Cloud & Aerosol Processes: Instruments

AbbreviationInstrumentMethodContacts

Optical
ULRupward-looking radiometer measures the radiant flux density at three wavelengths through a layer of atmospheric particles; determines how sunlight in the layer is scattered and absorbed More info... Dan Murphy miniature ULR for balloon and UAV use
PASphotoacoustic aerosol absorption spectrometer heats absorbing particles in an acoustic resonator with a laser; measured sound is converted to aerosol absorption coefficient Matt Richardson, Bernie Mason, Nick Wagner
CRD-AEScavity ringdown-aerosol extinction spectrometer measures loss of laser light by aerosol scattering and absorption in an optical cavity; determines aerosol extinction Matt Richardson, Bernie Mason, Nick Wagner
ASTERaerosol scattering-to-extinction ratio measures scattering and extinction of individual aerosol particles in a ring laser cavity Dan Murphy, Matt Richardson

Chemical
AMSaerosol mass spectrometer samples and volatilizes aerosol particles; evolved gases are ionized and measured with a compact time-of-flight mass spectrometer for composition Ann Middlebrook AMS installed on the P3
PALMSparticle analysis by laser mass spectroscopy single particles are vaporized and ionized by a UV laser; composition is determined by a time-of-flight mass spectrometer Dan Murphy, Karl Froyd PALMS in the lab
PiLSparticle-into-liquid sampler dissolves small aerosol particles into liquids for later chemical composition analysis Ann Middlebrook PiLS in the rack on the P3

Size distribution
NMASSnucleation-mode aerosol size spectrometerfive condensation particle counters in parallel estimate particle size distributions from 0.004-0.05 µm 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 µm 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 µm 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 µm diameterChuck Brock

Aerosol physics
PCVIpumped counterflow virtual impactor inertially separates large particles or ice crystals into a dry or inert gas Dan Murphy

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