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PEM-Tropics A
Nominal Measurement Characteristics of Instruments on the DC-8

SPECIES PARAMETER INVESTIGATOR TECHNIQUE AVERAGING TIME ACCURACY NOMINAL PRECISION NOMINAL LOD
NO J. Bradshaw TP-LIF 9.6 sec
(ranging from 0.22 - 556 sec)		 62.6 ±63.3 pptv (1) 6.0 ±5.5 pptv (1) 0.89 ±0.89 (ranging from 0.14 - 5.09 pptv)
NO2 J. Bradshaw PF/TP-LIF 3 min 12 ±16 pptv (2) 2.6 ±2.24 pptv (2) 4.4 ±3.4 pptv
O3 G. Gregory Chemiluminescence 0.5 sec 3% or 2 ppbv 2% 0r 1 ppbv 1 ppbv
CO G. Sachse TDL 5 sec 1% 1 ppbv or 1% NA
CH4 G. Sachse TDL 5 sec 1% 3 ppbv NA
CO2 G. Sachse Non-Dispersive IR 5 sec 1% 50 ppbv NA
H2O vapor G. Sachse Diode Laser
Specrometer		 0.05 sec ±10% ±2% or 0.2 ppm 0.2 ppm
CO2 S. Vay NDIR 5 sec 300 ppbv 100 ppbv NA
Remote O3 Profile E. Browell UV DIAL 5 min (3) 10% or 2 ppbv 5% or 1 ppbv <5 ppbv
Remote Aerosol Profile E. Browell UV DIAL (visible) 2 sec (4) 10% 1% NA
H2O J. Barrick Cryogenic Chilled Mirror Hygrometer 1 sec ±0.5 - 1.0 °C ±0.2 °C -100 °C
H2O2 B. Heikes Grab Samples/HPLC 2.5 min ±30% 10 pptv 15 pptv
CH3OOH B. Heikes Grab Samples/HPLC 2.5 min ±30% 15 pptv 25 pptv
Condensation Nuclei (CN) B. Anderson Butanol CN Counter 10 sec 10% 5% 25.4 (Ultra-Fine)-
0.547 (Fine)
DMS A. Bandy GC/GMS 3-5 min <10% 1 pptv 2
SO2 A. Bandy GC/GMS 3-5 min <10% 1pptv 1
PAN H. Singh GC/ECD 150 sec ±20% ±10% or ±1 pptv 1
PPN H. Singh GC/ECD 150 sec ±30% ±20% or ±1 pptv 1
C2Cl4 H. Singh GC/ECD 150 sec ±10% ±10% or ±1 pptv 0.5
Methyl_Nitrate H. Singh GC/ECD 150 sec ±20% ±10% 1
Ethyl/i-Propyl_Nitrate H. Singh GC/ECD 150 sec ±20% ±10% 1
HNO3 R. Talbot Aqueous Scrub/IC 4-8 min 30-35% (5) 30-35% <20 pptv
HCOOH R. Talbot Aqueous Scrub/IC 4-8 min 15% 15% 10-31 pptv
CH3COOH R. Talbot Aqueous Scrub/IC 4-8 min 20% 20% 10-31 pptv
Chloride R. Talbot Filter/IC 10-20min 30% 35% 20
Nitrate R. Talbot Filter/IC 10-20 min 20% 10% 10
Oxalate R. Talbot Filter/IC 10-20 min 10% 15% 1
Sulfate R. Talbot Filter/IC 10-20 min 13% 10% 3.5
Methylsulfonate R. Talbot Filter/IC 10-20 min 10% 15% 0.5
Ammonium R. Talbot Filter/IC 10-20 min 15% 15% 20
Sodium R. Talbot Filter/IC 10-20 min 35% 35% 50
Potassium R. Talbot Filter/IC 10-20 min 20% 20% 15
Magnesium R. Talbot Filter/IC 10-20 min 10% 10% 6.5
Calcium R. Talbot Filter/IC 10-20 min 15% 15% 15
Be-7 R. Talbot Filter/Gama Spectroscopy 10-20 min 20% 15% 100 fCi/scm
Pb-210 R. Talbot Filter/Alpha Spectroscopy 10-20 min 20% 10% 0.1 fCi/scm
