DYCOMS-II Aircraft: C-130 Aerosol LAS-AIR Optical Particle Counter (Twohy)
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
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|Frequency||< 1 minute|
|Begin datetime||2001-07-13 00:00:00|
|End datetime||2001-07-28 23:59:59|
Map data from IBCSO, IBCAO, and Global Topography.
Maximum (North) Latitude:
Minimum (South) Latitude:
Minimum (West) Longitude: -127.00, Maximum (East) Longitude: -115.00
Additional contact information
CitationExample citation following ESIP guidelines:
Twohy, C. 2006. DYCOMS-II Aircraft: C-130 Aerosol LAS-AIR Optical Particle Counter. Version 1.0. UCAR/NCAR - Earth Observing Laboratory. https://data.eol.ucar.edu/dataset/68.069. Accessed 19 Aug 2019.
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