Table A1a. NOAA WP-3D Aircraft Instrumentation for Gas-Phase Measurements

Species/Parameter	Reference	Technique	Averaging Time	Accuracy	Precision	Detection Limit
NO	Ryerson et al. [1999]	NO/O3 chemiluminescence	1 s	5%	10 pptv	20 pptv
NO2	Ryerson et al. [1999]	photolysis-chemiluminescence	1 s	8%	25 pptv	100 pptv
NOy	Ryerson et al. [1999]	Au converter-chemiluminescence	1 s	10%	20 pptv	50 pptv
O3	Ryerson et al. [1998]	NO/O3 chemiluminescence	1 s	3%	0.1 ppbv	0.2 ppbv 
CO	Holloway et al. [2000]	VUV resonance fluorescence	1 s	2.5%	0.5 ppbv	1 ppbv
H2O		Lyman alpha absorption	1 s	...	...	...
H2O		thermoelectric hygrometer	3 s	+\-0.2degree-1.0degreeC	+\-0.2degree-1.0degreeC	-75degree to +50degreeC
NMHCs (C2-C10)	Schauffler et al. [1999]	grab sample/GC	8-30 sa	5-10%	1-3%	3 pptv
Halocarbons (C1-C2)	Schauffler et al. [1999]	grab sample/GC	8-30 sa	2-20%	1-10%	0.02-50 pptv
Alkylnitrates (C1-C5)	Schauffler et al. [1999]	grab sample/GC	8-30 sa	10-20%	1-10%	0.02 pptv
VOCs	de Gouw et al. [2003]	proton transfer reaction mass spectrometer (PTRMS)	1 s every 15 s	10-20%	5-30%	50-250 pptv
Formaldehyde	Jimenez et al. [2005]	tunable infrared diode laser absorption spectroscopy (TIDLAS)	1 s	7%	300 pptv	140 pptv
Formic acid	Jimenez et al. [2005]	TIDLAS	1 s	33%	400 pptv	180 pptv
PAN, PPN, PiBN, APAN MPAN	Slusher et al. [2004]	chemical ionization mass spectrometer (CIMS)	2 s, 2 s	15%, 30%	2%, 2%	1 pptv, 5 pptv
NO3, N2O5	Dubé et al. [2006]	cavity ring-down spectroscopy (CARDS)	1 s	25%	2%	1 pptv
HNO3, NH3	Neuman et al. [2002]	CIMS	1 s	15%	25 pptv	50 pptv
Hydroxyl radical 	Eisele and Tanner [1993]	CIMS	30 s	35%	1 x 106 cm-3	5 x 105 cm-3
SO2	Ryerson et al. [1998]	pulsed UV fluorescence	3 s	10%	0.35 ppbv	1 ppbv
H2SO4	Eisele and Tanner [1993]	CIMS	1.1 s	35%	1 x 106 cm-3	1 x 106 cm-3
SO2, O3, H2O column		miniature differential absorption spectroscopy (MIDAS)				

aDependent upon altitude.