TABLE 2. PEM-West A DC-8 Measurement Characteristics
Species
Parameter		 Investigator Code Technique Averaging Time Accuracy Nominal
Precision		 Nominal
LOD
NO C LIF 90 sa ±18% 10% at 30 pptv 2 pptv
NO H Chemiluminescence 60 s 6% or 7 pptva 6 pptv 3 pptv
NO2 C PF/LIF 180 sa ±20% 10% at 50-100 pptv 5-12 pptv
NOy C CC/LIF 90 sa ±20% 10% at 200 pptv 10 pptv
NOy H CC/Chemiluminescence 60 s 15% or 30 pptva 30 pptv 15 pptv
O3 E Chemiluminescence 10 s 5% or 2 ppbv 3% or 1 ppbv 1 ppbv
CO J TDL 5 s 1% 1 ppbv or 1% 2 ppbv
CO2 E IR absorption 5 s ±0.25 ppm ±0.1 ppm NA
H2O J TDL 5 s 1% 0.5 ppbv 1 ppbv
CH4 J TDL 5 s 1% 3 ppbv 6 ppbv
Remote O3 vertical profiles D UV DIAL 180 sb 10% or 2 ppbv 5% or 1 ppbv <5ppbv
Remote aerosol vertical profiles D lidar 2 sc 1% 1% NA
H2O N 2- and 3-stage
frost pt. hygro.		 1 min      
H2O G Lyman alpha fluorescence 10 s      
H2O2 F grab samples/
HPLC		 5 min 10% > 150 pptv 15 pptv 20 pptv
H2O2 F aqueous scrubber/
fluorescence		 1 min 10% > 150 pptv 15 pptv 20 pptv
CH3OOH F grab samples/
HPLC		 5 min 15% > 200 pptv 20 pptv 30 pptv
CH3OOH F aqueous scrubber/
fluorescence		 1 min 15% > 200 pptv 20 pptv 30 pptv
Aerosol densitye E optical particle counter 10 s 5%d 5%d 3
Aerosol densityf E optical particle counter 10 s 5%d 5%d 0.01 #/cm3
DMS A GC/QMS 3-4 min <10% <2 pptv <4 pptv
OCS A GC/QMS 3-4 min <10% <1 pptv 1 pptv
SO2 A GC/QMS 3-4 min <10% <2 pptv <4 pptv
CS2 A GC/QMS 3-4 min <10% 0.15 pptv 0.2 pptv
PAN L GC/ECD 150 s ±20% ±10% 2 pptv
PPN L GC/ECD 150 s ±25% ±10% 2 pptv
C2Cl4 L GC/ECD 150 s ±15% ±10% 0.5 pptv
HNO3 M aqueous scrubber/IC 15-40 min 12% 25% 5 pptv
HCOOH M aqueous scrubber/IC 15-40 min 15% 15% 10 pptv
CH3COOH M aqueous scrubber/IC 15-40 min 15% 18% 15 pptv
CH3(CO)COOH M aqueous scrubber/IC 15-40 min 15% 20% 10 pptv
Chloride M filter/IC 15-50 min 15% 35% 30 pptv
Nitrate M filter/IC 15-50 min 15% 10% 5.0 pptv
Oxalate M filter/IC 15-50 min 15% 15% 2.0 pptv
Phosphate M filter/IC 15-50 min 15% 25% 20 pptv
Sulfate M filter/IC 15-50 min 15% 10% 9.0 pptv
Methylsulfonate M filter/IC 15-50 min 15% 15% 1.0 pptv
Ammonium M filter/IC 15-50 min 15% 15% 25 pptv
Sodium M filter/IC 15-50 min 15% 35% 40 pptv
Potassium M filter/IC 15-50 min 15% 20% 17 pptv
Magnesium M filter/IC 15-50 min 15% 10% 6.0 pptv
Calcium M filter/IC 15-50 min 15% 15% 14 pptv
Aluminum M filter/IC 15-50 min 15% 20% 75 pptv
Vanadium M filter/IC 15-50 min 15% 10% 0.05 pptv
7Be M filter/gamma spectroscopy 15-50 min 15% 15% 10 fCi/scm
210Pb M filter/alpha spectroscopy 15-50 min 15% 10% 0.1 fCi/scm
