PLEASE NOTE: These data are subject to revision.
The first two data sets include particle number-size distributions in the
diameter range of 0.020 to 0.8 micrometers Stokes diameter made with an "Aitken"
DMPS (20 to 200 nm) and an "Accumulation" DMPS (200 to 800nm). All measurements
were made at a relative humidity of 60%. The distributions have been cleaned of
all data from times of instrument malfunction or calibration. Additionally, the
data set with “SeaSweep” in the name contains only those distributions collected
while the seasweep was deployed and connected to the inlet. The files files
without the keyword contain distributions taken during normal, ambient sampling.
files: WACS_nsd_dmps_vX.csv WACS_nsd_dmps_SeaSweep_vX.csv
The second two data sets include 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 ship's
sampling mast, distribution tubing and APS inlet. During seasweep sampling the
upper diameter limit was reducde to 6.5 micrometers due to the extra tubing. All
measurements were made at a relative humidity of 60%. The APS data have been
cleaned exactly like the DMPS files described above.
file: WACS_nsd_aps_vX.csv WACS_nsd_aps_SeaSweep_vX.csv
The third two data sets include particle number-size distributions in the
diameter range of 0.020 to 10 micrometers Stokes diameter. The distributions are
a combination of DMPS 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 DMPS channel was 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. 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 60%.
file: WACS_nsd_dmps_aps_vX.csv WACS_nsd_dmps_aps_SeaSweep_vX.csv
The fourth two data sets include 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: WACS_msd_dmps_aps_vX.csv WACS_msd_dmps_aps_SeaSweep_vX.csv
number size distribution
mass size distribution
from seasweep sampling periods
|Start Date||End Date||ASCII file|