QUALITY ASSESSMENT OF SEA LEVEL DATA                
                                           by the                               
                   UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER     
                                 JOINT ARCHIVE FOR SEA LEVEL                    
                                       updated: 27 Sep 2001
              Station  : Halifax                   Latitude:  44 40.0N
              Country  : Canada                   Longitude: 063 35.0W
              JASL #   : 275A                 Time Meridian: 060W (GMT - 4 hr) 
              GLOSS #  : 222  Originator-#: 00490    NODC #: 74064301
              Contributor  : Marine Environmental Data Service
                             Dept. of Fisheries and Oceans
                             S12082-200 Kent St.
                             Ottawa, Ontario
                             CANADA K1A-OE6
              Originator   : Dept. of Fisheries
                             Atlantic Tidal Section
                             BIO, P.O. Box 1006
                             Dartmouth, N.S.
                             CANADA B2Y 4A2
              Original Data: analog (OTT); digital (TATS)
              Instrmnt Type: OTT float/well gauge; tidal acquisition 
                             telemetry system (TATS)
              Digitzd Intvl: hourly (OTT); 15 min (TATS)
              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 1920 - 31 Dec 2000
              Gaps > 1 mon : 05 Jun 1990 - 17 Jul 1990;07 Jun 1993 - 30 Jul 1993
              Time Refernce: GMT (hours 00-23)   Space-filler Flag   :-9999     
              Units        : millimeters         Missing Data Flag   : 9999     
              Existing     : Yes                 Operational         : Yes      
              Sat. Trans.  : Yes                 Distribution        : 1920-2000
              Refernce Levl: All heights have been referred to the station tide 
                             staff zero which is linked to fixed benchmarks.
                             The primary benchmark is a bronze tablet (stamped
                             T.S.1.1953) set horizontally in the S face of the
                             south bridge caisson, 0.20m above granite sill 
                             and 15m north of gauge house.
              Comment      : The hourly residuals show minor fluctuations
                             within the tidal frequency band.  It is not clear
                             whether this is due to the inability of the
                             tidal analysis to resolve the complex nature
                             of the tides or errors in the timing of the
                             instrument.  Only extreme fluctuations are noted
                             below.  
                                                                                
                    CI MISSING              REPLACED GAPS     QUESTIONABLE      
              YEAR (%) DATA                 OR BAD DATA       FLUCTUATIONS      
              ---- --- -------------------- --------------- --------------------
              1920  99 1                    none            none
              1921 100 none                 none            none
              1922 100 none                 none            none
              1923 100 none                 none            117
              1924 100 none                 none            239
              1925 100 none                 none            119-120,222-223,342,
                                                            344
              1926 100 none                 none            211-213,219,358-359
              1927 100 none                 none            12,237
              1928 100 none                 none            none
              1929 100 none                 none            none
              1930 100 none                 none            none
              1931 100 none                 (17)154-(03)155 none
              1932 100 none                 none            none
              1933 100 none                 none            216,276,346-349
              1934 100 none                 none            63-64
              1935 100 none                 none            7
              1936 100 none                 none            269
              1937 100 none                 none            none
              1938 100 none                 none            330-332
              1939 100 none                 none            191-198
              1940 100 none                 none            none
              1941 100 none                 none            none
              1942 100 none                 none            none
              1943 100 none                 none            none
              1944 100 none                 none            none
              1945 100 none                 none            none
              1946 100 none                 none            239-241,309,311
              1947 100 none                 none            none
              1948 100 none                 none            none
              1949 100 none                 none            217
              1950 100 none                 none            79,87,232
              1951 100 none                 none            none
              1952 100 none                 none            none
              1953 100 none                 none            140,249
              1954 100 none                 none            none
              1955 100 none                 none            none
              1956 100 none                 none            none
              1957 100 none                 none            none
              1958 100 none                 none            164-166
              1959 100 none                 none            none
              1960 100 none                 none            131
              1961 100 none                 none            227-228
              1962  98 109-115,265-267      none            none
              1963 100 none                 none            185-186,302-303
              1964 100 none                 none            none
              1965 100 none                 none            none
              1966 100 none                 none            none
              1967 100 none                 none            192-213
              1968 100 none                 (05)244-(04)245 none
              1969 100 none                 none            none
              1970 100 none                 none            244-263,345-348,
                                                            358-361
              1971 100 none                 none            none
              1972 100 none                 none            none
              1973 100 none                 none            none
              1974 100 none                 none            none
              1975  99 56-60                none            209
              1976  99 156-160              (17)051-(01)052 61-62
                                            (05)052-(13)052
                                            (16)096-(14)097
                                            (14)214-(12)215
              1977  96 18-19,24-25,163-164, (03)007-(13)007 17,29
                       168-174,307-313
              1978  99 132-135              (05)091-(13)091 none
              1979  97 158-162,182-185,197- none            91-92
                       201,305-306
              1980  88 183-188,194-196,207- (16)245-(04)246 188-199,214-217,
                       209,222-242,275-288                  243-244,246
              1981  99 249-252              (01)308-(12)308 255,274-275
              1982  98 1-7                  none            none
              1983  99 305-306,321-324      none            none
              1984 100 none                 none            none
              1985  99 80-81                (05)091-(16)091 none
              1986 100 none                 none            none
              1987 100 none                 none            none
              1988 100 none                 none            184-185
              1989  97 222-233              none            234
              1990  88 156-198              none            none
              1991  91 121-134,247-267      none            none
              1992  95 216-217,231-243      none            92-133
                       246-252
              1993  86 158-211              none            none
              1994  99 273-278              none            none
              1995 100 none                 none            none
              1996 100 none                 none            none
              1997 100 none                 none            none
              1998 100 none                 (16)357-(00)358 none
              1999 100 none                 none            none
              2000  97 130-140,243-245      (21)359-(04)360 228-366 
                                            (22)361-(04)362