F I grab sample/GG 15-75 s 3% 0.7% 1.0 pptv
F I grab sample/GG 15-75 s 4% 0.8% 1.0 pptv
F I grab sample/GG 15-75 s 5% 1.4% 1.0 pptv
CH3CCl3 I grab sample/GG 15-75 s 10% 3.8% 1.0 pptv
CCl4 I grab sample/GG 15-75 s 5% 1.7% 1.0 pptv
C2C14 I grab sample/GG 15-75 s 10% 4.2% 1.0 pptv
Ethane I grab sample/GG 15-75 s 5% 3% 3 pptv
Ethene I grab sample/GG 15-75 s 10% 5%/3 pptv 3 pptv
Propane I grab sample/GG 15-75 s 5% 3% 3 pptv
Propene I grab sample/GG 15-75 s 10% 5%/3 pptv 3 pptv
i-butane I grab sample/GG 15-75 s 5% 3%/3 pptv 3 pptv
n-butane I grab sample/GG 15-75 s 5% 3%/3 pptv 3 pptv
Ethyne I grab sample/GG 15-75 s 5% 3% 3 pptv
1-butene I grab sample/GG 15-75 s 10% 5%/3 pptv 3 pptv
i-pentane I grab sample/GG 15-75 s 5% 3%/3 pptv 5 pptv
n-pentane I grab sample/GG 15-75 s 5% 3%/3 pptv 5 pptv
1-pentene I grab sample/GG 15-75 s 10% 5%/3 pptv 3 pptv
n<-hexane I grab sample/GG 15-75 s 5% 3%/3 pptv 3 pptv
Isoprene I grab sample/GG 15-75 s 10% 5%/3 pptv 3 pptv
Benzene I grab sample/GG 15-75 s 10% 5%/3 pptv 3 pptv
Toluene I grab sample/GG 15-75 s 10% 5%/3 pptv 3 pptv
Ethane K grab sample/GC 20 s 10% 3% 4 pptv
Ethene K grab sample/GC 20 s 10% 3% 4 pptv
Acetylene K grab sample/GC 20 s 10% 3% 4 pptv
Propane K grab sample/GC 20 s 10% 3% 4 pptv
Propene K grab sample/GC 20 s 10% 3% 4 pptv
n-butane K grab sample/GC 20 s 10% 3% 4 pptv
Isobutane K grab sample/GC 20 s 10% 3% 4 pptv
UV radiation B photocell/Eppley radiometer 10 s ±5% 2% 0.005 mw
cm-2 mv-1
Housekeeping data N DC-8 aircraft 10 s      
A. Alan Bandy, Drexel University;
B. John Barrick, NASA (Langley Research Center);
C. John Bradshaw, Georgia Institute of Technology;
D. Edward Browell, NASA (Langley Research Center);
E. Gerald Gregory, NASA (Langley Research Center);
F. Brian Heikes, University of Rhode Island;
G. Kenneth Kelly, NOAA;
H. Yutaka Kondo, Nagoya University;
I. Sherry Rowland, University of California. Irvine;
J. Glen Sachse, NASA (Langley Research Center);
K. Fumio Sakamaka, National Institute for Environmental Studies;
L. Hanwant Singh, NASA (Ames Research Center);
M. Robert Talbot,University of New Hampshire;
N. DC-8 Aircraft, NASA (Ames Research Center).  
a Applicable to midtroposphere(3.5 - 5.5 km).
b Vertical averaging interval = 300 m (nadir) and 600 m (zenith); horizontal averaging =180 s ~36 km.
c Vertical sampling interval = 60 m; horizontal sampling interval = 2 s ~36 km.
d For total aerosol particle count > 100 particles in 10 s.
e range = 0.12 - 3.12 m diameter
f Size range = 0.5 - 8 m diameter