CFC-12 D. Blake Grab Sample/GC 10-75 sec 2% 0.7% 1.0
CFC-11 D. Blake Grab Sample/GC 10-75 sec 2% 0.8% 3
CFC-113 D. Blake Grab Sample/GC 10-75 sec 2% 1.4% 3
CFC-114 D. Blake Grab Sample/GC 10-75 sec 5% 1.5% 1
HCFC-22 D. Blake Grab Sample/GC 10-75 sec 5% 1.5% 10
H-1301 D. Blake Grab Sample/GC 10-75 sec 5% 2% 0.1
H-1211 D. Blake Grab Sample/GC 10-75 sec 5% 2% 0.1
H-2402 D. Blake Grab Sample/GC 10-75 sec 5% 5% 0.1
CH3Cl D. Blake Grab Sample/GC 10-75 sec 5% 2% 100
CH3Br D. Blake Grab Sample/GC 10-75 sec 5% 4% 1
CH3I D. Blake Grab Sample/GC 10-75 sec 10% 5-10% (6) 0.05
CHCl3 D. Blake Grab Sample/GC 10-75 sec 5% 2% 2
CH3CCl3 D. Blake Grab Sample/GC 10-75 sec 5% 1% 3
CCl4 D. Blake Grab Sample/GC 10-75 sec 5% 1% 3
C2Cl4 D. Blake Grab Sample/GC 10-75 sec 10% 1-5% (6) 0.05
CHBrCl2 D. Blake Grab Sample/GC 10-75 sec 10-20% (6) 5-10% (6) 0.05
CH2Br2 D. Blake Grab Sample/GC 10-75 sec 10-20% (6) 5-10% (6) 0.4
CHClBr2 D. Blake Grab Sample/GC 10-75 sec 10-20% (6) 5-10% (6) 0.005
CHBr3 D. Blake Grab Sample/GC 10-75 sec 10-20% (6) 5-10% (6) 0.005
Methyl Nitrate D. Blake Grab Sample/GC 10-75 sec 10-20% (6) 5-10% (6) 0.05
Ethyl Nitrate D. Blake Grab Sample/GC 10-75 sec 10-20% (6) 5-10% (6) 0.05
1-Propyl Nitrate D. Blake Grab Sample/GC 10-75 sec 10-20% (6) 5-10% (6) 0.05
2-Propyl Nitrate D. Blake Grab Sample/GC 10-75 sec 10-20% (6) 5-10% (6) 0.05
2-Butyl Nitrate D. Blake Grab Sample/GC 10-75 sec 10-20% (6) 5-10% (6) 0.05
Ethane D. Blake Grab Sample/GC 10-75 sec 5% 1% or 2 pptv 3
Ethene D. Blake Grab Sample/GC 10-75 sec 10% 3 pptv 2
Propane D. Blake Grab Sample/GC 10-75 sec 5% 1% or 2 pptv 3
Propene D. Blake Grab Sample/GC 10-75 sec 10% 3 pptv 2
i-Butane D. Blake Grab Sample/GC 10-75 sec 5% 1% or 2 pptv 2
n-Butane D. Blake Grab Sample/GC 10-75 sec 5% 1% or 2 pptv 2
Ethyne D. Blake Grab Sample/GC 10-75 sec 5% 1% or 2 pptv 2
Isoprene D. Blake Grab Sample/GC 10-75 sec 10% 3% or 3 pptv 2
n-Pentane D. Blake Grab Sample/GC 10-75 sec 5% 1% or 2 pptv 2
i-Pentane D. Blake Grab Sample/GC 10-75 sec 5% 1% or 2 pptv 2
CH3ONO2 E. Atlas (7) 10-75 sec 10-20% (6) 5-10% (6) < 0.1 ppt (8)
C2H5ONO2 E. Atlas (7) 10-75 sec 10-20% (6) 5-10% (6) < 0.1 ppt (8)
i-C3H7ONO2 E. Atlas (7) 10-75 sec 10-20% (6) 5-10% (6) < 0.1 ppt (8)
n-C3H7ONO2 E. Atlas (7) 10-75 sec 10-20% (6) 5-10% (6) < 0.1 ppt (8)
2-C4H9ONO2 E. Atlas (7) 10-75 sec 10-20% (6) 5-10% (6) < 0.1 ppt (8)
