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 : Lusi-A Latitude: 32 08.0N Country : China Longitude: 121 37.0E JASL # : 633A Time Meridian: 120E (GMT + 8 hr) GLOSS # : 283 Originator-#: 32020 NODC #: 13122101 Contributor : PRC National Oceanographic Data Center 118, Qiwei Road, Hedong District Tianjin, China Originator : same Original Data: analog Instrmnt Type: float and well; HCJ1 (1975-1990) SCA4-1 (1991-) Digitzd Intvl: hourly 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 1975 - 31 Oct 1996 Gaps > 1 mon : 01 Feb 1988 - 31 May 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 : 1975-1996 Refernce Levl: The sea level heights are referred to the zero point assigned to the tide gauge. 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. Obviously bad timing (about .5 hour slow) from September 1993 through the end of 1994. CI MISSING REPLACED GAPS QUESTIONABLE YEAR (%) DATA OR BAD DATA FLUCTUATIONS ---- --- -------------------- --------------- -------------------- 1975 100 none none see comment above 1976 100 none none see comment above 1977 99 253-254 (06)225-(21)225 see comment above 1978 100 none none see comment above 1979 100 none none 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 none see comment above 1984 100 none none see comment above 1985 100 none (17)230-(04)231 see comment above 1986 99 262-264 (15)360-(23)360 see comment above 1987 100 none none see comment above 1988 67 31-152 none see comment above 1989 100 none (13)261-(23)261 see comment above 1990 100 none none see comment above 1991 99 33-35 none see comment above 1992 99 138-143 (01)123-(11)123 see comment above 1993 96 142-144,235-246 (09)228-(21)228 see comment above 1994 100 none none see comment above 1995 100 none (18)193-(03)194 see comment above (08)271-(06)272 (13)286-(06)287 (16)309-(15)310 (16)314-(15)315 1996 75 39-41,54-56,77-85, (16)243-(15)244 see comment above 153-170,230-232