QUALITY ASSESSMENT OF SEA LEVEL DATA by the UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER JOINT ARCHIVE FOR SEA LEVEL updated: 16 Mar 2000 Station : Xiamen Latitude: 24 27.0N Country : China Longitude: 118 04.0E JASL # : 376A Time Meridian: 120E (GMT + 8 hr) GLOSS # : 247 Originator-#: 35041 NODC #: 12114801 Contributor : PRC National Oceanographic Data Center 118, Qiwei Road, Hedong District Tianjin, China Originator : same Original Data: analog Instrmnt Type: Gauge rods (1954-1964); HCJ1, float gauge (1965-1990) and SCA1-2 (1990-) Digitzd Intvl: hourly Present Data : Hourly, daily, and monthly values obtained by: Hourly : originally 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 1954 - 31 Dec 1997 Gaps > 1 mon : 31 Dec 1987 - 31 Jan 1988 Time Refernce: GMT (hours 00-23) Space-filler Flag :-9999 Units : millimeters Missing Data Flag : 9999 Existing : Yes Operational : Yes Sat. Trans. : No Distribution : 1954-1997 Refernce Levl: The sea level heights are referred to the Tide Gauge Zero (TGZ) of January 1976, which is 8.788m below TGBM-72831. For the original hourly data, 380 cm was added for the period 1/Jan/1954- (07Z)11/Nov/1957. Bench mark information is available upon request from the contributors. Comment : The residual series are very noisy which are probably due to shallow water tides that are not resolved by the harmonic analysis. Also the daily plot shows noise due to a great amount of energy with periods from 1 to 5 days. The monthly plot reveals a consistent annual and semi-annual harmonic and the 12-month running mean is steady. This data set is of good quality. CI MISSING REPLACED GAPS QUESTIONABLE YEAR (%) DATA OR BAD DATA FLUCTUATIONS ---- --- -------------------- --------------- -------------------- 1954 100 none none see comment above 1955 100 none none see comment above 1956 100 none none see comment above 1957 100 none none see comment above 1958 100 none none see comment above 1959 100 none none see comment above 1960 100 none none see comment above 1961 100 none none see comment above 1962 100 none none see comment above 1963 100 none none see comment above 1964 100 none none see comment above 1965 100 none none see comment above 1966 100 none none see comment above 1967 100 none none see comment above 1968 100 none none see comment above 1969 100 none none see comment above 1970 100 none none see comment above 1971 100 none none see comment above 1972 100 none none see comment above 1973 100 none none see comment above 1974 100 none none see comment above 1975 100 none none see comment above 1976 100 none none see comment above 1977 100 none none see comment above 1978 100 none none see comment above 1979 100 none (16)044-(22)044 see comment above 1980 100 none none see comment above 1981 100 none none see comment above 1982 100 none none see comment above 1983 100 none (15)283-(22)283 see comment above 1984 100 none none see comment above 1985 100 none none see comment above 1986 100 none none see comment above 1987 99 365 none see comment above 1988 92 1-31 none see comment above 1989 100 none none see comment above 1990 100 none none see comment above 1991 100 none none see comment above 1992 100 none none see comment above 1993 100 none none see comment above 1994 100 none none see comment above 1995 100 none none see comment above 1996 100 none none see comment above 1997 99 365 none see comment above