Suggested CODIAC data set name ACE-1: Cape Grim PRELIMINARY Particle Concentration, diameters > 3 nm and >10 nm (N/cm3) (ASCII) Description of data FILE START TIME (UTC) = MMDDHHMMSS=1118081500 FILE STOP TIME (UTC) = 1214184500 PI NAME = D. COVERT FACILITY = CGS = Cape Grim Station, Tasmania DATA VERSION = 1.0 preliminary D. COVERT; UNIVERSITY OF WASHINGTON, BOX 354235, SEATTLE, WA, 98195-4235 DIRECT READING PARTICLE COUNTER DATA, PARTICLE NUMBER CONCENTRATION This is data of particle number concentration collected at Cape Grim Station from the 10m inlet on the roof of the station. The instruments were operated in the monitoring room of the station at ca. 20C and ambient pressure. The sample was withdrawn from the 10 m inlet via one of the isokinetic probes and ca. 3 m of 1.2 cm ID conductive tubing to a distribution manifold at 20 L/min. 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 flow1.5 L/min and aerosol sample flow of 0.03 L/min. n(>10nm) is the concentration greater than nominal 10 nm diameter measured by model 3010 UCPC; TSI inc., St. Paul, MN, operated at a flow1.0 L/min. The particle counts have been integrated over 15 minute intervals (beginning at the stamped UTC time) which correspond to the intervals for the individual number-size distribution data collected at Cape Grim. The data have been corrected for coincidence loss by the counters. Flow calibration of the instruments 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 instruments were calibrated at the UW/PMEL ACE1 CPC workshop in Seattle, WA, August 1995. The data from this workshop will be included in the NCAR, ACE1 data set. 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.