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Table 1a. PEM-Tropics B Nominal Measurement Characteristics for DC-8 Instrumentation
SPECIES PARAMETER INVESTIGATOR TECHNIQUE AVERAGING TIME ACCURACY NOMINAL PRECISION NOMINAL LOD
Condensation Nuclei B. Anderson (a) Butanol CN counter 1 sec. 10% 5% 10-3µm
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
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
Remote Aerosol Profile E. Browell (a) UV DIAL 2 sec. (2) 10% <2% (7) 1-20f
molec. scatter
Ozone E. Browell UV DIAL 5 min. (5) 100r 2 ppbv (3) 50r 1 ppbv (4) 2 ppbv
Water Vapor E. Browell LASE 1 min. (9) 6% (6) 4% (16) 0.01 g/kg
Aerosol Scattering Ratio E. Browell LASE 6 sec. instrument
1 min. archive (8)		 100r 0.1 ratio (3) <2% (7) 0.1 to 200
OH B. Brune (d) FAGE-LIF 20 sec. ±40% ±40% 0.015 pptv
HO2 B. Brune FAGE-LIF 20 sec. ±40% ±40% 0.06 pptv
O3 G. Gregory (a) Nitric Oxide Chemiluminescence 1 sec. 30r 2 ppbv 10r 0.8 ppbv 0.8-1000 ppbv
CH2O B. Heikes (e) Dual channel collectors, fluorometers, HPLC 1 min. ±50 pptv
±150f value		 ±30 pptv ±50 pptv
H2O2 B. Heikes Dual channel collectors and fluorometers, HPLC 30 sec. sample
every 2.5 min.		 ±15 pptv
±100f value		 ±10 pptv ±15 pptv
CH3OOH B. Heikes Dual channel collectors and fluorometers, HPLC 30 sec. sample
every 2.5 min.		 ±25 pptv
±150f value		 ±15 pptv ±25 pptv
Water Vapor G. Sachse (a) External Path
Diode Laser		 1 sec. 10% 20r 0.2 ppmv <1 ppmv
CO G. Sachse DACOM IR Laser
Spectrometer		 1 sec. ±20r 1 ppbv 10r 1 ppbv <1 ppbv
CH4 G. Sachse DACOM IR Laser
Spectrometer		 1 sec. 1% 0.1% 0.1%
CO2 G. Sachse LICOR NDIR 1 sec. 0.3 ppmv 50 ppbv 0.2 ppmv
NO S. Sandholm (f) TP-LIF 0.5-600sec. (14) (11) 2.6 pptv (10)
NO2 S. Sandholm TP-LIF 30-180 sec. (15) (12) 5.1 pptv (13)
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
PAN H. Singh (g) EC-GC 120 sec. ±20% ±10% 1 pptv
PPN H. Singh EC-GC 120 sec. ±30% ±10% 1 pptv
C2Cl4 H. Singh EC-GC 120 sec. ±10% ±5% 0.3 pptv
CH3ONO2 H. Singh EC-GC 120 sec. ±20% ±10% 0.5 pptv
C2H5/i-C3H7NO3 H. Singh EC-GC 120 sec. ±20% ±10% 0.2 pptv
CH3COCH3 H. Singh EC-GC 120 sec. ±25% ±15% 20 pptv
C3H3O H. Singh EC-GC 120 sec. ±25% ±15% 20 pptv
CH3OH H. Singh EC-GC 120 sec. ±100% ±25% 20 pptv
CH3CHO H. Singh EC-GC 120 sec. ±100% ±25% 30 pptv
Nitrate R. Talbot (h) Filter Collection/ Ion Chromatography 5-15 min. 20% 20% 10-30 pptv
Beryllium 7 R. Talbot Filter Collection/ Ion Chromatography 20 min. 10% 20% 75 fCi m-3
Ammonium R. Talbot Filter Collection/ Ion Chromatography 5-15 min. 20% 15% 10-30 pptv
Chloride R. Talbot Filter Collection/ Ion Chromatography 5-15 min. 20% 30% 10-30 pptv
Potassium R. Talbot Filter Collection/ Ion Chromatography 5-15 min. 20% 20% 10-30 pptv
Sodium R. Talbot Filter Collection/ Ion Chromatography 5-15 min. 20% 35% 10-30 pptv
Calcium R. Talbot Filter Collection/ Ion Chromatography 5-15 min. 20% 15% 10-30 pptv
Magnesium R. Talbot Filter Collection/ Ion Chromatography 5-15 min. 20% 10% 10-30 pptv
Methyl Sulfonate R. Talbot Filter Collection/ Ion Chromatography 5-15 min. 20% 10% 10-30 pptv
Non-Sea-Salt Sulfate R. Talbot Filter Collection/ Ion Chromatography 5-15 min. 20% 13% 10-30 pptv
Nitric Acid R. Talbot Mist Chamber
Ion Chromatography		 2-6 min. 10-20% 30-35% (<20pptv);
20% (25-100pptv);
15% (>100pptv)		 5 pptv
Sulfur Dioxide R. Talbot Mist Chamber
Ion Chromatography		 2-6 min. 10-20% <20pptv-30 - 35%
25-100pptv - 20%
>100pptv - 15%		 10 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. The vertical averaging interval is 60 meters. Horizontal averaging interval is 2 seconds (approximately 470 meters).
  3. Whichever is larger.
  4. Better than, whichever is larger.
  5. The vertical resolution is 300 meters. Horizontal resolution is 5 minutes (approximately 70 kilometers).
  6. Better than 10% (or 0.1 g/kg)
  7. Better than 3% (or 0.2S/R)
  8. Instrument capability:
    • Vertical resolution is 60 m.,
    • Horizontal resolution is 6 sec.
    Archived data:
    • Vertical sampling interval is 90 m.,
    • Horizontal sampling interval is 60 sec.
    Instrument capability:
    • Nadir-vertical resolution is 510 m.,
    • Horizontal resolution is 5 min.
    • Zenith-vertical resolution is 990-2000 m.,
    • Horizontal resolution is 5 min.
    Archived data:
    • Nadir-vertical sampling interval is 300 m.,
    • Horizontal sampling interval is 1 min.;
    • zenith-vertical sampling interval is is 300 m.,
    • horizontal sampling interval is 1 min.
  9. 2.6 pptv for 108 sec. sample.
    Only 2.60f the NO data is LOD.
    There are sub pptv concentrations on flight 8 for 30 sec. samples.
  10. At 10 pptv NO: 14% @ 5 Hz, 6% @ 1 Hz, and 2% @ 0.1 Hz.
    At 50 pptv NO: 6% @ 5 HZ, 3% @ 1 HZ, and 1% @ 0.1 Hz.
    Also in data files: NO_AMP (pptv)= Ambient measurement precision for NO in units equivalent to pptv.
  11. ±5% (@ 10 pptv NO and NO2, and 0.1 Hz).
    ±5% (@ 100pptv NO and NO2, and 1 Hz.).
    Also in data files: NO2_AMP (pptv) = Ambient measurement precision for the sample period in units of pptv.
  12. About 480f the time LOD data was being measured.
  13. In data files: NO_ETU (pptv)= Estimated total uncertainty on measurement value in units of equivalent pptv.
  14. In data files: NO2_ETU (pptv) = Estimated total uncertainty in the measured value in units of pptv.
  15. Or 0.005 g/kg, whichever is greater.
  1. NASA Langley Research Center
  2. National Center for Atmospheric Research
  3. University of California-Irvine
  4. Pennsylvania State University
  5. University of Rhode Island
  6. Georgia Institute of Technology
  7. NASA Ames Research Center
  8. University of New Hampshire
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