QUALITY ASSESSMENT OF SEA LEVEL DATA                
                                           by the                               
                   UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER     
                                 JOINT ARCHIVE FOR SEA LEVEL                    
                                                                                
              Station  : Lagos-A                   Latitude:  06 25.0N          
              Country  : Nigeria                  Longitude: 003 27.0E          
              JASL #   : 233A                 Time Meridian: 015E (GMT + 1 hour)
              GLOSS #  : 259      TOGA #: A032       NODC #: 10006301           
              Contributor  : National Oceanography Centre
                             Proudman Oceanographic Laboratory
                             6 Brownlow Street                    
                             Liverpool L69 3GP
                             United Kingdom                              
              Originator   : Nigerian Institute for Oceanographic and           
                             Marine Research                                    
                             Victoria Island, P. M. B. 12729, Lagos             
                             NIGERIA                                            
              Original Data: unconfirmed                                        
              Instrmnt Type: unconfirmed                                        
              Digitzd Intvl: unconfirmed                                        
              Present Data : Hourly, daily, and monthly values obtained by:     
                    Hourly : unconfirmed                                        
                    Daily  : 119-point convolution filter (Bloomfield, 1976)    
                             centered on noon applied to the hourly data        
                             with respective periods of the 95, 50, and 5%      
                             amplitude points at 124.0, 60.2, and 40.2 hours    
                    Monthly: Simple average of all daily values; calculated if  
                             7 or fewer days are missing                        
              Span of data : 25 May 1961 - 17 Dec 1970                          
              Gaps > 1 mon : 20 Nov 1961 - 29 Dec 1961;01 Aug 1962 - 04 Jan 1963
                             04 Dec 1963 - 22 Jun 1964;11 Aug 1964 - 31 Dec 1964
                             16 Jul 1965 - 06 May 1966;30 Sep 1966 - 02 Dec 1966
                             02 Aug 1968 - 03 Sep 1968;25 Oct 1968 - 12 Dec 1968
                             27 Sep 1969 - 19 Feb 1970                          
              Time Refernce: GMT (00-23 hours)   Space-filler Flag   :-9999     
              Units        : millimeters         Missing Data Flag   : 9999     
              Existing     : Yes                 Operational         : Yes      
              Sat. Trans.  : No                  Distribution        : 1961-1969
              Refernce Levl: It is assumed that the data have been linked to    
                             tide staff zero and fixed bench marks by the       
                             originators.                                       
              Comment      : The  daily and monthly means look reasonable with  
                             no obvious shifts or trends except for the segment 
                             after the gap in 1970 when the reference level     
                             is suspiciously low.  The hourly residuals contain 
                             a large amount of questionable fluctuations due to 
                             complex tides that were not resolved by the tidal  
                             analysis; thus, the timing uncertainty is not      
                             clear.  In 1970, the tidal range is different than 
                             the previous years; this year will not be made     
                             available for international distribution due to    
                             th high uncertainty in the data.                   
                                                                                
                    CI MISSING              REPLACED GAPS     QUESTIONABLE      
              YEAR (%) DATA                 OR BAD DATA       FLUCTUATIONS      
              ---- --- -------------------- --------------- --------------------
              1961  50 324-363              none            see comment above   
              1962  56 26-32,213-365        none            see comment above   
              1963  86 1-4,115-117,         (13)261-(23)261 see comment above   
                       195-204,275-290,                                         
                       338-365                                                  
              1964  13 1-174,223-366        none            see comment above   
              1965  51 156-163,197-365      none            see comment above   
              1966  48 1-126,273-336        none            see comment above   
              1967  88 158-160,211-215,     (23)088-(22)089 see comment above   
                       272-281,305-334,                                         
                       364-365                                                  
              1968  75 1-4,180-187,         none            see comment above   
                       215-247,298-346                                          
              1969  65 34-39,94-98,         (12)059-(22)059 see comment above   
                       135-156,214-216,                                         
                       270-365                                                  
              1970  76 1-50,131-145,        none            see comment above   
                       234-243,351-365