QUALITY ASSESSMENT OF SEA LEVEL DATA                
                                           by the                               
                   UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER     
                                 JOINT ARCHIVE FOR SEA LEVEL                    
                                       updated: 20 May 2011
              Station  : Dumont d'Urville          Latitude:  66 39.7S
              Country  : France                   Longitude: 140 00.6E
              JASL #   : 189A                 Time Meridian: 135E (GMT + 9 hr)
              GLOSS #  : 131  Originator #:          NODC #: 36146001
              Contributor  : Service d'Observation ROSAME, LEGOS/OMP
                             14 Ave. Edouard Belin
                             31400 Toulouse
                             FRANCE
              Originator   : same
              Original Data: digital
              Instrmnt Type: Mors (bottom-mounted pressure gauge).
                             The gauge is a MORS automatic tide gauge station
                             which activates every half hour with measurements
                             of atmospheric pressure and air temperature with
                             a Mors sensor and bottom pressure and sea water
                             temperture with  an immersed Mors sensor, which
                             consists of a ventilated ParoScientific
                             pressure sensor at the base of a stilling well
                             which is used to filter waves.  The ventilation
                             of the sensor results in a measurement of the
                             total pressure (atmosphere + ocean) minus the
                             atmosphere; hence, a direct measure of sea level,
                             assuming water density is properly estimated.
                             These data have not been corrected for the
                             inverted barometer effect.
              Digitzd Intvl: 30 minutes
              Present Data : Hourly, daily, and monthly values obtained by:
                    Hourly : Four minute integration time is used for the
                             bottom pressure measurement.  Data are recorded
                             on the in-board memory every 30 minutes.  Data
                             are transmitted via ARGOSS every 30 minutes to
                             Toulouse.  The data are then processed to decrypt
                             the messages and compute sea level based on 
                             i) relative bottom pressure, ii) water temperature,
                             and iii) barometric pressure.  From this set of
                             data in combination with salinity, which is
                             periodically measured but is assumed to be constant
                             over extended periods, one computes water density
                             based on the UNESCO formula for the sea-water 
                             equation; thus, the sea level is deduced and an
                             hourly sub-sample is extracted.  
                    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 : 16 Jan 2008 - 19 Aug 2010
              Gaps > 1 mon : 11 Jun 2010 - 12 Aug 2010
              Time Refernce: GMT (00-23 hours)   Space-filler Flag   :-9999     
              Units        : millimeters         Missing Data Flag   : 9999     
              Existing     : Yes                 Operational         : Yes
              Sat. Trans.  : Yes                 Distribution        : 2008-2010
              Refernce Levl: Presently no link is established between the
                             tide gauge and fixed bench marks.  Please refer
                             to the originator for the up-to-date status.
              Comment      :    The plot of the hourly data minus the
                             predicted tides reveals data with excellent
                             timing characteristics and no obviously
                             erroneous data.
                              
                    CI MISSING              REPLACED GAPS     QUESTIONABLE      
              YEAR (%) DATA                 OR BAD DATA       FLUCTUATIONS      
              ---- --- -------------------- --------------- --------------------
              2008  96 none                 none            none
              2009 100 none                 none            none
              2010  46 162-224,226-229      none            none