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Table 1b. PEM-Tropics B Nominal Measurement Characteristics for P-3B Instrumentation

SPECIES PARAMETER INVESTIGATOR TECHNIQUE AVERAGING TIME ACCURACY NOMINAL PRECISION NOMINAL LOD
U Wind component B. Anderson (a) TAMMS 20 Hz. 0.5 m/s 0.5 m/s 0.5 m/s
V Wind component B. Anderson TAMMS 20 Hz. 0.5 m/s 0.5 m/s 0.5 m/s
W Wind component B. Anderson TAMMS 20 Hz. 0.5 m/s 0.2 m/s 0.5 m/s
CH3ONO2 E. Atlas (b) (1) 15-80 sec. 10-20% (2) 5-10% 0.05 pptv
C2H5ONO2 E. Atlas (1) 15-80 sec. 10-20% (2) 5-10% 0.05 pptv
i-C3H7ONO2 E. Atlas (1) 15-80 sec. 10-20% (2) 5-10% <0.1 pptv
n-C3H7ONO2 E. Atlas (1) 15-80 sec. 10-20% (2) 5-10% 0.1 pptv
2-C4H9ONO2 E. Atlas (1) 15-80 sec. 10-20% (2) 5-10% 0.05 pptv
CH2Cl2 E. Atlas (1) 15-80 sec. 10-20% (2) 5-10% 2 pptv
CHCl3 E. Atlas (1) 15-80 sec. 10-20% (2) 5-10% 2 pptv
C2Cl4 E. Atlas (1) 15-80 sec. 10-20% (2) 5-10% 0.05 pptv
HFC134A E. Atlas (1) 15-80 sec. 10-20% (2) 5-10% 0.05 pptv
HCFC22 E. Atlas (1) 15-80 sec. 10-20% (2) 5-10% 10 pptv
HCFC142B E. Atlas (1) 15-80 sec. 10-20% (2) 5-10% <0.05 pptv
HCFC141B E. Atlas (1) 15-80 sec. 10-20% (2) 5-10% <0.05 pptv
CH2Br2 E. Atlas (1) 15-80 sec. 10-20% (2) 5-10% 0.4 pptv
CHBr2Cl E. Atlas (1) 15-80 sec. 10-20% (2) 5-10% <0.05 pptv
CHBr3 E. Atlas (1) 15-80 sec. 10-20% (2) 5-10% 0.005 pptv
SO2 A. Bandy (c) GC/MS 5 min. 10% >5% (3) 1 pptv
DMS A. Bandy GC/MS 5 min. 10% >5% (3) 1 pptv
CH3Cl D. Blake (c) GC/MS 15-80 sec. 5% 5-10% 100 pptv
CFC-12 D. Blake GC/MS 15-80 sec. 2% 0.7% 1 pptv
CFC-114 D. Blake GC/MS 15-80 sec. 5% 1.5% 1 pptv
CFC-11 D. Blake GC/MS 15-80 sec. 2% 0.8% 3 pptv
F-113 D. Blake GC/MS 15-80 sec. 2% 1.4% 3 pptv
HCFC-141B D. Blake GC/MS 15-80 sec. 10-20% 5-10% 0.5 pptv
HCFC-134a D. Blake GC/MS 15-80 sec. 10-20% 5-10% 0.5 pptv
HCFC-22 D. Blake GC/MS 15-80 sec. 5% 1.5% 10 pptv
HCFC-142b D. Blake GC/MS 15-80 sec. 10-20% 5-10% 0.5 pptv
CH3Br D. Blake GC/MS 15-80 sec. 5% 4% 1 pptv
CH2Cl2 D. Blake GC/MS 15-80 sec. 10% 5% 2 pptv
CHCl3 D. Blake GC/MS 15-80 sec. 5% 5-10% 2 pptv
1,2-C2H4Cl2 D. Blake GC/MS 15-80 sec. 20% 3-10% 0.05 pptv
CHBr2Cl D. Blake GC/MS 15-80 sec. 10-20% 5-10% 0.005 pptv
CH2BrCl D. Blake GC/MS 15-80 sec. 20% 3-10% 0.01 pptv
CH3CCl3 D. Blake GC/MS 15-80 sec. 5% 1% 3 pptv
CCl4 D. Blake GC/MS 15-80 sec. 5% 1% 3 pptv
CH2Br2 D. Blake GC/MS 15-80 sec. 10-20% 5-10% 0.4 pptv
CHBrCl2 D. Blake GC/MS 15-80 sec. 10-20% 5-10% 0.05 pptv
C2Cl4 D. Blake GC/MS 15-80 sec. 10% 1-5% 0.05%
