                CTD CALIBRATION: CRUISE CORYSTES 11D/1989                  
                                                                           
Date: October - November 1989                                              
Area: North East Coast                                                     
CTD: Shallow water unit, S/N 47341                                         
                                                                           
                                                                           
Details of Profiles                                                        
Altimeter fitted,  Transmissometer fitted,  logging at 1 sample per  second
(HP 1000A).                                                                
(a) section near 55 deg N, total of 7 profiles                             
(b) anchored station, total of 43 profiles                                 
50 profiles in total.                                                      
                                                                           
                                                                           
Calibration details                                                        
Altimeter  heights  compared  with  CTD  pressure  -  good  agreement  with
corrected CTD pressure using DWT calibration of November 1989.             
                                                                           
DSRTs used to compare with CTD and laboratory calibration.                 
                                                                           
Water samples collected for salinity analysis to compare with CTD.         
                                                                           
Pressure:                                                                  
Post cruise calibration of 16 November 1989                                
                                                                           
  P(cor) = P(ctd) + dP                                                     
where dP = a*P(ctd)*P(ctd) + b*P(ctd) + c                                  
and a =  9.53486e-5                                                        
    b =  1.82488e-3                                                        
    c = -0.48                                                              
                                                                           
Temperature:                                                               
Pre cruise calibration of October 1989                                     
                                                                           
  T(cor) = T(ctd) + dT                                                     
where dT = a*T(ctd)*T(ctd) + b*T(ctd) + c                                  
and a = -5.13940e-5                                                        
    b = -4.68187e-3                                                        
    c =  2.0608e-1                                                         
                                                                           
Salinity:                                                                  
                                                                           
  S(cor) = S(ctd) +dS                                                      
where dS = -0.171                                                          
