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An optimized chemiluminescence detector for tropospheric NO measurements
Authors:John W Drummond  Andreas Volz  Dieter H Ehhalt
Institution:(1) Institut für Chemie 3: Atmosphärische Chemie, Kernforschungsanlage Jülich GmbH, D-5170 Jülich, F.R. Germany
Abstract:A detector for the chemiluminescent measurement of NO in background air is described. A large reduction of interferences is achieved by using a stabilized ozone generator which allows operation of the instrument at lower O3 concentrations. Purification and humidification of the O3 stream further reduces interferences and shortens the instrumental clean-up time, which is important for aircraft missions. From a series of laboratory tests and from measurements performed aboard an aircraft it is demonstrated that the remaining interferences are acceptable for measurements in the undisturbed troposphere. In particular, no remnant NO signal is observed in clean air at night. During flight, a detection limit (2sgr) of 20 ppt is achieved for a 1 min integration time.
Keywords:Optimized chemiluminescence  detector  tropospheric  NO  NO x   measurements  interferences  vertical profile  ozone generator
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