Mobile Aerosol Observing System

Intensive aerosol observations conducted on the campus of Brookhaven National Laboratory on Long Island, New York, using the ARM Mobile Aerosol Observing System.
Intensive aerosol observations conducted on the campus of Brookhaven National Laboratory on Long Island, New York, using the ARM Mobile Aerosol Observing System.

The Mobile Aerosol Observing System is an instrument suite available for deployments with either ARM Mobile Facility and/or the ARM fixed sites. This system is also capable of being deployed independently in a field campaign.

Comprised of two separate 20-ft containers (MAOS-A and MAOS-C), the Mobile Aerosol Observing System has one for aerosol and one for chemistry measurements, with integrated data acquisition systems, instrument controls, ventilation systems, and air pumps. Because of the unit’s portable nature, all instrument racks are shock mounted.

The following instruments are part of the suite. The Mobile AOS is similar to the standard ARM AOS and the data and documentation are available through the AOS web page.


Aerosol Instruments in MAOS-A

Instrument Title Instrument Mentor Measurement Group Measurements
Sonic Detection And Ranging (SODAR) System (1000 to 4000 Hz) Rich Coulter Atmospheric State Wind velocity and direction (u,v,w) in the lower atmosphere
Ultra-High Sensitivity Aerosol Spectrometer (enhanced) Gunner Senum Aerosols Aerosol size and number from 50 nm to 1 micron
Dual Column Cloud Condensation Nuclei Counter (CCN) Gunner Senum Aerosols Number of aerosols that activate to become cloud condensation nuclei two independently selectable supersaturations
Single Particle Soot Photometer (SP2) Art Sedlacek Aerosols Black Carbon mass, size and composition, and single particle scattering of non-absorbing particles
Scanning Mobility Particle Sizer (SMPS) Chongai Kuang Aerosols Aerosol size distribution from 15 nm to 450 nm
Photo-Acoustic Soot Spectrometer (PASS), 3 Wavelength Manvendra Dubey Aerosols Aerosol absorption and scattering coefficient
Humidigraph (Scanning Relative Humidity with 3 single wavelength nephelometers) Gunner Senum Aerosols A 3 wavelength nephelometer that can either be dried or humidified.
Nephelometer, 3 Wavelength Gunner Senum Aerosols Aerosol extinction coefficient
Condensation Particle Counter (Fine CPC. CPCF in data discovery), 10 nm to >3000 nm particle size range Chongai Kuang Aerosols Condensation particle concentration, 10 nm to >3000 nm
Condensation Particle Counter (Ultrafine CPC. CPCU in data discovery), 2.5 nm to >3000 nm particle size range Chongai Kuang Aerosols Condensation particle concentration, 2.5 nm to >3000 nm
Hygroscopic Tandem Differential Mobility Analyzer (HTDMA) Gunner Senum Aerosols Aerosol growth factor as a function of humidity
Particle Soot Absorption Photometer (PSAP), 3 Wavelength Stephen Springston Aerosols Aerosol absorption coefficient
7-Wavelength Aethelometer Art Sedlacek Aerosols Optical Absorption
Weather Transmitter (WXT-520) Stephen Springston Atmospheric State Temperature, relative humidity, wind speed and direction, rainfall, and barometric pressure
Aerosol Chemistry Speciation Monitor (ACSM) Tom Watson Aerosols Aerosol mass and composisiton
Radar Wind Profiler (RWP) Richard Coulter Aerosols Wind profiler/radio acoustic sounding system. Available in 915-MHz (for U.S. deployments only).


Chemistry Instruments in MAOS-C

Instrument Title Instrument Mentor Measurement Group Measurements
Trace Gas Instrument System (Research-Grade) Stephen Springston Gases Carbon Monoxide, Sulphur Dioxide, Nitric Oxide/Nitrous Dioxide/Nitrogen Oxides, Ozone) [CO, SO2, NO/NO2/NOy, O3]
Particle Into Liquid Sampler-Ion Chromatography-Water Soluble Organic Carbon (PILS-IC-WSOC) Tom Watson Aerosols Aerosol chemical composition, anions, cations, and water soluble organic carbon
Proton Transfer Mass Spectrometer (PTRMS) Tom Watson Gases Volatile organic compounds