Table 1. Instrumentation and Measurement Parameters During ICARTT

Instrument	Measurement	Measured Property	Measurement Principle
Forward scattering spectrometer probe (FSSP)	cloud droplet number distribution	geometric diameter: 1.5-37 mum	optical forward scattering
Cloud, aerosol, and precipitation spectrometer (CAS)	cloud droplet number distribution	geometric diameter: 0.5-50 mum	optical forward scattering and 2-D imaging
Condensation particle counter (CPC)	aerosol number concentration	geometric diameter > (3 nm, 7 nm, 13 nm)	varying supersaturations of butanol
Dual automated classifier aerosol detector (DACAD)	aerosol size distribution	geometric diameter: 10-800 nm	classification by electrical mobility
Passive cavity aerosol spectrometer probe (PCASP)	aerosol size distribution	geometric diameter: 100-2500 nm	optical scattering
Aerodynamic particle sizer (APS)	aerosol size distribution	aerodynamic diameter: 500-10,000 nm	aerodynamic classification
Three-column cloud condensation nuclei counter (CCN)	CCN concentration	three supersaturations	activation at constant supersaturation; optical detection of droplets
Aerodyne aerosol mass spectrometer (AMS)	aerosol chemical composition	mass concentration: SO42-, NH4+, NO3-, OC	Flash ionization; quadrapole mass spectrometer
Particle-into-liquid sampler (PILS)	aerosol chemical composition	mass concentration: SO42-, NH4+, NO3-, oxalate	ion chromatography
C-Navigational System and Novatel GPS	updraft velocity, wind speed	wind velocity; aircraft position and altitude	wind velocity = aircraft ground velocity (C-MIGITS INS/GPS) - aircraft air velocity (turbulence and Pitot-static probes)