Size Distribution Data for: ACE-ASIA

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VESSEL: R/V RONALD H. BROWN  DEPARTED: Honolulu, Hawaii on 15 March, 2001  ARRIVED: Yokosuka, Japan on 20 April 2001 Link to more ACE ASIA pages

18-April-2003
PLEASE NOTE: These data are subject to revision.

• The first data set includes particle number-size distributions in the diameter range of 0.003 to 0.671 micrometers Stokes diameter made with an ultrafine DMPS (to 25 nm) and a DMPS (20 to 671nm). All measurements were made at a relative humidity of 55%.
  file: ACEASIA_nsd_dmps_v05.csv

• The second file includes particle number-size distributions in the diameter range of 0.5 to 20 micrometers aerodynamic diameter. The APS diameters are aerodynamic and have not been corrected to Stokes diameter via calculation or estimates of particle density. The APS data larger than 10 micrometers are not useful due to significant particle losses in the inlets including the ship's sampling mast, distribution tubing and APS inlet. All measurements were made at a relative humidity of 55%.
  file: ACEASIA_nsd_aps_v04.csv

• The third file includes particle number-size distributions in the diameter range of 0.003 to 6.3 micrometers Stokes diameter. The distributions are a combination of DMPS and APS data where the APS data have been corrected for ultra-Stokesian conditions in the instrument jet, corrected for shape effects and converted to Stokes diameters. This conversion was done using densities calculated from measured chemistry. The diameter channels in the overlap region were chosen in the following manner: the last 2 DMPS channels were discarded and, after converting to Stokes diameters, the first APS diameter channel that was larger than the last valid DMPS channel was chosen as the first APS channel. Each combined distribution was regridded onto a common set of diameters. All measurements were made at a relative humidity of 55%.
  file: ACEASIA_nsd_dmps_aps_v02.csv

More information about these data can be found by clicking on the blue "Instrument Information" tab above.

The following files are available for downloading. Please note: one data file may cover more than one time period, thus,some files may be listed more than once. All files are in csv (comma separated value) format. After several lines of general information each file starts with a first row that contains the particle diameter in microns for that column. The first column contains the date/time in Day-of-Year, DOY. DOY 32.5 is 1200 noon UTC on 1-February. All data are in units of dN/dlog10(Dp), N/cm^3. Missing data are designated by a -99 or a -999.

U.S.Dept of Commerce / NOAA / OAR / PMEL / Atmospheric Chemistry