CHBr3 D. Blake GC/MS 15-80 sec. 10-20% 5-10% 0.005 pptv
H-1211 D. Blake GC/MS 15-80 sec. 5% 2% 0.1 pptv
H-2402 D. Blake GC/MS 15-80 sec. 5% 5% 0.1 pptv
CH3I D. Blake GC/MS 15-80 sec. 10% 5-10% 0.05 pptv
DMS D. Blake GC/MS 15-80 sec. 10% 3-10% 1 pptv
CH3ONO2 D. Blake GC/MS 15-80 sec. 10-20% 5-10% 0.05 pptv
C2H5ONO2 D. Blake GC/MS 15-80 sec. 10-20% 5-10% 0.05 pptv
i-C3H7ONO2 D. Blake GC/MS 15-80 sec. 10-20% 5-10% <0.1 pptv
n-C3H7ONO2 D. Blake GC/MS 15-80 sec. 10-20% 5-10% <0.1 pptv
2-C4H9ONO2 D. Blake GC/MS 15-80 sec. 10-20% 5-10% 0.05 pptv
Ethane D. Blake GC/MS 15-80 sec. 5% 10r 2 pptv 3 pptv
Propene D. Blake GC/MS 15-80 sec. 10% 3 pptv 2 pptv
Propane D. Blake GC/MS 15-80 sec. 5% 10r 2 pptv 3 pptv
Cyclopropane D. Blake GC/MS 15-80 sec. 10% 2-20% 3 pptv
Propadiene D. Blake GC/MS 15-80 sec. 5% 20r 2 pptv 3 pptv
i-Butane D. Blake GC/MS 15-80 sec. 5% 10r 2 pptv 2 pptv
n-Butane D. Blake GC/MS 15-80 sec. 5% 10r 2 pptv 2 pptv
t-2-Butene D. Blake GC/MS 15-80 sec. 5% 20r 2 pptv 3 pptv
1-Butene D. Blake GC/MS 15-80 sec. 5% 20r 2 pptv 3 pptv
i-Butene D. Blake GC/MS 15-80 sec. 5% 20r 2 pptv 3 pptv
c-2-Butene D. Blake GC/MS 15-80 sec. 5% 20r 2 pptv 3 pptv
Ethyne D. Blake GC/MS 15-80 sec. 5% 10r 2 pptv 2 pptv
Ethylene D. Blake GC/MS 15-80 sec. 5% 10r 2 pptv 2 pptv
i-Pentane D. Blake GC/MS 15-80 sec. 5% 10r 2 pptv 2 pptv
n-Pentane D. Blake GC/MS 15-80 sec. 5% 10r 2 pptv 2 pptv
Isoprene D. Blake GC/MS 15-80 sec. 10% 30r 3 pptv 2 pptv
n-Hexane D. Blake GC/MS 15-80 sec. 10% 2-20% 3 pptv
Cyclohexane D. Blake GC/MS 15-80 sec. 10% 2-20% 3 pptv
Benzene D. Blake GC/MS 15-80 sec. 5% 20r 2 pptv 3 pptv
n-Heptane D. Blake GC/MS 15-80 sec. 10% 2-20% 3 pptv
Toluene D. Blake GC/MS 15-80 sec. 5% 20r 2 pptv 3 pptv
n-Octane D. Blake GC/MS 15-80 sec. 10% 2-20% 3 pptv
Ethylbenzene D. Blake GC/MS 15-80 sec. 10% 20r 2 pptv 3 pptv
m/p-Xylene D. Blake GC/MS 15-80 sec. 10% 20r 2 pptv 3 pptv
p/m-Xylene D. Blake GC/MS 15-80 sec. 10% 20r 2 pptv 3 pptv
o-Xylene D. Blake GC/MS 15-80 sec. 5% 20r 2 pptv 3 pptv
2,2,4-Trimethylpentane D. Blake GC/MS 15-80 sec. 10% 2-20% 3 pptv
2,3,4-Trimethylpentane D. Blake GC/MS 15-80 sec. 10% 2-20% 3 pptv
DMSO F. Eisele (e) CIMS 60 sec. ±30% ±15% 1 pptv
Ammonia F. Eisele CIMS 60 sec. ±30% ±15% 1 pptv
OH F. Eisele CIMS 30 sec. ±35% ±20% 2 x 105 molec/cc
H2SO4 F. Eisele CIMS 30 sec. ±35% ±20% 1 x 105 molec/cc
MSA F. Eisele CIMS 30 sec. ± factor of 2 ±20% 2 x 105 molec/cc
Ozone G. Gregory (a) Nitric Oxide
Chemiluminescence		 1 sec. 30r 2 ppbv 10r 0.8 ppbv (4)
