QUALITY ASSESSMENT OF SEA LEVEL DATA                
                                           by the                               
                   UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER     
                                 JOINT ARCHIVE FOR SEA LEVEL                    
                                       Updated: 09 Feb 2011
              Station  : Sta. Cruz de la Palma-A   Latitude:  28 41.0N
              Country  : Spain                    Longitude: 017 45.0W          
              JASL #   : 206A                 Time Meridian: GMT                
              GLOSS #  : none     TOGA #: none       NODC #: 72018701           
              Contributor  : Instituto Espanol de Oceanografia                  
                             C/ Corazon de Maria, No. 8 - 1                     
                             28002 Madrid                                       
                             SPAIN                                              
              Originator   : same                                               
              Original Data: analog                                             
              Instrmnt Type: A.OTT, float and stilling well                     
              Digitzd Intvl: one hour                                           
              Present Data : Hourly, daily, and monthly values obtained by:     
                    Hourly : direct digitization, no filter                     
                    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 May 1949 - 02 Mar 1959
              Gaps > 1 mon : none
              Time Refernce: GMT (00-23 hours)   Space-filler Flag   :-9999     
              Units        : millimeters         Missing Data Flag   : 9999     
              Existing     : No                  Operational         : No
              Sat. Trans.  : No                  Distribution        : 1949-1959
              Refernce Levl: The data have been linked to tide staff zero       
                             and fixed bench marks by the originators.
                             Level shifts were identified in the series and
                             adjusted as follows:
                                                            value added         
                             period( day/month/year )       to original(mm)     
                             ------------------------       ---------------     
                             01/05/1949 - 20/07/1949              -250
                             26/02/1951 - 06/03/1951               -80
                             21/03/1955 - 26/03/1955              -500
                             22/12/1957 - 01/05/1958               150

                             These adjustments are uncertain to a few cm.
              Comment      : The timing of the data is fair except in 1955.
                             The level appears to jump on 30 Jan 1952;however,
                             based on comparisons with Las Palmas, the level
                             appears to resettle to the original mean level.
                             Since several level jumps were clearly identified,
                             it is unknown if others may exist.  The difference
                             with Las Palmas is not smooth.  Overall, the
                             quality of the reference level stability is
                             questionable.  This series is separate from Sta.
                             Cruz-B because of a sharp level jump on 02 Mar
                             1959.  Judging from the hourly residuals and 
                             daily plots, this jump is about 1050 mm.
                                There is poor agreement between the monthly
                             values and the same for data in the Permanent
                             Service for Mean Sea Level archive.  This
                             discrepancy is unclear.
                                                                                
                    CI MISSING              REPLACED GAPS     QUESTIONABLE      
              YEAR (%) DATA                 OR BAD DATA       FLUCTUATIONS      
              ---- --- -------------------- --------------- --------------------
              1949  67 none                 (20)200-(11)201 none
              1950 100 none                 (10)013-(20)013 34-35
                                            (09)042-(23)042
              1951 100 none                 (11)101-(21)101 350-352
                                            (01)335-(08)335
              1952 100 none                 none            none
              1953  99 93-97                (14)059-(23)059 265-294
              1954  98 299-304              (02)279-(00)280 335-340
              1955 100 none                 none            25-28,36-39,109-125,
                                                            139-143,156-158,348-
                                                            351,352-356
              1956 100 none                 none            1-14,161-165
              1957 100 none                 none            none
              1958 100 none                 (07)026-(14)026 none
                                            (07)120-(15)120
                                            (01)121-(08)121
                                            (12)131-(01)132
                                            (02)163-(09)163
                                            (02)166-(09)166
              1959  17 none                 (02)004-(19)004 none