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 |
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Related projects | |
Spatial Type | point |
Frequency | < 1 minute |
Language | English |
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Platforms | |
Instruments | |
GCMD Science Keywords | Expand keywords |
Documentation |
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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
- principalInvestigator: Cynthia H. Twohy <twohy@nwra.com>
- author: Cynthia H. Twohy <twohy@nwra.com>
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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