NOAA ship Discoverer 
Ancillary Data 
Reduced and Compiled by NOAA-PMEL 
Version 1, 26 March 1996 
Jim Johnson and Tim Bates 
 
Data Files 1Mnnn.CSV contains one-minute data of the following 
parameters: 
 
DOY 
hour
minute
Relative WS
Relative WD
UFCN (Particles >3nm) 
Precipitation 
Solar Radiation 


File names	DAYS	
1M286.CSV 	286-290
1M290.CSV	290-300
1M300.CSV	300-310
1M310.CSV	310-320
1M320.CSV	320-330
1M330.CSV	330-340
1M340.CSV	340-346



DOY: 
The data are compiled in 30 minute averages from 15 minutes before to 15 
minutes after the half hour.  The time is given as decimal day of year (DOY) 
such that DOY 32.5 is 12 noon GMT on February 1. 
 
Wind:
Wind speed and direction were measured with the PMEL Qualimetrics
anemometer mounted above the top of the rain/seaspray shelter at the top of
aerosol/gas sampling mast.  The location of the PMEL anemometer was
chosen primarily to select the times when the sampling mast was in the 'clean'
sector, not being influenced by ship pollution.
The data from the PMEL anemometer were recorded on the PMEL data
logger as one minute averages.

Relative wind speed (Rel WS) is the 1 minute average of the wind speed (in
m/s) relative to the ship.  The relative wind direction (Rel WD) is the 1
minute average of the wind direction relative to the bow of the ship (0
degrees, wind is dead ahead; +90, wind is from the starboard beam ; -90,
wind is from the port beam).


Total Particle Number (UFCN):  
The total number of particles with diameters > 3nm were measured with a 
TSI 3025 UFCN.  The inlet was at the top of the aerosol sampling mast 
forward of the bridge.  This raw data file includes instances when the aerosol 
mast was in the ship's exhaust and is meant to serve as an indicator of 
clean/dirty sampling conditions. Units are particles per cubic centimeter. 
 
Rainfall: 
Rainfall was measured with a Scientific Technology Inc. ORG-100 Optical 
Precipitation Intensity Sensor.  The instrument was mounted on the railing of 
Aero van and was used along with wind direction, wind speed and CN to 
control the aerosol chemistry pumps.  The dynamic range of the sensor is 0.5 
to 1600 mm/h.  Spikes in the signal are often associated with sea spray.  The 
1 minute data include all data points.  The data are reported in units of mm/hr. 
 
Solar Radiation: 
Total solar radiation was measured with an Epply Black and White 
Pyranometer (horizontal surface receiver -180), model 8-48, serial number 
12946 mounted on the top of AeroVan.  The instruments was calibrated by 
The Eppley Laboratory on October 11, 1994.  There were times when the 
sampling mast shaded the sensor.  Most of these times occurred for about a 
30 minute period in the afternoon. (When the ship was traveling South, the 
mast was West of the sensor). There were also times when the ship's mast 
shaded the sensor.  Both of these shading events can be clearly seen in the 
sky camera pictures.  These "bad" data due to shading have not been edited 
out of the data record.  The data reported here are in units of watts per
square meter.