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Instrument
Description:
1)
Instrument Function.
The
Multiple Aerosol Collection System contains an impactor collector which
permits the collection of particles on electron microscope grids for later
chemical-constituent analysis. The collector consists of a two
stages. In the first stage the pressure of the sample is reduced by
a factor of two without loosing particles by impaction on walls. The
second stage consists of a thin plate impactor which collects efficiently
even at small Reynolds numbers. The system collects particles as
small as 0.02 micron at WB-57F cruise altitudes. As many as 24
samples can be collected in a flight.
2) Utility of the Data.
Aerosol composition also shows strong gradients near the tropopause
(Sheridan et al., 1994) and will be very informative concerning rocket
emissions.
3) Instrument Characteristics.
Response: Control routines dictate the sampling duration and
frequency. Typically, sampling on an individual grid lasts 5 minutes
(in the stratosphere). Frequency of samples are typically time or
pressure dependent for up to 24 samples.
Weight: Approximately 38 lbs.
Dimensions:
19" Rack mountable, 7" x 19" x 18"
References:
Sheridan,
P. J., Brock, C. A., Wilson J. C., “Aerosol particles in the upper
troposphere and lower stratosphere: Elemental composition and morphology
of individual particles in northern midlatitudes” Geophysical Research
Letters, 21, 2587-2590, 1994.
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