Table A4a. FAAM BAE146-301 Aircraft Instrumentation for Gas-Phase Measurements Species/Parameter Reference Technique Averaging Time Accuracy Precision Detection Limit NO Brough et al. [2003] NO/O3 chemiluminescence 1 s 10 s 12% 40 ppt NO2 Brough et al. [2003] photolysis-chemiluminescence 1 s 10 s 35% 350 ppt NOy Brough et al. [2003] Au converter-chemiluminescence 1 s 10 s 21% 70 ppt O3 UV absorption 3 s 5% 1 ppbv 2 ppbv CO Gerbig et al. [1999] VUV resonance fluorescence 1 s 1 ppbv 2 ppbv H2O ... Lyman alpha absorption and dew point 1 s +\-1degree ... ... NMHCs (C2-C8), DMS, acetone Schauffler et al. [1999] grab sample/GC 60 s 5-10% 1-3% 10-1 pptv Halocarbons (C1-C2) Schauffler et al. [1999] grab sample/GC 60 s 5-10% 1-5% 0.1 ppt Alkylnitrates (C1-C5) Schauffler et al. [1999] grab sample/GC 60 s 5-20% 1-5% 0.005 ppt VOCs ... proton transfer reaction mass spectrometer 1-2 s 10-50% 10% 20-80 ppt PAN Roberts et al. [2004] dual GC/ECD ap90 s 10% 3% 10 pptv HCHO Cardenas et al. [2000] Hantzsch fluorometric 10 s 30% 12% 50 pptv Peroxides (inorganic and organic) Penkett et al. [1995] fluorometric 10 s 5 pptv Peroxy radicals (RO2 + HO2) Green et al. [2006] and Monks et al. [1998] chemical amplifier 30-60 s +\-40% 6% 2 pptv