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European Geosciences Union, Atmospheric Measurement Techniques, 2(3), p. 387-395, 2010

DOI: 10.5194/amt-3-387-2010

European Geosciences Union, Atmospheric Measurement Techniques Discussions, 6(2), p. 3265-3290

DOI: 10.5194/amtd-2-3265-2009

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First eddy covariance flux measurements by PTR-TOF

Journal article published in 2009 by M. Müller, M. Graus, Tm M. Ruuskanen, R. Schnitzhofer, I. Bamberger, L. Kaser, T. Titzmann, L. Hörtnagl ORCID, G. Wohlfahrt ORCID, T. Karl ORCID, A. Hansel
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

The recently developed PTR-TOF instrument was evaluated to measure methanol fluxes using the eddy covariance method. The PTR-TOF was employed at a well characterized temperate meadow field site in the Stubai valley, Austria, to measure VOC fluxes above an intensively farmed grass land. The high time resolution of the PTR-TOF allowed storing full mass spectra up to m/z 315 with a frequency of 10 Hz. Due to the high mass resolving power of the PTR-TOF three isobaric peaks were found at a nominal mass of m/z 33. 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.