QUALITY ASSESSMENT OF SEA LEVEL DATA                
                                           by the                               
                   UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER     
                                 JOINT ARCHIVE FOR SEA LEVEL                    
                                 updated: 17 Mar 2000
              Station  : Zhapo-A                   Latitude:  21 35.0N          
              Country  : China                    Longitude: 111 50.0E          
              JASL #   : 635A                 Time Meridian: 120E (GMT + 8 hr)  
              GLOSS #  : 078  Originator-#: 44107    NODC #: 12111101           
              Contributor  : PRC National Oceanographic Data Center             
                             118, Qiwei Road, Hedong                            
                             District Tianjin, China                            
              Originator   : same                                               
              Original Data: analog
              Instrmnt Type: float and well; HCJ1 (1975-85); SCA1-1 (1986-1994);
                             HCA1-1 (1995-)
              Digitzd Intvl: hourly
              Present Data : Hourly, daily, and monthly values obtained by:  
                    Hourly : spot hourly
                    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 Jan 1975 - 31 Dec 1997
              Gaps > 1 mon : none                                               
              Time Refernce: GMT (hours 00-23)   Space-filler Flag   :-9999     
              Units        : millimeters         Missing Data Flag   : 9999     
              Existing     : Yes                 Operational         : Yes
              Sat. Trans.  : No                  Distribution        : 1975-1997
              Refernce Levl: The sea level heights are referred to the zero     
                             point assigned to the tide gauge. Bench mark       
                             information is available upon request from the     
                             contributors.                                      
              Comment      : The data are of good quality.  Significant energy
                             occurs with 1-5 day periodicity.
                                                                                
                    CI MISSING              REPLACED GAPS     QUESTIONABLE      
              YEAR (%) DATA                 OR BAD DATA       FLUCTUATIONS      
              ---- --- -------------------- --------------- --------------------
              1975 100 none                 none            none                
              1976 100 none                 none            none                
              1977 100 none                 none            none                
              1978 100 none                 none            none                
              1979 100 none                 none            none                
              1980 100 none                 (15)309-(22)309 none
              1981 100 none                 (15)194-(22)194 none
              1982 100 none                 (13)034-(23)034 none
              1983 100 none                 none            none
              1984 100 none                 (13)044-(23)044 none
                                            (15)045-(22)045
              1985 100 none                 (14)303-(22)303 none
              1986 100 none                 none            none                
              1987 100 none                 none            none                
              1988 100 none                 none            none                
              1989 100 none                 none            none                
              1990 100 none                 none            none                
              1991 100 none                 none            none                
              1992 100 none                 none            none                
              1993 100 none                 none            none
              1994 100 none                 (16)056-(23)056 none
              1995 100 none                 none            none
              1996 100 none                 none            none
              1997  99 365                  none            none