Size Distribution Data for: UBWOS 2013

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UBWOS: Uintah Basin Winter Ozone Study 2013  Horsepool, Utah 40.1436 N, 109.4677 W 26-January-2013 to 21-February-2013 Link to more UBWOS pages

UBWOS2013 Sizing Download Info

24-May-2013

PLEASE NOTE: These data are subject to revision.

1. The first data set includes particle number-size distributions in the diameter range of 0.011 to 0.478 micrometers Stokes diameter made with an SMPS. All measurements were made at a relative humidity of <25%. The distributions have been cleaned of all data from times of instrument malfunction or calibration.
   files: UBWOS2013_nsd_smps_vX.csv

2. The second data set includes particle number-size distributions in the diameter range of 0.96 to 10 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 sampling mast, distribution tubing and APS inlet. All measurements were made at a relative humidity of <25%. The APS data have been cleaned exactly like the SMPS files described above.
   file: UBWOS2013_nsd_aps_vX.csv

3. The third data set includes particle number-size distributions in the diameter range of 0.020 to 10 micrometers Stokes diameter. The distributions are a combination of SMPS and APS data where the APS data have been 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 SMPS channel was discarded and, after converting to Stokes diameters, the first APS diameter channel that was larger than the last valid SMPS channel was chosen as the first APS channel. Each combined distribution was regridded onto a common set of diameters. Finally, the regridded distributions were cleaned to eliminate values at the larger sizes from the APS where “phantom” counts resulted in a spurious coarse mode in the surface and volume distributions. All measurements were made at a relative humidity of <25%.
   file: UBWOS2013_nsd_smps_aps_vX.csv

4. The fourth data set includes particle mass-size distributions in the diameter range of 0.020 to 10 micrometers Stokes diameter, calculated from the number-size distributions described in the section 3 above. The conversion of number to mass was done using densities calculated from measured chemistry. (download only – not available for plotting)
   file: UBWOS2013_msd_smps_aps_vX.csv

Table 1: Filename keywords

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