README for /ctdascii/
(Tim Stanton, Oceanography Department, Naval Postgradute School,
 Monterey, CA 93943. 831 656 3144     stanton@oc.nps.navy.mil  )


Overview:
     
     This CTD profile timeseries was measured
during the SHEBA ice station field program by co-PI's Stanton,
Martinson, Morison and McPhee. An automated CTD winch repeatedly
lowered a dual sensor Sea Bird 911+ CTD from the ice depth to
150m with approximately a 10 minute cycle time. Data streams from 
a microstructure package and full bandwidth CTD data stream were recorded
on a PC-based data acquisition system implemented by Jim Stockel
and Jake Yazzci of NPS, and daily summary files were forwarded by
satellite link to NPS for daily QC of all the sensors. The CTD data 
were independently recorded by a data acquisition system designed 
by Roger Anderson of UW APL.
   

     Data contained in the attached files represent 1m vertically 
binned values of temperature and salinity for each downcast of the 
CTD profiler. Profiles with significant differences between 
the redundant sensors have been edited out. Bio fouling of the pumped 
sensors was the primary cause of bad data points, and this problem 
was only significant during the late summer period. An edit level of 100
in our interactive editor has been used, eliminating obviously contaminated
profiles from the data matrices.


FORMAT

The data are separated into 10 day sections, with separate files for 
temperature (filename suffix T), salinity (filename suffix S), potential
density (filename suffix D) and profile time in yearday (filename suffix Y).
the file naming convention is "shebactd" start yearday_end yearday_suffix code.
The profile timeseries data are flat ascii arrays, and can be read into, for
example, MATLAB using the load command.