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