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Table 2

Summary of DC-8 measurements used in this work. DOI: https://doi.org/10.1525/elementa.400.t2

Instrument NameSpecies MeasuredReference(s)

 
Diode Laser Hygrometer (DLH) water vapor (Diskin et al., 2002) 
Differential Absorption CO Measuerment (DACOM) CO, CH4 (Sachse et al., 1991) 
NOxyO3 Chemiluminescence O3, NO, NO2 (Weinheimer et al., 1994) 
Compact Atmospheric Multi-species Spectrometer (CAMS) CH2O, C2H6 (Weibring et al., 2010; Richter et al., 2015) 
Proton Transfer Time of Flight Mass Spectrometer (PTR-TOF-MS) methanol, acetone + propanal, isoprene, MVK + MACR, benzene, toluene, C8 aromatics (Muller et al., 2014) 
Whole Air Sampler (WAS)a C2-C10 alkanes, C2-C4 alkenes,
C6-C9 aromatics, isoprene 
(Colman et al., 2001) 
Georgia Tech Chemical Ionization Mass Spectrometer (GTCIMS) PAN (Slusher et al., 2004) 
California Institute of Technology Chemical Ionization Mass Spectrometer (CIT-TOF-CIMS) H2O2, CH3OOH (Crounse et al., 2006) 
CCD-Based Actinic Flux Spectrometers (CAFS) 4π sr actinic flux and derived photolysis frequencies (Shetter et al., 1999) 
Instrument NameSpecies MeasuredReference(s)

 
Diode Laser Hygrometer (DLH) water vapor (Diskin et al., 2002) 
Differential Absorption CO Measuerment (DACOM) CO, CH4 (Sachse et al., 1991) 
NOxyO3 Chemiluminescence O3, NO, NO2 (Weinheimer et al., 1994) 
Compact Atmospheric Multi-species Spectrometer (CAMS) CH2O, C2H6 (Weibring et al., 2010; Richter et al., 2015) 
Proton Transfer Time of Flight Mass Spectrometer (PTR-TOF-MS) methanol, acetone + propanal, isoprene, MVK + MACR, benzene, toluene, C8 aromatics (Muller et al., 2014) 
Whole Air Sampler (WAS)a C2-C10 alkanes, C2-C4 alkenes,
C6-C9 aromatics, isoprene 
(Colman et al., 2001) 
Georgia Tech Chemical Ionization Mass Spectrometer (GTCIMS) PAN (Slusher et al., 2004) 
California Institute of Technology Chemical Ionization Mass Spectrometer (CIT-TOF-CIMS) H2O2, CH3OOH (Crounse et al., 2006) 
CCD-Based Actinic Flux Spectrometers (CAFS) 4π sr actinic flux and derived photolysis frequencies (Shetter et al., 1999) 

a All measurements taken at a minimum frequency of 1 Hz except WAS. WAS sample frequency ranged from every 0.5–5 min, depending on aircraft location relative to points of interest, with each canister requiring 0.5 to 1.5 min to fill. On a typical 8 hour flight, about 170 whole air samples were collected.

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