Ofunato (Japan) Site History

History Summary

Station name Ofunato
Country Japan
Latitude 39° 01.0' N
Longitude 141° 45.0' E
GLOSS No. 087
Contributor 1965-1986 TOGA Sea Level Center
1987-2009 Japan Meteorological Agency
Instrument Type FUESS (1965-1972)
LFT-4 (1973-1999)
Fuess float operated gauge (2001-2005)
Acoustic gauge (2006-2009)
Site of Gauge  
Observational Periods 1965 - present

Benchmarks

Reference Level

All heights have been referred to the station Tide Gauge Zero which is linked to fixed bench marks.

Tide Gauge Benchmark (TGBM) Description

Japan Meteorlogical Agency Benchmark bolt inside tide gauge hut, adjacent to stilling well

Auxiliary Benchmarks

Tide Station BM 1.6294m above Tokyo Peil (1985).

Benchmark Relationships

Year Standard Mark (TGBM)
above Datum Line (TGZ)
Standard Mark (TGBM)
above Tokyo Peil (TP)
TGZ below TP
1973-2002 5.329 3.491 -1.838
2003-2006 5.329 3.344 -1.985
2007-2009 5.329 3.339 -1.990

Parameter Code

ASLVZZ01 - The elevation of the sea surface to a known datum, measured in metres.

Quality Assessment

The daily or monthly means do not reveal any obvious reference level shifts. Prior to 2001 most questionable fluctuations are related to timing problems with the gauge. Data spikes of about 10cm or less have not been corrected. In some years gaps in data have been replaced, details can be found in Replaced gaps table below.

Completeness index (CI)

Sea level data from Japan is processed for each year. Occasionally data is missing from the data sets, either because the data set does not cover the whole year or because data has been flagged null. The number of cycles in a year with no missing data is calculated (based on the sample interval and whether a leap year). The completeness index calculates what proportion of the data expected in a year is present and not flagged null.

Quality index (QI)

During processing cycles considered suspect within a series are flagged M. The quality index calculates what proportion of the data available is not considered suspect.