3-CH3-2-C4H9ONO2 E. Atlas (7) 10-75 sec 10-20% (6) 5-10% (6) < 0.1 ppt (8)
3-C5H11ONO2 E. Atlas (7) 10-75 sec 10-20% (6) 5-10% (6) < 0.1 ppt (8)
2-C5H11ONO2 E. Atlas (7) 10-75 sec 10-20% (6) 5-10% (6) < 0.1 ppt (8)
CH2Cl2 E. Atlas (7) 10-75 sec 10-20% (6) 5-10% (6) <1 ppt (8)
HCFC141B E. Atlas (7) 10-75 sec 10-20% (6) 5-10% (6) < 0.1 ppt (8)
HCFC142B E. Atlas (7) 10-75 sec 10-20% (6) 5-10% (6) < 0.1 ppt (8)
HFC134A E. Atlas (7) 10-75 sec 10-20% (6) 5-10% (6) < 0.1 ppt (8)
CH2Br2 E. Atlas (7) 10-75 sec 10-20% (6) 5-10% (6) < 0.1 ppt (8)
CHBrCl2 E. Atlas (7) 10-75 sec 10-20% (6) 5-10% (6) < 0.1 ppt (8)
CHBr2Cl E. Atlas (7) 10-75 sec 10-20% (6) 5-10% (6) < 0.1 ppt (8)
CHBr3 E. Atlas (7) 10-75 sec 10-20% (6) 5-10% (6) < 0.1 ppt (8)
J(NO2) Zenith & Nadir J. Barrick Hemispherical Radiometer 1 sec ±5% ±1% NA
Nadir & Zenith Spectroradiometer R. Shetter Actinic Flux Spectroradiometry 30 sec ±5% ±5% (9)
Aircraft Ephemeris Data DC-8 GPS 1 sec ±25m ±25m 1m
Surface Temperature DC-8 Pyrometer 1 sec ±0.5 °C ±0.2 °C -50 °C
Dew Point DC-8 2 & 3 Stage Frost Point Hygrometer 1 sec ±0.5 - 1.0 °C ±0.2 °C -100 °C

NOTES:
  1. Total uncertainty is 8.4 ±8.9 pptv
  2. Total uncertainty is 3.7 ±4 pptv
  3. The vertical resolution is 300 meters. Horizontal resolution is 5 minutes (approximately 70 kilometers). The data are archived at a vertical sampling interval of 300 meters and a horizontal sampling interval of 60 seconds (approximately 14 kilometers).
  4. The vertical averaging interval is 60 meters. Horizontal averaging interval is 2 seconds (approximately 470 meters). The data are archived at a vertical sampling interval of 90 meters and a horizontal sampling interval of 60 seconds (approximately 14 kilometers).
  5. 30-35 % @ LOD, 20% @ 25-100 pptv, 15% @ >100 pptv
  6. Higher uncertainty for molecules with mixing ratios in the .001 - .1 pptv range.
  7. Analysis was performed on whole air samples aquired by D. Blake. The analytical technique was gas chromatography with mass spectrometric (EI and NICI) detection.
  8. For some molecules with mixing ratios near the limit of detection, null values were used to replace zero values for reasons of analytical problems or to indicate limit of detection.
  9. The given lower limits of detection are the 2-sigma values of the flight period 02:50-03:10 on Oct. 6th (during total darkness).
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