2-3% (5)		 0.8-1000 ppbv
CH2O B. Heikes (f) Dual Concurrent
Coil Collection		 1 min. ±50 pptv
±150f value		 ±30 pptv ±50 pptv
H2O2 B. Heikes Concurrent Coil Collection,
High Pressure Liquid Chromatography Separation,
Enzyme Derivitization Fluorescence		 30 sec. sample every 5 min. ±15 pptv
±100f value		 ±10 pptv ±15 pptv
CH3OOH B. Heikes Concurrent Coil Collection,
High Pressure Liquid Chromatography Separation,
Enzyme Derivitization Fluorescence		 30 sec. sample every 5 min. ±25 pptv
±150f value		 ±15 pptv ±25 pptv
NO B. Ridley (b) O3/NO Chemiluminescence 5 sec. 1.5 pptv ±(2.5 + 1.5 + 50f reported mixing ratio) pptv 2.5 pptv
NO2 B. Ridley (b) O3/NO Chemiluminescence 5 sec. 1.5 pptv ±(2.5 + 1.5 + 50f reported mixing ratio) pptv 2.5 pptv
Ozone B. Ridley (b) O3/NO Chemiluminescence 1 sec. 50r 2-3 ppbv (6) > 0.5 ppbv 0.05 ppbv
CO G. Sachse (a) Differential Absorption IR 1 sec. ±2% 10r 1 ppbv <1 pptv
CO2 G. Sachse Differential Absorption IR 1 sec. 0.3 ppmv 50 ppbv 0.2 ppmv
Photolysis frequencies:
J(HNO2),
J(HNO3),
J(H2O2),
J(CH2O_CO),
J(CH3OOH),
J(CH3ONO2),
J(CH3CH2ONO2),
J(CH3COCH3),
J(PAN),
J(O3),
J(CH2O_HCO),
J(NO2)		 R. Shetter (b) Nadir & Zenith
Spectroradiometer		 10 sec. 10% 5% 1x10-8 sec-1JO(1D)
3x10-8 sec-1 J(NO2)
Total Solar Actinic Flux vs Wavelength R. Shetter Scanning Actinic Flux Spectroradiometers 10 sec. 10% 5% <0.05µW/cm2 /nm
HNO3 R. Talbot (g) Mist Chamber Ion Chromatography 2-6 min. 10-20% 30-35% (<20pptv)
20% (25-100pptv)
15% (>100pptv)		 5 pptv
NO3 R. Talbot Filter Collection/ Ion Chromatography 5-15 min. 20-25% 20% 10-30 pptv
nss-SO4 R. Talbot Filter Collection/ Ion Chromatography 5-15 min. 20-25% 13% 10-30 pptv
MS R. Talbot Filter Collection/ Ion Chromatography 5-15 min. 20-25% 10% 10-30 pptv
NH4 R. Talbot Filter Collection/ Ion Chromatography 5-15 min. 20-25% 15% 10-30 pptv
NOTES:
  1. Analysis was performed on whole air samples acquired by D. Blake.
    The analytical technique was gas chromatography with mass spectrometric (EI and NICI) detection.
  2. Higher uncertainty for molecules with mixing ratios in the .001 - .1 pptv range.
  3. Above 20 pptv.
  4. At 2 Hz response.
  5. At 10 Hz.
  6. Whichever is larger.
  1. NASA Langley Research Center
  2. National Center for Atmospheric Research
  3. Drexel University
  4. University of California-Irvine
  5. Georgia Institute of Technology
  6. University of Rhode Island
  7. University of New Hampshire
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