Title: Macquarie Island Particle Concentration (>3nm)

Contact:

   Sonia Kreidenweis
   Dept. of Atmospheric Science
   Colorado State University
   Fort Collins, CO 80521
   USA
   Phone: 970-491-8350
   Fax: 970-491-8449
   E-Mail Address: soniak@aerosol.atmos.colostate.edu

Or

   Fred Brechtel
   Dept. of Atmospheric Science
   Colorado State University
   Fort Collins, CO 80521
   USA
   Phone: 970-491-8401
   Fax: 970-491-8449
   E-Mail Address: fredb@aerosol.atmos.colostate.edu


Data Set Description:

ACE-1:  Macquarie Island Particle Concentration,
        diameter > 3 nm (N/cm3)  (ASCII)

Data Version 1.0

This is data of particle number concentration collected at Macquarie Island
Station from a 4.6 m inlet attached to the meteorological sampling mast of
the station.  The instruments were operated in the clean air laboratory of
the station at ca. 20C and ambient pressure.  The sample was drawn through
the 4.6 m inlet which consisted of ca. 7.6 m of 1.2 cm ID conductive tubing
at a flow rate of 20 L/min.  Ca. 2 m of 1.2 cm ID stainless steel tubing with
a flow rate of 20 L/min carried the sample flow from the conductive tubing to
within 10 cm of the counter inlet. A ca. 10 cm long, 0.5 cm ID stainless
steel tube with flow rate of 1.5 L/min was used to carry the aerosol sample
into the counter. The data are reported in units of number of particles per
cubic centimeter @ 20C and ambient pressure.

n(>3nm) is the concentration greater than nominal 3 nm diameter measured by
model 3025a UCPC; TSI inc., St. Paul, MN., operated at a total flow 1.5 L/min
and aerosol sample flow of 0.03 L/min.

Flow calibration of the instrument was checked (and adjusted as needed)
daily with a bubble flowmeter with an accuracy of +/- 2%. Day to day drift
was always less than 5%.  The instrument was calibrated at the UW/PMEL ACE1
CPC workshop in Seattle, WA, August 1995.  The data from this workshop is
included in the ACE1 data set. The instrument required in-field
re-calibration due to sample flow drift around Julian Date (UTC) 339.942
producing a small, but noticeable offset between this and the Model
3010 particle concentration data.

This record has not been edited for baseline, local contamination or other
meteorological conditions but calibration times and other non-valid,
non-atmospheric data have been removed by the PI's. This results in a
non-continuous time record which would need to be accounted for during any
averaging procedure.

Please contact the PI's for proper acknowledgment before using this data
for publication.

Format: space-delimited ASCII.

The particle counts have been integrated over 1 minute intervals
(ending at the stamped UTC time).

UTC_DATE (YYYY/MM/DD)
UTC_Time (HH:MM:SS)
Julian_day (decimal date)
Particle_Num_Concentration (n>3nm)

File Name Conventions:
   ufcn_fb.dat

References:  None.