QUALITY ASSESSMENT OF SEA LEVEL DATA by the UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER JOINT ARCHIVE FOR SEA LEVEL updated: 17 Mar 2000 Station : Haikou Latitude: 20 01.0N Country : China Longitude: 110 17.0E JASL # : 638A Time Meridian: 120E (GMT + 8 hr) GLOSS # : none Originator-#: 44140 NODC #: 12110001 Contributor : PRC National Oceanographic Data Center 118, Qiwei Road, Hedong District Tianjin, China Originator : same Original Data: analog Instrmnt Type: HCJ-1 Float gauge (1976-1985); SCA1-1 Float gauge (1986-) Digitzd Intvl: hourly Present Data : Hourly, daily, and monthly values obtained by: Hourly : digitized as hourly values 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 1976 - 31 Dec 1997 Gaps > 1 mon : none Time Refernce: GMT (hours 00-23) Space-filler Flag :-9999 Units : millimeters Missing Data Flag : 9999 Existing : Yes Operational : Yes Sat. Trans. : No Distribution : 1976-1997 Refernce Levl: The sea level heights are referred to the Tide Gauge Zero (TGZ) which is linked to fixed bench marks. 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. CI MISSING REPLACED GAPS QUESTIONABLE YEAR (%) DATA OR BAD DATA FLUCTUATIONS ---- --- -------------------- --------------- -------------------- 1976 100 none (16)198-(23)198 see comment above (15)203-(23)203 (15)204-(23)204 (15)292-(23)292 (15)301-(23)301 (03)354-(11)354 1977 100 none (15)059-(23)059 see comment above (15)061-(23)061 (15)063-(23)063 (13)067-(23)067 (01)305-(11)305 (15)318-(23)318 (16)319-(23)319 (04)363-(11)363 1978 100 none (01)065-(11)065 see comment above (04)072-(11)072 (01)328-(13)328 1979 99 272-273 (01)182-(12)182 see comment above (16)274-(23)274 1980 100 none (13)196-(23)196 see comment above 1981 100 none (01)292-(11)292 see comment above 1982 100 none (15)039-(23)039 see comment above (13)061-(23)061 (01)062-(11)062 (01)063-(11)063 (01)064-(11)064 (14)064-(23)064 (13)131-(23)131 1983 100 none (16)199-(23)199 see comment above 1984 100 none (16)061-(23)061 see comment above (16)061-(23)061 1985 100 none none see comment above 1986 100 none none see comment above 1987 100 none (14)332-(23)332 see comment above 1988 100 none none see comment above 1989 100 none (13)157-(23)157 see comment above 1990 100 none none see comment above 1991 100 none none see comment above 1992 100 none (01)180-(23)180 see comment above 1993 100 none (15)055-(23)055 see comment above (16)109-(23)109 (16)157-(23)157 (01)187-(11)187 (16)248-(23)248 1994 100 none (16)205-(23)205 see comment above 1995 100 none none see comment above 1996 99 264-270 (16)318-(23)318 see comment above 1997 99 365 none see comment above