos. Meas. Tech., 3, 387–395, 2010
https://doi.org/10.5194/amt-3-387-2010
Atmos. Meas. Tech., 3, 387–395, 2010
https://doi.org/10.5194/amt-3-387-2010

  25 Mar 2010

25 Mar 2010

First eddy covariance flux measurements by PTR-TOF

M. Müller2,1, M. Graus1, T. M. Ruuskanen1, R. Schnitzhofer2,1, I. Bamberger1, L. Kaser1, T. Titzmann1, L. Hörtnagl3, G. Wohlfahrt3, T. Karl4,1, and A. Hansel1 M. Müller et al.
  • 1Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Innsbruck, Austria
  • 2Ionicon Analytik, Innsbruck, Austria
  • 3Institut für Ökologie, Universität Innsbruck, Innsbruck, Austria
  • 4Atmospheric Chemistry Division, National Center for Atmospheric Research, Boulder, CO 80307, USA

Abstract. The recently developed PTR-TOF instrument was evaluated to measure methanol fluxes emitted from grass land using the eddy covariance method. The high time resolution of the PTR-TOF allowed storing full mass spectra up to m/z 315 with a frequency of 10 Hz. Three isobaric ions were found at a nominal mass of m/z 33 due to the high mass resolving power of the PTR-TOF. Only one of the three peaks contributed to eddy covariance fluxes. The exact mass of this peak agrees well with the exact mass of protonated methanol (m/z 33.0335). The eddy covariance methanol fluxes measured with PTR-TOF were compared to virtual disjunct eddy covariance methanol fluxes simultaneously measured with a conventional PTR-MS. The methanol fluxes from both instruments show excellent agreement.