Cloud & Aerosol Processes: Instruments

AbbreviationFull NameDescriptionPersonnel

Optical
PASphotoacoustic aerosol absorption spectrometerheats absorbing particles in an acoustic resonator with a laser; measured sound is converted to aerosol absorption coefficientDan Lack, Dan Law, Matt Richardson
CRD-AEScavity ringdown-aerosol extinction spectrometermeasures loss of laser light by aerosol scattering and absorption in an optical cavity; determines aerosol extinctionJustin Langridge, Dan Lack, Matt Richardson
ASTERaerosol scattering-to-extinction ratiomeasures scattering and extinction of individual aerosol particles in a ring laser cavityShane Murphy, Dan Murphy, Matt Richardson

Chemical
AMSaerosol mass spectrometersamples and volatilizes aerosol particles; evolved gases are ionized and measured with a compact time-of-flight mass spectrometer for compositionAnn Middlebrook
PALMSparticle analysis by laser mass spectroscopysingle particles are vaporized and ionized by a UV laser; composition is determined by a time-of-flight mass spectrometerKarl Froyd, Dan Murphy
PiLSparticle-into-liquid samplerdissolves small aerosol particles into liquids for later chemical composition analysisAnn Middlebrook

Size distribution
NMASSnucleation-mode aerosol size spectrometerfive condensation particle counters in parallel estimate particle size distributions from 0.004-0.05 um diameterChuck Brock
UHSASultra-high sensitivity aerosol spectrometerlaser light scattered from single particles is used to determine their size and concentration in the 0.07-1.0 um diameter rangeChuck Brock
WLOPCwhite-light optical particle counterLED light scattered from single particles is used to determine their size and concentration in the 0.5-8.5 um diameter rangeChuck Brock
SMPSscanning mobility size spectrometerparticles are charged, segregated in an electric field, and counted to determine the size distribution from 0.02-0.7 um diameterChuck Brock

Aerosol physics
PCVIpumped counterflow virtual impactorinertially separates large particles or ice crystals into a dry or inert gasDan Murphy

Cloud physics
CIPcloud imaging probelaser shadow images of cloud-sized particles are used to determine size, concentration, and shape; 25-1550 umChuck Brock
PIPprecipitation imaging probelaser shadow images of precipitation-sized particles are used to determine size, concentration, and shape; 100-6200 umChuck Brock
CDPcloud droplet probeforward scattered laser light from cloud droplets is used to size and count them; 3.0-50 umChuck Brock
CAScloud and aerosol spectrometerforward scattered laser light from aerosol particles and cloud droplets is used to size and count them; 0.05-50 umChuck Brock