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<title>Intercomparison of airborne N<formula><inf><roman>2</roman></inf></formula>O measurements using tunable diode laser absorption spectroscopy and in-situ gas chromatography</title>

1999; SPIE; Volume: 3758; Linguagem: Inglês

10.1117/12.366442

1996-756X

Peter Hoor, Horst Fischer, S. Wong, Andreas Engel, T. Wetter,

Spectroscopy and Laser Applications

During the STREAM98 campaign conducted from Timmins (Canada) in July 1998, simultaneous airborne measurements of chemical tracers were performed using a Cessna Citation II twinjet as carrier platform. We present an intercomparison of N 2 O measurements using an in-situ GC (University of Frankfurt/Main, Germany) and a tunable diode laser instrument (TRISTAR) operated by the Max Planck Institute for Chemistry, Mainz, Germany. The duty cycle of the GC is one second measurement per 120 s interval, whereas the sampling rate of the TDLAS is 1 Hz. Both instruments are in situ calibrated using working gas standards traced against primary standards provided by NOAA. The maximum deviation between the two independent measurements of N 2 O is less than two years, which is of the order of the uncertainties of both instruments.