BODC FIXED STATION DOCUMENT NO.  64225                     
                                                                                
                         Site History : Dakar-D, Senegal                        
                         ===============================                        
                                                                                
    Station name         : Dakar-D                  Latitude:  14 40.0N         
    Country              : Senegal                 Longitude: 017 25.8W         
    GLOSS No.            : 253                Time Reference: GMT (hours 00-23) 
    Contributor          : 1986-1989 TOGA Sea Level Center                      
    Instrument type      : Aanderaa WLR5 (bottom-mounted pressure gauge)        
    Site Gauge           :                                                      
    Observational periods: 1982 - 1989                                          
                                                                                
                                                                                
    Reference Level:                                                            
    Due to the nature of the  bottom-mounted pressure gauges,  no link could be 
    established between the zero of the gauge  values and fixed points on land. 
    Also, tide staff observations or the like were unavailable. This series has 
    no long-term reference level.                                               
                                                                                
                                                                                
    Quality Assessment by the UH Sea Level Center:                              
                                                                                
    Comment: The depth of the instrument in the water was about 8 m.            
             Techniques of data processing by  the originator are  discussed in 
             the second reference below.                                        
                                                                                
             The Dakar pressure gauge records consist of four separate segments 
                                                                                
                   Dakar-A: 24 Dec 1982 - 12 Dec 1983                           
                   Dakar-B: 12 Dec 1983 - 09 Jan 1985                           
                   Dakar-C: 30 May 1986 - 16 Dec 1986                           
                   Dakar-D: 16 Dec 1986 - 24 May 1989                           
                                                                                
             The series was broken into  segments because level  jumps could be 
             identified at the time of instrument replacements.                 
                                                                                
             Due to the  tendency  for pressure  gauge  sensors to drift, it is 
             beneficial  for  investigators to  know  the  time  span  of  each 
             instrument deployment (time/date as yyyy/mm/dd/hh(GMT)):           
                                                                                
                   Series   start           stop                                
                   Dakar-A  1982/12/24/13 - 1983/01/25/10                       
                   Dakar-A  1983/01/25/12 - 1983/03/17/15                       
                   Dakar-A  1983/03/17/17 - 1983/05/16/10                       
                   Dakar-A  1983/05/16/11 - 1983/07/20/10                       
                   Dakar-A  1983/07/20/11 - 1983/12/12/10                       
                   Dakar-B  1983/12/12/11 - 1984/04/30/11                       
                   Dakar-B  1984/04/30/12 - 1984/10/04/11                       
                   Dakar-B  1984/10/04/12 - 1985/01/09/12                       
                   Dakar-C  1986/05/30/15 - 1986/12/16/15                       
                   Dakar-D  1986/12/16/23 - 1988/09/21/01                       
                   Dakar-D  1988/11/11/10 - 1989/05/24/10                       
                                                                                
             For more information:                                              
                                                                                
                   Verstraete, J.M., 1988. Sea level variations in the tropical 
                   Atlantic.    Time series of  ocean measurements,   Technical 
                   series, UNESCO,4,33-47.                                      
                                                                                
                   Verstraete, J.M., 1992. Accuracy of shallow pressure gauges. 
                   Joint  IAPSO-IOC  Workshop on  Sea  Level  Measurements  and 
                   Quality Control,  Paris,  12-13 October, 1992.  IOC Workshop 
                   Report No. 81, UNESCO.  pp. 70-76.                           
                                                                                
                   CI MISSING              REPLACED GAPS     QUESTIONABLE       
             YEAR (%) DATA                 OR BAD DATA       FLUCTUATIONS       
             ---- --- -------------------- --------------- -------------------- 
             1986   4 none                 none            none                 
             1987 100 none                 none            none                 
             1988  86 265-316              (18)129-(06)130 none                 
                                           (15)188-(01)189                      
                                           (20)235-(19)236                      
             1989  39 none                 none            none