Yearly overview of data

Year CI (%) QI (%) Start and end date (UTC) Sampling interval
(minutes)
Missing Data
(cycle no.)
Suspect Data
(cycle no.)
Parameter Code
1965 96.9 95.9 1965-01-01 00:00 to 1965-12-31 23:00 60 2677-2715, 2746-2787, 7402-7467, 7561-7610, 8332-8403 3130-3290, 3522-3711 ASLVZZ01
1966 100.0 99.1 1966-01-01 00:00 to 1966-12-31 23:00 60 None 5762-5763, 6767-6847 ASLVZZ01
1967 100.0 100.0 1967-01-01 00:00 to 1967-12-31 23:00 60 None None ASLVZZ01
1968 99.0 98.6 1968-01-01 00:00 to 1968-12-31 23:00 60 2462-2550 318-441 ASLVZZ01
1969 98.8 100.0 1969-01-01 00:00 to 1969-12-31 23:00 60 5157-5262 None ASLVZZ01
1970 100.0 100.0 1970-01-01 00:00 to 1970-12-31 23:00 60 None None ASLVZZ01
1971 96.2 100.0 1971-01-01 00:00 to 1971-12-31 23:00 60 1516-1851 None ASLVZZ01
1972 100.0 100.0 1972-01-01 00:00 to 1972-12-31 23:00 60 None None ASLVZZ01
1973 100.0 99.8 1973-01-01 00:00 to 1973-12-31 23:00 60 None 1617, 3530 ASLVZZ01
1974 100.0 100.0 1974-01-01 00:00 to 1974-12-31 23:00 60 None None ASLVZZ01
1975 100.0 100.0 1975-01-01 00:00 to 1975-12-31 23:00 60 None None ASLVZZ01
1976 100.0 100.0 1976-01-01 00:00 to 1976-12-31 23:00 60 None None ASLVZZ01
1977 100.0 100.0 1977-01-01 00:00 to 1977-12-31 23:00 60 None None ASLVZZ01
1978 100.0 100.0 1978-01-01 00:00 to 1978-12-31 23:00 60 None None ASLVZZ01
1979 100.0 100.0 1979-01-01 00:00 to 1979-12-31 23:00 60 None None ASLVZZ01
1980 98.7 100.0 1980-01-01 00:00 to 1980-12-31 23:00 60 5838-5954 None ASLVZZ01
1981 100.0 100.0 1981-01-01 00:00 to 1981-12-31 23:00 60 None None ASLVZZ01
1982 100.0 100.0 1982-01-01 00:00 to 1982-12-31 23:00 60 None None ASLVZZ01
1982 100.0 100.0 1983-01-01 00:00 to 1983-12-31 23:00 60 None None ASLVZZ01
1983 100.0 100.0 1983-01-01 00:00 to 1983-12-31 23:00 60 None None ASLVZZ01
1984 100.0 100.0 1984-01-01 00:00 to 1984-12-31 23:00 60 None None ASLVZZ01
1985 100.0 100.0 1985-01-01 00:00 to 1985-12-31 23:00 60 None None ASLVZZ01
1986 99.9 100.0 1986-01-01 00:00 to 1986-12-31 14:00 60 None None ASLVZZ01
1987 100.0 100.0 1986-31-12 15:00 to 1987-12-31 14:00 60 None None ASLVZZ01
1988 100.0 100.0 1987-31-12 15:00 to 1988-12-31 14:00 60 None None ASLVZZ01
1989 100.0 100.0 1988-31-12 15:00 to 1989-12-31 14:00 60 None None ASLVZZ01
1990 100.0 100.0 1989-31-12 15:00 to 1990-12-31 14:00 60 None None ASLVZZ01
1991 100.0 100.0 1990-31-12 15:00 to 1991-12-31 14:00 60 None None ASLVZZ01
1992 100.0 100.0 1991-31-12 15:00 to 1992-12-31 14:00 60 None None ASLVZZ01
1993 100.0 100.0 1992-31-12 15:00 to 1993-12-31 14:00 60 None None ASLVZZ01
1994 100.0 100.0 1993-31-12 15:00 to 1994-12-31 14:00 60 None None ASLVZZ01
1995 99.9 100.0 1994-31-12 15:00 to 1995-12-31 14:00 60 1716-1717 None ASLVZZ01
1996 100.0 100.0 1995-31-12 15:00 to 1996-12-31 14:00 60 None None ASLVZZ01
1997 100.0 100.0 1996-31-12 15:00 to 1997-12-31 14:00 60 None None ASLVZZ01
1998 100.0 100.0 1998-01-01 00:00 to 1998-12-31 23:00 60 None None ASLVZZ01
1999 100.0 100.0 1999-01-01 00:00 to 1999-12-31 23:00 60 None None ASLVZZ01
2001 100.0 100.0 2000-12-31 15:00 to 2001-12-31 14:00 60 None None ASLVZZ01
2002 99.9 100.0 2001-12-31 15:00 to 2002-12-31 14:00 60 179-183 None ASLVZZ01
2003 100.0 100.0 2002-12-31 15:00 to 2003-12-31 14:00 60 179-183 None ASLVZZ01
2004 100.0 100.0 2003-12-31 15:00 to 2004-12-31 14:00 60 None None ASLVZZ01
2005 100.0 100.0 2004-12-31 15:00 to 2005-12-31 14:00 60 None None ASLVZZ01
2006 99.9 100.0 2005-12-31 15:00 to 2006-12-31 14:00 60 8457-8483, 8666-8675 None ASLVZZ01
2007 99.9 100.0 2006-12-31 15:00 to 2007-12-31 14:00 60 6975-6978 None ASLVZZ01
2008 100.0 100.0 2007-12-31 15:00 to 2008-12-31 14:00 60 None None ASLVZZ01
2009 100.0 100.0 2008-12-31 15:00 to 2009-12-31 14:00 60 None None ASLVZZ01

Replaced gaps

Year Replaced Gaps (UTC)
1965 1965-05-14 03:00 to 1965-05-15 01:00 and
1965-11-14 06:00 to 1965-11-15 01:00
1966 1966-10-06 06:00 to 1966-10-07 02:00
1968 1968-01-04 09:00 to 1968-01-05 03:00 and
1968-04-06 06:00 to 1968-04-07 04:00
1969 1969-10-16 19:00 to 1969-10-17 04:00
1982 1982-09-08 01:00 to 1982-09-08 07:00