Intercomparison of airborne N2O measurements using tunable diode laser absorption spectroscopy and in-situ gas chromatography

摘要

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.