Aerodyne / Harvard University / Montana State University/ Molina Center


  • Scott Herndon
  • Ezra Wood
  • Berk Knighton
  • Tim Onasch
  • Ben Lee
  • John Jayne
  • Bill Munger
  • Ed Fortner
  • Sally Ng
  • Miguel Zavala


There will be three components of measurements from the Aerodyne/Harvard/Montana State/Molina Center team during SHARP:

1) HONO measurements at Moody tower

The Aerodyne/Harvard HONO/NO2 sensor is based upon absorption spectroscopy in the mid-infrared spectral region using continuous wave quantum cascade lasers. Ambient sample is drawn through a siloxyl-coated glass inlet with a built-in critical orifice upstream a virtual impactor. The sampled air is transported at reduced pressure (~30 torr) through Teflon tubing and into a 5 L siloxyl-coated glass multi-pass cell through which IR light (NO2 at 1604 cm-1; HONO at 1659 cm-1) traverses a path of 210 m. Detection limits for HONO and NO2 are estimated as 500 pptv and 20 pptv (S/N = 2, one second measurements).

2) ACSM aerosol measurements at Moody tower

The ARI Aerosol Chemical Speciation Monitor (ACSM) measures aerosol mass and chemical composition of non-refractory submicron aerosol particles in real-time. It can provide composition information for particulate ammonium, nitrate, sulfate, chloride, and organics. The ACSM is designed and built around the same technology as the larger research grade AMS but uses lower cost components and thus sacrifices some sensitivity and time resolution. However, the ACSM has sufficient sensitivity to operate as a monitoring instrument providing chemically speciated mass loadings and aerosol mass spectra at data rates up to 15 min for typical urban aerosol loadings (several ug/m3 loadings). Currently, the ACSM does not report aerosol size data. This will be the second field deployment for this prototype instrument.

3) The Aerodyne mobile laboratory

The AML is a panel truck outfitted with a range of instrumentation for the measurement of a range of particulate and gaseous pollutants. The mobile lab payload for SHARP will include quantum cascade laser TILDAS instruments (CO, NO2, HCHO, HCOOH, and C2H4), the Montana State U. PTR-MS (numerous VOCs including 1,3-butadiene), standard gas-phase (Thermo / 2B Tech / Licor) measurements (NO, O3, and CO2), a condensation particle counter (particle number), an aerosol mass spectrometer (size-resolved particle mass and chemical speciation), a multi-angle absorption photometer (black carbon), and a scanning mobility particle sizer. During SHARP, the mobile laboratory will make diurnal measurements at fixed sites, collect emissions data from on-road vehicles, and participate in FLAIR.

aerodyne/home.txt · Last modified: 2009/04/02 11:36 by tihuang
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