Size Distribution Data for: Aerosols99-INDOEX

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VESSEL: R/V RONALD H. BROWN DEPARTED: Norfolk, Virginia on 14 January 1999 VIA Cape Town, South Africa, 8-11 February Mauritius, 20-22 February Male, Maldives 1-4 March Male, Maldives 23-26 March ARRIVED: Male, Maldives on 30 March 1999 link to more Aerosols99-INDOEX pages

For each cruise leg of Aerosols99 and INDOEX we have four particle size distribution data sets available for plotting and/or downloading.

1. A "dry" DMPS (Differential Mobility Analyzer) measured particle number size distribution in the diameter range of 0.003 to 0.67 microns during Aerosols99 and 0.003 to 0.9 microns during INDOEX .
   (Files: AEROINDO99_nsd_dmps_dry_AERO.csv AEROINDO99_nsd_dmps_dry_INDO.csv)

2. A "wet" (RH=55%) DMPS measured particle number size distributions in the diameter range of 0.022 to 0.677 microns during Aerosols99 and 0.022 to 0.9 microns during INDOEX.
   (Files: AEROINDO99_nsd_dmps_wet_AERO.csv AEROINDO99_nsd_dmps_wet_INDO.csv)

3. A "dry" APS measured particle number size distribution in the aerodynamic diameter range of 0.54 to 5 microns during Aerosols99 and 0.54 to 17 microns during INDOEX. (Here aerodynamic diameter means that the particle has the aerodynamic drag force equivalent to a unit density particle of that diameter.)
   (Files: AEROINDO99_nsd_aps_dry_AERO.csv AEROINDO99_nsd_aps_dry_INDO.csv )

4. A DMPS-APS, diameter corrected, composite size distribution. The APS diameters have been corrected from aerodynamic diameter at 33% RH to the geometric diameter at RH 55%. The correction uses a calculated density from the chemical composition obtained with a seven stage impactor and a thermodynamic model to calculate the water content of the particles at 55% RH. The size range in the composite size distribution is 0.22 to 5 microns for Aerosols99 and 0.022 microns to 10 microns for INDOEX.
   (Files: AEROINDO99_nsd_dmps_aps_AERO_L1.csv AEROINDO99_nsd_dmps_aps_AERO_L2.csv AEROINDO99_nsd_dmps_aps_INDO.csv)

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