MAOS (Mobile Aerosol Observing System) and the G1 Aircraft at
Cape Cod Allie Marquardt Collow
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MAOS
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InstrumentMeasurement Radar Wind ProfilerWind speed and
direction profiles using 1290Mhz and 915Mhz SodarWind velocity and
direction in the lower atmosphere Aerosol SpectrometerAerosol size
and number from 50nm to 1 micron Dual Column CCN CounterNumber of
aerosols that activate to become cloud condensation nuclei two
independently selectable supersaturations Single Particle Soot
PhotometerBlack Carbon mass, size and composition, and single
particle scattering of non- absorbing particles Scanning Mobility
Particle SizerAerosol Size Distribution from 15 to 450 nm
Photo-Acoustic Soot SpectrometerAerosol absorption and scattering
coefficient HumidigraphAerosol scattering coefficient as a function
of relative humidity NephelometerAerosol extinction coefficient
Condensation Particle Counter (10 to >3000nm size range)
Condensation particle concentration, 10nm to >3000nm
Condensation Particle Counter (2.5 to >3000nm size range)
Condensation particle concentration, 2.5nm to >3000nm
Hygroscopic Tandem Differential Mobility Analyzer Aerosol growth
factor as a function of humidity Particle Soot Absorption
PhotometerAerosol absorption coefficient 7-Wavelength
AethelometerOptical Absorption Weather TransmitterTemp, RH, wind
speed and direction, rainfall, barometric pressure Trace Gas
Instrument SystemCO, SO2, NOx Concentrations Particle into Liquid
Sampler-ion Chromatography-water soluble organic carbon Aerosol
chemical composition, anions, cations, water soluble organic carbon
Proton Transfer Mass SpectrometerVolatile Organic Compounds Aerosol
Chemistry Speciation MonitorAerosol mass and composition
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MAOS Aerosol Chemistry Speciation Monitor(ACSM) An aerodynamic
lens samples and focuses submicron particles The focused particle
beam enters two more chambers where particles impact and flash
vaporize on a hot oven Particles are then detected and chemically
characterized using 70eV electron impact quadrupole mass
spectrometry An Aerosol Chemical Speciation Monitor (ACSM) for
Routine Monitoring of the Composition and Mass Concentrations of
Ambient Aerosol, N. L. Ng, S. C. Herndon, A. Trimborn, M. R.
Canagaratna, P. L. Croteau, T. B. Onasch, D. Sueper, D. R. Worsnop,
Q. Zhang, Y. L. Sun and J. T. Jayne,, Aerosol Sci. Tech., 45,
770-784, DOI: 10.1080/02786826.2011.560211, 2011. Sensitivity (g
m-3, 30 minute, 3 ): Organic: 0.3 Sulfate: 0.4 Nitrate: 0.2 NH4:
0.5 Chloride: 0.2
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MAOS
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9 Possible Atmospheric Research Flights for the TCAP campaign
July 7-30, 2012. No flights are planned within 30nm of either BOS
or NY Class B Airspace
MAOS SPLAT II Creates a focused particle beam using an
aerodynamic lens inlet Two stages of differential pumping separate
particles and gas Two stages of optical detection use light
scattering to detect each particle twice and to measure its
velocity, from which the particle aerodynamic diameter is obtained.
Pulsed, synchronized IR evaporation followed by UV ionization of
semi-volatile fractions and ablation of non-volatile fractions
creates ions. From these ions, time-of-flight mass spectra are
generated for compositional analysis
http://www.emsl.pnl.gov/capabilities
/viewInstrument.jsp?id=34020