Atmospheric Radiation Measurement Climate Research Facility US Department of Energy



LASIC SSA-constraint study

20 July 2017 - 12 September 2017

Lead Scientist: Paquita Zuidema

Observatory: amf, asi

The ability of black-carbon-containing smoke to absorb sunlight allows smoke to exert a warming on the Earth’s radiative climate. The intrinsic radiative property of smoke supporting the absorption, or the single-scattering-albedo (SSA), varies with composition, aging, and hygroscopicity. The SSA is still poorly constrained for smoke emanating from African continental fires after long-range transport. Filter-based techniques such as the Particle Soot Absorption Photometer (PSAP), nephelometers and aethalometers estimate extinction from the change in light transmission through particle-imbibed filters. The Cavity Attenuated Phase Shift (CAPS)-SSA uses entirely different approach. It utilizes a unique optical design to simultaneously measure aerosol light extinction and scattering in the same sample volume. These can then be used to derive the SSA and aerosol absorption. The CAPS-SSA absorption estimate will serve as a reference and anchor for the longer-term filter-based measurements, helping to fulfill an important goal of the LASIC campaign and of the ASR Aerosol Working Group. This endeavor is a joint effort between Aerodyne and DOE ARM.


Andrew Freedman
Timothy Onasch
Arthur Sedlacek


  • Parent Campaign
  • Sibling Campaign


Riihimaki LD, KL Gaustad, and CN Long. 2019. Radiative Flux Analysis (RADFLUXANAL) Value-Added Product: Retrieval of Clear-Sky Broadband Radiative Fluxes and Other Derived Values. Ed. by Robert Stafford, ARM user facility. DOE/SC-ARM-TR-228. 10.2172/1569477.


Zuidema P, A Sedlacek, C Flynn, S Springston, R Delgadillo, J Zhang, A Aiken, A Koontz, and P Muradyan. 2018. "The Ascension Island Boundary Layer in the Remote Southeast Atlantic is Often Smoky." Geophysical Research Letters, 45(9), 10.1002/2017GL076926.

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Campaign Data Sets

IOP Participant Data Source Name Final Data
Timothy Onasch Cavity Attenuated Phase Shift Single Scattering Albedo Monitor Order Data

ASI Data Sources

Name Full Name Browse Data
ACSM Aerosol Chemical Speciation Monitor Browse Data
ACSMCDCE ACSM, corrected for composition-dependent collection efficiency Browse Data
AERI Atmospheric Emitted Radiance Interferometer Browse Data
AERINF AERI Noise Filtered Browse Data
AETH Aethalometer Browse Data
AOD-MFRSR Aerosol Optical Depth (AOD) derived from MFRSR measurements Browse Data
AOP Aerosol Optical Properties Browse Data
AOS Aerosol Observing System Browse Data
AOSMET Meteorological Measurements associated with the Aerosol Observing System Browse Data
CCN Cloud Condensation Nuclei Particle Counter Browse Data
CCNSMPSKAPPA CCN Counter and SMPS derived hygroscopicity parameter kappa Browse Data
CEIL Ceilometer Browse Data
CEILPBLHT Boundary-layer height data with CEIL Browse Data
CO-ANALYZER Carbon Monoxide Analyzer Browse Data
CPC Condensation Particle Counter Browse Data
CSPHOT Sunphotometer Browse Data
DL Doppler Lidar Browse Data
DLPROF-WIND Doppler Lidar Horizontal Wind Profiles Browse Data
DLPROF-WSTATS Doppler Lidar Wind Statistics Profiles Browse Data
ECMWFDIAG European Centre for Medium Range Weather Forecasts Diagnostic Analyses Browse Data
ECOR Eddy Correlation Flux Measurement System Browse Data
GNDRAD Ground Radiometers on Stand for Upwelling Radiation Browse Data
HTDMA Humidified Tandem Differential Mobility Analyzer Browse Data
INTERPSONDE Interpolated Sonde Browse Data
IRT Infrared Thermometer Browse Data
KASACR Ka-Band Scanning ARM Cloud Radar Browse Data
KAZR Ka ARM Zenith Radar Browse Data
KAZRARSCL Active Remote Sensing of CLouds (ARSCL) product using Ka-band ARM Zenith Radars Browse Data
KAZRCOR KAZR Corrected Data Browse Data
MET Surface Meteorological Instrumentation Browse Data
MFR Multifilter Radiometer Browse Data
MFRSR Multifilter Rotating Shadowband Radiometer Browse Data
MFRSRCLDOD Cloud Optical Properties from MFRSR Using Min Algorithm Browse Data
MICROBASEKAPLUS improved MICROBASE product with Uncertainties Browse Data
MPL Micropulse Lidar Browse Data
MPLCMASK Cloud mask from Micropulse Lidar Browse Data
MWR Microwave Radiometer Browse Data
MWR3C Microwave Radiometer, 3 Channel Browse Data
MWRHF Microwave Radiometer - High Frequency Browse Data
MWRP Microwave Radiometer Profiler Browse Data
MWRRET MWR Retrievals Browse Data
NDROP Droplet number concentration Browse Data
NEPHELOMETER Nephelometer Browse Data
NFOV Narrow Field of View Zenith Radiometer Browse Data
NOX Nitrogen Oxides Monitor Browse Data
OZONE Ozone Monitor Browse Data
PBLHT Planetary Boundary Layer Height Browse Data
PSAP Particle Soot Absorption Photometer Browse Data
QCECOR Quality Controlled Eddy Correlation Flux Measurement Browse Data
QCRAD Data Quality Assessment for ARM Radiation Data Browse Data
RADFLUXANAL Radiative Flux Analysis Browse Data
RAIN Rain Gauge Browse Data
RWP Radar Wind Profiler Browse Data
SASHE Shortwave Array Spectroradiometer-Hemispheric Browse Data
SASZE Shortwave Array Spectroradiometer-Zenith Browse Data
SEBS Surface Energy Balance System Browse Data
SKYRAD Sky Radiometers on Stand for Downwelling Radiation Browse Data
SMPS Scanning mobility particle sizer Browse Data
SO2 Sulfur Dioxide Monitor Browse Data
SODAR Mini Sound Detection and Ranging Browse Data
SONDE Balloon-Borne Sounding System Browse Data
SONDEGRID Gridded Sonde VAP Product Browse Data
TSI Total Sky Imager Browse Data
UHSAS Ultra-High Sensitivity Aerosol Spectrometer Browse Data
VISST Minnis Cloud Products Using Visst Algorithm Browse Data
WACR W-Band (95 GHz) ARM Cloud Radar Browse Data
WACRARSCL W-band Cloud Radar Active Remote Sensing of Cloud Browse Data
WB Weighing Bucket Precipitation Gauge Browse Data
WSACR W-band Scanning ARM Cloud Radar Browse Data