QUALITY ASSESSMENT OF SEA LEVEL DATA by the UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER JOINT ARCHIVE FOR SEA LEVEL updated: 16 Oct 2003 Station : Mayport,FL Latitude: 30 23.7N Country : USA Longitude: 081 25.9W JASL # : 753A Time Meridian: 075W (GMT - 5 hr) GLOSS # : none Originator #:8720220 NODC #: 73080101 Contributor : National Ocean Service (NOS) National Ocean. and Atmos. Administration (NOAA) N/OES22 SSMC4, STATION 7109 1305 East West Highway Silver Spring, MD. 20910-3233 Originator : US Coastal Geodetic Survey (1928-1972); NOS (1973+) Original Data: analog (standard); digital (ADR and NGWLMS) Instrmnt Type: standard mechanical (1928-1974); analog-to-digital (ADR) recorder (1975-1990); Aquatrak acoustic gauge, NOAA Next Generation Water Level Measuring System (NGWLMS) (1991-) Digitzd Intvl: hourly (standard); six-minute (adr and NGWLMS) NGWLMS sampling is three-minute average Present Data : Hourly, daily, and monthly values obtained by: Hourly : The original digitizing interval was hourly (standard); spot sampling on the hour (adr/NGWLMS) 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 : 26 Apr 1928 - 30 Nov 2000 Gaps > 1 mon : 18 Aug 1938 - 26 Sep 1938;01 Jul 1943 - 12 Aug 1943 03 Oct 1990 - 05 Nov 1990 Time Refernce: GMT (hours 00-23) Space-filler Flag :-9999 Units : millimeters Missing Data Flag : 9999 Existing : Yes Operational : Yes Sat. Trans. : Yes Distribution : 1928-2000 Refernce Levl: All heights have been referred to the station tide staff zero which is linked to fixed bench marks. While standard mechanical or ADR instrument was the primary gauge, leveling calibration factors were applied monthly based on tide staff comparisons. Comment : The daily and monthly means reveal no apparent reference level changes or trends. CI MISSING REPLACED GAPS QUESTIONABLE YEAR (%) DATA OR BAD DATA FLUCTUATIONS ---- --- -------------------- --------------- -------------------- 1928 68 none none none 1929 100 none none none 1930 100 none none none 1931 100 none none 361 1932 100 none none none 1933 100 none none none 1934 100 none none none 1935 100 none none none 1936 100 none none 52-53,115 1937 100 none none none 1938 89 230-269 none none 1939 100 none none none 1940 100 none none none 1941 100 none none none 1942 100 none none none 1943 89 182-224 none none 1944 100 none none none 1945 96 174-189 none none 1946 100 none none none 1947 100 none none none 1948 100 none none none 1949 97 193-203 none none 1950 100 none none none 1951 100 none none none 1952 100 none none 133 1953 100 none none none 1954 100 none none 97,118,122 1955 100 none none none 1956 100 none none none 1957 100 none none none 1958 100 none none 235 1959 100 none none 352-353 1960 100 none none 24,234,251,255 1961 100 none none 207 1962 100 none (14)330-(11)331 none 1963 100 none none none 1964 100 none none 1,161-163 1965 100 none none 206-207 1966 100 none none none 1967 100 none none none 1968 100 none none none 1969 100 none none none 1970 100 none (20)153-(10)154 none (02)196-(10)196 1971 93 86-112 none none 1972 100 none (10)004-(17)004 none (23)073-(13)074 (12)115-(11)116 (20)328-(16)329 1973 89 15-19,43-51,274-304 (17)193-(00)194 150 1974 100 none none none 1975 100 none none none 1976 100 none none none 1977 100 none none 107-108 1978 100 none none none 1979 100 none (05)224-(04)225 none 1980 100 none (08)286-(20)286 none 1981 100 none none none 1982 100 none none none 1983 100 none none none 1984 100 none none none 1985 99 21-25 none none 1986 100 none none none 1987 100 none none none 1988 99 299-301 none none 1989 100 none none none 1990 91 276-309 none none 1991 100 none none none 1992 96 220-226,268-277 none none 1993 100 none none none 1994 100 none none none 1995 99 309-311 none none 1996 99 8-10,40-43 (15)040-(11)041 none (09)134-(20)134 1997 100 none none none 1998 99 69-72 none none 1999 99 287-291 (23)041-(16)042 none 2000 90 72-77,78-81 (02)077-(00)078 6-10 (02)078-(10)078 (13)226-(20)226