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Earth Observing Laboratory
Field Data Archive

DYCOMS-II: C-130 Aerosol LAS-AIR Optical Particle Counter

Summary

The LAS-AIR is a commercial instrument (PMS Model 1001) that measured the size distribution of particles between about 0.1 to > 3 microns diameter in 8 size channels. During DYCOMS, the LAS-AIR was one of a number of instruments sampling off the solid diffuser inlet (SDI) which was mounted on the right side of the C-130 aircraft. To dry the sample and prevent coincidence at high concentrations, the LAS-AIR sample stream was diluted with dry nitrogen in a 5:1 ratio (5 parts N2 to 1 part sample). All flow rates were monitored and maintained with constant volume flow controllers. The LAS-AIR samples over a 6 sec interval, so the data rate is once every 6 seconds. Rather than using the manufacturer's calibration, size limits were calibrated using monodisperse ammonium sulfate aerosol. Additional information on the LAS-AIR itself can be found on the PMS website at http://www.pmeasuring.com/particle/products/aerosol/docs/lasair

Data access

  • ORDER data to made available for download

Additional information

Identifier
Data Quality final
Versions
  • 1.0 (2006-06-12)
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Related projects
Spatial Type point
Frequency < 1 minute
Language English
Categories
Platforms
Instruments
GCMD Science Keywords Expand keywords
Documentation
Related links

Temporal coverage

Begin datetime 2001-07-13 00:00:00
End datetime 2001-07-28 23:59:59

Spatial coverage


Map data from IBCSO, IBCAO, and Global Topography.

Maximum (North) Latitude: 37.00, Minimum (South) Latitude: 26.00
Minimum (West) Longitude: -127.00, Maximum (East) Longitude: -115.00

Primary point of contact information

Cynthia H. Twohy <twohy@nwra.com>

Additional contact information

Citation

Twohy, C. 2006. DYCOMS-II: C-130 Aerosol LAS-AIR Optical Particle Counter. Version 1.0. UCAR/NCAR - Earth Observing Laboratory. https://doi.org/10.26023/TCAM-P9Z3-4813. Accessed 10 Feb 2025.

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NSF

This material is based upon work supported by the NSF National Center for Atmospheric Research, a major facility sponsored by the U.S. National Science Foundation and managed by the University Corporation for Atmospheric Research. Any opinions, findings and conclusions or recommendations expressed in this material do not necessarily reflect the views of the U.S. National Science Foundation.