Instrument : Aerosol Observing System (AOS)

Instrument Categories
Aerosols

General Overview

The aerosol observing system (AOS) is the primary Atmospheric Radiation Measurement (ARM) platform for in situ aerosol measurements at the surface. The principal measurements are those of the aerosol absorption and scattering coefficients as a function of the particle size and radiation wavelength. Additional measurements include those of the particle number concentration, size distribution, hygroscopic growth, and inorganic chemical composition. The AOS measures aerosol optical properties to better understand how particles interact with solar radiation and influence the earth's radiation balance. The measurements are useful for calculating parameters used in radiative forcing calculations such as the aerosol single scattering albedo, asymmetry parameter, mass scattering efficiency, and hygroscopic growth. To learn more, see the preliminary data plots.

The first AOS is located at the Southern Great Plains (SGP) site in Oklahoma and has been operational since the beginning of April 1996. In 2005, a second AOS joined the first ARM Mobile Facility (AMF); the third AOS became operational with the second AMF. With funding from the American Recovery and Reinvestment Act of 2009, another AOS joined the ARM Facility and is available for deployments with either ARM Mobile Facility and/or the ARM fixed sites and capable of being deployed independently. For a list of instruments included in the AOS, see the Mobile AOS web page.

In March 2000, a long-term vertical profiling campaign began over the SGP site using a light aircraft. The measurements from the vertical profiles complement the surface measurements because the instrumentation on the airplane is similar to that at the SGP surface site. The aircraft measurements provide information on the aerosol vertical mixing.For more information and data, see the In-situ Aerosol Profiles (IAP) instrument page.

The AOS includes the following components:

  • acsm : Aerosol Chemical Speciation Monitor
  • aeth : Aethalometer
  • aosmet : Meteorological Measurements associated with the Aerosol Observing System
  • ccn : Cloud Condensation Nuclei Particle Counter
  • clap : Continuous Light Absorption Photometer
  • cpc : Condensation Particle Counter
  • htdma : Humidified Tandem Differential Mobility Analyzer
  • nephelometer : Nephelometer
  • ozone : Ozone Monitor
  • pass : Photoacoustic Soot Spectrometer
  • pils : Particle Into Liquid Sampler
  • psap : Particle Soot Absorption Photometer
  • ptr-ms : Proton Transfer Reaction Mass Spectrometer
  • smps : Scanning mobility particle sizer
  • sp2 : Single Particle Soot Photometer
  • tracegas : Trace gas concentrations
  • uhsas : Ultra-High Sensitivity Aerosol Spectrometer

Output Datastreams

  • aos : Aerosol Observing System (AOS): aerosol data, 1-min
  • aosacsm : AOS: aerosol chemical speciation monitor
  • aosccn : Aerosol Observing System (AOS): cloud condensation nuclei data
  • aosccn100 : Aerosol Observing System (AOS): cloud condensation nuclei data
  • aosccn200 : AOS: Dual Column Cloud Condensation Nuclei Counter
  • aosco : AOS: Carbon Monoxide Analyzer
  • aoscpc : AOS: condensation particle counter
  • aoscpcf : AOS: Condensation Particle Counter
  • aoscpcu : AOS: Ultrafine Condensation Particle Counter
  • aosnephdry : AOS: ambient nephelometer measurements
  • aosnephwet : AOS: humidified nephelometer measurements
  • aosnox : AOS: Oxides of Nitrogen Analyzer
  • aosozone : AOS: O3 measurements
  • aospsap3w : AOS: 3 wavelength Particle Soot Absorption Photometer
  • aossmps : AOS: Scanning-Mobility Particle Sizer
  • aossmpstrh : AOS: Scanning-Mobility Particle Sizer; temperature and RH output
  • aosso2 : AOS: Sulfur Dioxide Analyzer
  • aosuhsas : AOS: Ultra-High Sensitivity Aerosol Spectrometer
  • noaaaos : Aerosol Observing System (AOS): aerosol data, 1-min, mentor-QC applied
  • noaaaosavg : Aerosol Observing System (AOS): aerosol data, 60-min avg, mentor-QC applied

Primary Measurements

The following measurements are those considered scientifically relevant.

Locations

Eastern North Atlantic
ENAC1Browse DataGraciosa Island, Azores, Portugal
North Slope Alaska
NSAX1Browse DataExternal Data (satellites and others)
Southern Great Plains
SGPC1Browse DataCentral Facility, Lamont, OK
ARM Mobile Facility
FKBM1Browse DataBlack Forest, Germany
GRWM1Browse DataGraciosa Island, Azores, Portugal
HFEM1Browse DataShouxian, Anhui, China
MAGM1Browse DataLos Angeles, CA to Honolulu, HI - container ship Horizon Spirit
MAOM1Browse DataManacapuru, Amazonas, Brazil; AMF1
NIMM1Browse DataNiamey, Niger
PGHM1Browse DataARIES Observatory, Nainital, Uttarkhand, India
PVCM1Browse DataHighland Center, Cape Cod MA; AMF 1
PYEM1Browse DataPoint Reyes, CA
SBSS2Browse DataSteamboat Springs CO, Christie Peak
TMPS1Browse DataU. of Helsinki Research Station (SMEAR II), Hyytiala, Finland; AOS

See Also

Contact(s)

Gunnar Senum
(631) 344-3896
gsenum@bnl.gov

Chongai Kuang
(631) 344-7257
ckuang@bnl.gov

Thomas Watson
(631) 344-4517
twatson@bnl.gov

Manvendra Dubey
(505) 665-3128
dubey@lanl.gov

Stephen Springston
(631) 344-4477
srs@bnl.gov

Arthur Sedlacek
(631) 344-2404
sedlacek@bnl.gov

Anne Jefferson
(303) 497-6493
anne.jefferson@noaa.gov

Annette Koontz
Developer
(509) 375-3609
annette.koontz@pnnl.gov

Cynthia Salwen
associate
631-344-7112
salwen@bnl.gov

Bill Behrens
associate
(631) 344-2906
behrens@bnl.gov