These data are provided to help those researches who would like
high time resolution data to check for episodes of possible ship contamination
in their measurements. The data are given in a csv (comma separated value)
ascii format. Users may save the files to a local disk and open them
up in a common spreadsheet like Excel.
The wind was measured with the PMEL Qualimetrics Skyvane 2100 anemometer
which was located at the top of the PMEL aerosol
sampling mast. The relative wind speed is in meters per
second and the direction is in degrees from the ship's bow. Wind
from
dead ahead is 0 degrees, wind from the port beam is -90 degrees,
wind from the starboard beam is +90 degrees. The 1-minute
record from three particle counters (CN) is also given. During conditions
of ship contamination, there were noticeable spikes in the CN record.
The CN data, available on this page have been edited to remove values
when the CN counters were returning bad data (such as when they were low
on butyl alcohol, when the butyl alcohol was saturated with water, or during
calibration periods). These bad data have been replaced with -99.
In this data set the ship contamination has not been edited out.
There are also spikes of CN in the data that result from ships passing
upwind of the Ronald H Brown. The three CN counters
were CN1D, the TSI 3010 that sampled Directly from the sample mast
inlet. CN1C, the TSI 3010 Control that sample from a faster
sample line that the data system used to detect ship contamination periods,
and UFCN1 the TSI 3025, that sampled Ultra Fine particles from the
sample mast inlet (all particles > 3 nm diameter). All CN data is
in units of particles per cubic centimeter. Please note that
there are time gaps in the files, some minutes are missing.
Data files for each leg of Aerosols99 and INDOEX can be downloaded here.
| Aerosols99 leg 1 | cn_relwind_1min_a1.csv |
| Aerosols99 leg 2 | cn_relwind_1min_a2.csv |
| INDOEX leg 1 | cn_relwind_1min_i1.csv |
| INDOEX leg 2 | cn_relwind_1min_i2.csv |
| INDOEX leg 3 | cn_relwind_1min_i3.csv |
An example part of a data file is given below
| DOY | Hr | Min | CN1C | CN1D | UFCN1 | WS_rel | WD_rel |
| DecDay | hr | min | CPC3010 | CPC3010 | UCPC3025 | m/s | DegFromBow |
| 30.4965 | 11 | 55 | 166 | 167 | 190 | 11.9 | -10.7 |
| 30.4972 | 11 | 56 | 168 | 168 | 191 | 11.5 | -6.8 |
| 30.4979 | 11 | 57 | 168 | 169 | 192 | 11.2 | -6.1 |
| 30.4986 | 11 | 58 | 169 | 168 | 196 | 11.4 | -7.9 |
| 30.4993 | 11 | 59 | 168 | 168 | 190 | 10 | -2.5 |
| 30.5 | 12 | 0 | 169 | 169 | 197 | 11.1 | -7 |
| 30.5007 | 12 | 1 | 170 | 170 | 191 | 12.2 | -10.7 |
| 30.5014 | 12 | 2 | 171 | 170 | 194 | 11.8 | -9.9 |
| 30.5021 | 12 | 3 | 171 | 169 | 189 | 11.3 | -8.2 |
| 30.5028 | 12 | 4 | 169 | 168 | 188 | 10.9 | -7.4 |
| 30.5035 | 12 | 5 | 170 | -99 | 187 | 10.7 | -5.2 |
| 30.5042 | 12 | 6 | 170 | -99 | 194 | 11.8 | -10.1 |
| 30.5049 | 12 | 7 | 170 | -99 | 187 | 11.7 | -9 |
| 30.5056 | 12 | 8 | 170 | -99 | 189 | 11.5 | -8 |
Please direct any questions to Jim Johnson <johnson@pmel.noaa.gov>
or Tim Bates <bates@pmel.noaa.gov>
