Hakodate (Japan) Site History

History Summary

Station name Hakodate
Latitude 41° 47.0' N
Country Japan
Longitude 140° 44.0' E
GLOSS No. 88
Time Reference GMT (00-23 hours)
Contributor 1967-2009 Japan Meteorological Agency
Instrument type Float and stilling well gauge
Fuess float operated gauge (2001-2005)
Acoustic gauge (2006-2009)
Site of Gauge  
Observational periods 1967 - present

Benchmarks

Reference Level

All data are referred to Tide Gauge Zero (TGZ) and linked into historic fixed benchmarks.

Tide Gauge Benchmark (TGBM) Description

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

Auxiliary Benchmarks

Tide station Benchmark 2.1106m above Tokyo Peil (TP) (1984)

Benchmark Relationships

Year Standard Mark (TGBM)
above Datum Line (TGZ)
Standard Mark (TGBM)
above Tokyo Peil (TP)
TGZ below TP
1976-2000 3.606 2.202 -1.404
2001-2002 3.606 2.172 -1.434
2003-2009 3.606 2.049 -1.557

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.

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
1967 81.4 95.6 1967-03-09 15:00 to 1967-12-31 14:00 60 None 5040-5356 ASLVZZ01
1969 98.3 97.4 1968-12-31 15:00 to 1969-12-31 14:00 60 1028-1046, 2129-2147, 2862-2867, 7107-7114, 8035-8127 3158-3380 ASLVZZ01
1970 97.9 100.0 1969-12-31 15:00 to 1970-12-31 14:00 60 1112-1115, 4405-4432, 6856-6870, 7606-7620, 8456-8470, 8567-8675 None ASLVZZ01
1971 97.7 100.0 1970-12-31 15:00 to 1971-12-31 14:00 60 3064-3202, 6938-6971, 8080, 8089-8098, 8320-8340 None ASLVZZ01
1972 100.0 100.0 1971-12-31 15:00 to 1972-12-31 14:00 60 None None ASLVZZ01
1973 100.0 100.0 1972-12-31 15:00 to 1973-12-31 14:00 60 None None ASLVZZ01
1974 99.9 100.0 1973-12-31 15:00 to 1974-12-31 14:00 60 3454-3466 None ASLVZZ01
1975 100.0 100.0 1974-12-31 15:00 to 1975-12-31 14:00 60 None None ASLVZZ01
1976 77.6 100.0 1975-12-31 15:00 to 1976-12-31 14:00 60 5147-7116 None ASLVZZ01
1977 99.9 100.0 1976-12-31 15:00 to 1977-12-31 14:00 60 5507-5513 None ASLVZZ01
1978 100.0 100.0 1977-12-31 15:00 to 1978-12-31 14:00 60 None None ASLVZZ01
1979 99.6 100.0 1978-12-31 15:00 to 1979-12-31 14:00 60 6894-6926 None ASLVZZ01
1980 100.0 100.0 1979-12-31 15:00 to 1980-12-31 14:00 60 None None ASLVZZ01
1981 98.6 100.0 1980-12-31 15:00 to 1981-12-31 14:00 60 3178-3303 None ASLVZZ01
1982 99.9 100.0 1981-12-31 15:00 to 1982-12-31 14:00 60 947-951, 7551-7553 None ASLVZZ01
1983 100.0 100.0 1982-12-31 15:00 to 1983-12-31 14:00 60 None None ASLVZZ01
1984 100.0 100.0 1983-12-31 15:00 to 1984-12-31 14:00 60 None None ASLVZZ01
1985 100.0 100.0 1984-12-31 15:00 to 1985-12-31 14:00 60 None None ASLVZZ01
1986 100.0 100.0 1985-12-31 15:00 to 1986-12-31 14:00 60 None None ASLVZZ01
1987 100.0 100.0 1986-12-31 15:00 to 1987-12-31 14:00 60 None None ASLVZZ01
1988 99.9 100.0 1987-12-31 15:00 to 1988-12-31 14:00 60 4043-4049 None ASLVZZ01
1989 100.0 100.0 1988-12-31 15:00 to 1989-12-31 14:00 60 None None ASLVZZ01
1990 100.0 100.0 1989-12-31 15:00 to 1990-12-31 14:00 60 None None ASLVZZ01
1991 100.0 100.0 1990-12-31 15:00 to 1991-12-31 14:00 60 None None ASLVZZ01
1992 100.0 100.0 1991-12-31 15:00 to 1992-12-31 14:00 60 None None ASLVZZ01
1993 100.0 100.0 1992-12-31 15:00 to 1993-12-31 14:00 60 None None ASLVZZ01
1994 100.0 100.0 1993-12-31 15:00 to 1994-12-31 14:00 60 None None ASLVZZ01
1995 100.0 100.0 1994-12-31 15:00 to 1995-12-31 14:00 60 None None ASLVZZ01
1996 100.0 99.1 1995-12-31 15:00 to 1996-12-31 14:00 60 None 1-16, 61-88, 8142-8178 ASLVZZ01
1997 100.0 100.0 1996-12-31 15:00 to 1997-12-31 14:00 60 None None ASLVZZ01
1998 32.8 100.0 1998-01-01 00:00 to 1998-04-30 14:00 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 100.0 100.0 2001-12-31 15:00 to 2002-12-31 14:00 60 None None ASLVZZ01
2003 99.9 100.0 2002-12-31 15:00 to 2003-12-31 14:00 60 5845-5849 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 100.0 100.0 2005-12-31 15:00 to 2006-12-31 14:00 60 None None ASLVZZ01
2007 100.0 100.0 2006-12-31 15:00 to 2007-12-31 14:00 60 None 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