QUALITY ASSESSMENT OF SEA LEVEL DATA by the UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER JOINT ARCHIVE FOR SEA LEVEL updated: 14 Jul 2000 Station : Maisaka Latitude: 34 41.0N Country : Japan Longitude: 137 37.0E JASL # : 356A Time Meridian: 135E (GMT + 9 hr) GLOSS # : none TOGA #: none NODC #: 13134701 Contributor : Japan Meteorological Agency 1-3-4 Otemachi, Chiyoda-ku Tokyo, Japan Originator : Japan Meteorological Agency Original Data: analog Instrmnt Type: FUESS (1968-1972), LFT-4 (1973-1988), LFT-3 (1989-1990+) Digitzd Intvl: hourly Present Data : Hourly, daily, and monthly values obtained by: Hourly : hourly spot reading 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 1968 - 30 Apr 2000 Gaps > 1 mon : 18 Nov 1970 - 24 Dec 1970;24 Dec 1976 - 31 Dec 1977 Time Refernce: GMT (hours 00-23) Space-filler Flag :-9999 Units : millimeters Missing Data Flag : 9999 Existing : Yes Operational : Yes Sat. Trans. : No Distribution : 1968-2000 Refernce Levl: All data are levelled to fixed bench marks and the tide staff zero. From information provided by the originators, 2000 mm was added to each data value of the original data from 1968-1981. Comment : The daily or monthly means do not reveal any obvious reference level shifts. Most questionable fluctuations are related to atmospheric or oceanographic events. CI MISSING REPLACED GAPS QUESTIONABLE YEAR (%) DATA OR BAD DATA FLUCTUATIONS ---- --- -------------------- --------------- -------------------- 1968 100 none none 187-188,209,217-218, 251,266,293,323,328, 341,343-346,352-359 1969 99 315-319 none 5,8,14,16-17,20,29, 31-32,35-38,44,46- 50,64-65,67-68,74, 91-92,94,176-177, 180-181,185,234-235, 254-255,283-284 1970 88 86-89,308-311, (11)286-(08)287 5,30-31,113-114,199- 313-315,322-358 200,213 1971 97 193-203 none 188,242-243 1972 100 none (13)260-(04)261 11,44,107,196-197, 206 1973 96 187-201 none 2-5,106-107 1974 100 none none 188,237-238,242-243 1975 100 none none 22,234-235,278,280 1976 90 96-125,359-366 (15)291-(07)292 47,192-193,252-253 (15)358-(14)359 1977 1 1-365 none none 1978 97 128-135,187-189, none 258-259,274 190-191 1979 100 none none 83,89,98,292 1980 99 32-37 none 255-299 1981 99 328-329 none 109-110,173-174,234, 274,281,295 1982 100 none (15)207-(23)207 213-215,254-255,281, 333-334 1983 100 none none 164,228-229,271 1984 100 none none none 1985 100 none none 181-182 1986 100 none none 352 1987 100 none none 289-290 1988 100 none none 71-72,104,269-270 1989 100 none none none 1990 100 none none none 1991 100 none none none 1992 100 none (09)130-(00)131 none 1993 100 none none none 1994 100 none none none 1995 100 none none none 1996 100 none none none 1997 99 104-106 none none 1998 100 none none none 1999 99 231-236 none none 2000 33 none none none