QUALITY ASSESSMENT OF SEA LEVEL DATA                
                                           by the                               
                   UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER     
                                 JOINT ARCHIVE FOR SEA LEVEL                    
                                                                                
              Station  : Clipperton-A              Latitude:  10 16.8N
              Country  : France                   Longitude: 109 13.3W
              JASL #   : 391A                 Time Meridian: 105W (GMT - 7 hr)
              GLOSS #  : 165      TOGA #: P070       NODC #: 71100901
              Contributor  : NOAA/PMEL
                             7600 Sand Point Way NE
                             Seattle, WA 98115-0070
              Originator   : same                                               
              Original Data: unconfirmed
              Instrmnt Type: unconfirmed
              Digitzd Intvl: unconfirmed
              Present Data : Hourly, daily, and monthly values obtained by:     
                    Hourly : unconfirmed
                    Daily  : unconfirmed
                    Monthly: Simple average of all daily values; calculated if  
                             7 or fewer days are missing                        
              Span of data : 01 Jun 1985 - 17 Nov 1985
              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        : 1985-1985
              Refernce Levl: 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.
              Comment      : Although this data set is within the sea level
                             archive, the user must acknowledge that these
                             data represent inferred sea level from a sub-
                             surface pressure gauge, which measures the
                             combined weight of the column of water and air 
                             above it.  A constant atmospheric pressure has been
                             subtracted, but variations in atmospheric pressure,
                             which would not be sensed by a conventional float/
                             well gauge, would affect the measurement of the 
                             sub-surface pressure gauge.

                             The depth of the instrument in the water was
                             about 20 m.  Techniques of data processing
                             by the originator are unconfirmed.  Only daily 
                             data received at the UH Sea Level Center.

                             The short period variations appear reasonable
                             however there appears to be a negative trend.

                             Due to the tendency for pressure gauge sensors
                             to drift, it is beneficial for investigators
                             to know the time span of each instrument
                             deployment.  However, this information was
                             not supplied.  Thus it is assumed that the
                             time span above represents the span of a
                             single instrument deployment.
                                                                                
                    CI MISSING              REPLACED GAPS     QUESTIONABLE      
              YEAR (%) DATA                 OR BAD DATA       FLUCTUATIONS      
              ---- --- -------------------- --------------- --------------------
              1985  47 none                 none            none