***  Documentation  for  the CTD data collected on  RRS  Frederick  Russell                                                         
cruise  17/87  (Aug  1987) by the School of Ocean Sciences,  University  of                                                         
Wales, Bangor, under the direction of T.J. Sherwin. ***                                                                             
                                                                                                                                    
The instrument used was a Neil Brown CTD, which performed consistently well                                                         
throughout the cruise.  The only problem was the occasional fouling of  the                                                         
conductivity  sensor by plankton.  The fluorometer and transmissometer were                                                         
added  to the system on the Malin Shelf.  Initially the fluorometer  caused                                                         
spiking on the other channels and had to be removed until the final section                                                         
across the Malin Shelf when it appeared to perform well.                                                                            
                                                                                                                                    
A post-cruise calibration indicated that the temperature readings were 0.05                                                         
degC too high and the salinity 0.068 PSU low. Since thesalinity calculation                                                         
depends  on  temperature  this can be revised to 0.028  PSU  low  when  the                                                         
correct  temperature has been input.  This adjustment has been made and the                                                         
data have been averaged over 5m intervals.                                                                                          
                                                                                                                                    
Reference:                                                                                                                          
                                                                                                                                    
Sherwin, T.J. 1987.  Cruise FR17/87 NW European Continental Shelf Edge, 4th                                                         
August to 24th August, 1987. Report No. U87-6                                                                                       
