QUALITY ASSESSMENT OF SEA LEVEL DATA                
                                           by the                               
                   UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER     
                                 JOINT ARCHIVE FOR SEA LEVEL                    
                                                                                
              Station  : San Carlos                Latitude:  24 47.4N
              Country  : Mexico                   Longitude: 112 07.2W
              JASL #   : 674A                 Time Meridian: 105W (GMT - 7 hr)
              GLOSS #  : none     TOGA #: none       NODC #: 72114201
              Contributor  : Servicio Mareografico Nacional                     
                             Instituto de Geofisica                             
                             Universidad Nacional Autonoma de Mexico            
                             04510 Mexico, D. F.                                
                             MEXICO                                             
              Originator   : same                                               
              Original Data: analog                                             
              Instrmnt Type: standard gauge with float and stilling well        
              Digitzd Intvl: hourly to tenths of feet                           
              Present Data : Hourly, daily, and monthly values obtained by:     
                    Hourly : spot sample on the hour from the analog roll       
                    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 : 01 Oct 1968 - 01 May 1983
              Gaps > 1 mon : 02 Dec 1968 - 03 Feb 1969;01 Mar 1969 - 01 Apr 1970
                             17 Feb 1971 - 01 May 1972;01 Jan 1973 - 01 Apr 1973
                             01 Oct 1973 - 01 Jan 1974;01 Jan 1977 - 01 Feb 1981
              Time Refernce: GMT (hours 00-23)   Space-filler Flag   :-9999     
              Units        : millimeters         Missing Data Flag   : 9999     
              Existing     : Yes                 Operational         : Yes      
              Sat. Trans.  : No                  Distribution        : 1968-1983
              Refernce Levl: The data are referred to tide staff zero which is  
                             linked to fixed bench marks.  
              Comment      : The daily and monthly values do not reveal any     
                             obvious reference level shifts or trends and       
                             agree fairly well with Ensenada and Cabo San
                             Lucas.  The timing is poor for most of the record
                             and only extreme timing errors are noted below.
                                                                                
                    CI MISSING              REPLACED GAPS     QUESTIONABLE      
              YEAR (%) DATA                 OR BAD DATA       FLUCTUATIONS      
              ---- --- -------------------- --------------- --------------------
              1968  17 337-366              none            none
              1969   7 1-34,60-365          none            none
              1970  75 1-91                 (06)228-(13)228 none
                                            (18)305-(08)306
                                            (10)364-(17)364
              1971  13 48-365               none            none
              1972  67 1-122                none            161,190-196,219,233-
                                                            246,263-276
              1973  50 1-91,274-365         (06)224-(15)224 91-112,164-183,212-
                                                            213,217-219,235,282
              1974  99 1                    none            none
              1975 100 none                 (00)048-(07)048 27,54-56
                                            (12)278-(19)278
                                            (19)297-(10)298
              1976  99 1                    none            164-165,180-181
              1977   0 1-365                none            none
              1978   0 1-365                none            none
              1979   0 1-365                none            none
              1980   0 1-366                none            none
              1981  91 1-33                 none            none
              1982  92 335-365              (23)087-(06)088 8-12
                                            (04)143-(11)143
                                            (10)309-(19)309
              1983  33 1                    none            none