Cloud & Aerosol Processes: Instruments

AbbreviationInstrumentMethodContacts

Optical

miniSASPminiature scanning aerosol sun photometer 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 miniSASP
miniature upward-looking radiometer (ULR) for balloons and UAVs
PASphotoacoustic aerosol absorption spectrometer heats absorbing particles in an acoustic resonator with a laser; measured sound is converted to aerosol absorption coefficient 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 Nick Wagner
aPASphotoacoustic spectroscopy measures dry aerosol optical absorption at 660 nm, 532 nm, and 405 nm; additional channels for measurement of absorption from thermal denuded aerosol; designed for deployment aboard aircraft and has flown on the NOAA WP-3D and the NASA DC-8 Nick Wagner aCRD and aPAS
aPAS and aCRD share electronics, DAQ, and instrument rack
aCRDcavity ringdown spectroscopy measures dry aerosol optical extinction at 660 nm, 532 nm, and 405 nm; additional channels for measurement of humidified and thermal denuded aerosol; designed for deployment aboard aircraft and has flown on the NOAA WP-3D and the NASA DC-8 Nick Wagner
gCRD-PAScavity ringdown spectroscopy and photoacustic spectroscopy under construction - measures dry aerosol absoroption, extinction and single scatter albedo at 532nm; designed to operate remote and unatteded for several weeks Nick Wagner gCRD-PAS
opCRDcavity ringdown spectroscopy measures aerosol extinction under ambient conditions in an open-path cavity at 670nm; designed for ground sampling Dan Murphy, Nick Wagner opCRD
ASTERaerosol scattering-to-extinction ratio measures scattering and extinction of individual aerosol particles in a ring laser cavity Dan Murphy

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 BrockNMASS in the lab
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 BrockUHSAS in the lab
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

CCPCloud Combination Probe: cloud imaging and cloud droplet probelaser shadow images of cloud-sized particles are used to determine size, concentration, and shape; 25-1550 µm;
forward scattered laser light from cloud droplets is used to size and count them; 3.0-50 µm
Chuck Brockcloud combination probe in the lab
PIPprecipitation imaging probelaser shadow images of precipitation-sized particles are used to determine size, concentration, and shape; 100-6200 µmChuck BrockPIP installed on the P3
CAScloud and aerosol spectrometerforward scattered laser light from aerosol particles and cloud droplets is used to size and count them; 0.05-50 µmChuck BrockCAS instrument in the lab