Naha (Japan) Site History

History Summary

Station Name Naha
Country Japan
Latitude 26° 13.0' N
Longitude 127° 40.0' E
GLOSS No. 081
Contributor 1966-1986 TOGA Sea Level Center,
1987-2009 Japan Meteorological Agency.
Instrument Type FUESS (1966-1972)
LFT-4 (1973-1999)
Fuess float operated gauge (2001-2005)
Acoustic Doppler Gauge (2006-2009)
Site of Gauge  
Observational Period 1966 - present

Benchmarks

Reference Level

All heights have been referred to the station Tide Gauge Zero (TGZ) 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 6.2624m above Okinawa height standard (1989).

Benchmark Relationships

Year Standard Mark (TGBM)
above Datum Line (TGZ)
Standard Mark (TGBM)
above Tokyo Peil (TP)
TGZ below TP
1966-2001 5.500 n/a n/a
2001-2002 5.453 2.870 -2.583
2003-2008 5.453 2.873 -2.580
2009 5.453 2.878 -2.575

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
1966 42.0 100.0 1966-07-31 15:00 to 1966-12-31 23:00 60 None None ASLVZZ01
1967 100.0 93.6 1967-01-01 00:00 to 1967-12-31 23:00 60 None 642-837,961-1064,1215-1475,7389 ASLVZZ01
1968 100.0 100.0 1968-01-01 00:00 to 1968-12-31 23:00 60 None None ASLVZZ01
1969 100.0 100.0 1969-01-01 00:00 to 1969-12-31 23:00 60 None None ASLVZZ01
1970 100.0 99.8 1970-01-01 00:00 to 1970-12-31 23:00 60 None 745 ASLVZZ01
1971 100.0 94.9 1971-01-01 00:00 to 1971-12-31 23:00 60 None 6587-6716,7966-8168,8418-8534 ASLVZZ01
1972 99.0 95.8 1972-01-01 00:00 to 1972-12-31 23:00 60 2505-2595 2018-2233,2359-2504,3482 ASLVZZ01
1973 100.0 84.4 1973-01-01 00:00 to 1973-12-31 23:00 60 None 5629-5926,6001-6288,6344-6598,6685-6944,8493-8760 ASLVZZ01
1974 99.3 94.1 1974-01-01 00:00 to 1974-12-31 23:00 60 6933-6994 118-322,466-656,5434-5551 ASLVZZ01
1975 99.4 95.7 1975-01-01 00:00 to 1975-12-31 23:00 60 3126-3174 2641-2858,3021-3125,3175-3224 ASLVZZ01
1976 100.0 100.0 1976-01-01 00:00 to 1976-12-31 23:00 60 None None ASLVZZ01
1977 97.7 98.8 1977-01-01 00:00 to 1977-12-31 23:00 60 3256-3459 3156-3255 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 100.0 100.0 1980-01-01 00:00 to 1980-12-31 23:00 60 None 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
1983 100.0 100.0 1983-01-01 00:00 to 1983-12-31 23:00 60 None None ASLVZZ01
1984 98.5 100.0 1984-12-31 00:00 to 1984-12-31 23:00 60 5177-5307 None ASLVZZ01
1985 100.0 100.0 1985-01-01 15:00 to 1985-12-31 23:00 60 None None ASLVZZ01
1986 97.9 84.4 1986-01-01 00:00 to 1986-12-31 14:00 60 4995-5168 3017-3206,3512-3580,3637-4540,4819-4994 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 8413-8418 None ASLVZZ01
1989 100.0 100.0 1988-12-31 15:00 to 1989-12-31 14:00 60 None None ASLVZZ01
1990 99.9 100.0 1989-12-31 15:00 to 1990-12-31 14:00 60 2053-2057,2078-2079 None ASLVZZ01
1991 100.0 99.8 1990-12-31 15:00 to 1991-12-31 14:00 60 None 6124-6134 ASLVZZ01
1992 100.0 99.8 1991-12-31 15:00 to 1992-12-31 14:00 60 None 4380 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 23:00 60 None None ASLVZZ01
1996 100.0 100.0 1995-12-31 15:00 to 1996-12-31 14:00 60 None None ASLVZZ01
1997 100.0 100.0 1996-12-31 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 100.0 100.0 2001-12-31 15:00 to 2002-12-31 14:00 60 None None ASLVZZ01
2003 100.0 100.0 2002-12-31 15:00 to 2003-12-31 14:00 60 None None ASLVZZ01
2004 99.7 100.0 2003-12-31 15:00 to 2004-12-31 14:00 60 3831-3859,3879 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 1403-1409 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 99.9 100.0 2008-12-31 15:00 to 2009-12-31 14:00 60 7907-7911 None ASLVZZ01

Replaced gaps

Year Replaced Gaps (UTC)
1966 1966-08-26 02:00 to 1966-08-26 12:00 and
1966-09-01 12:00 to 1966-09-01 21:00.
1969 1969-10-09 04:00 to 1969-10-09 12:00.
1973 1973-03-04 18:00 to 1973-03-05 01:00,
1973-06-03 09:00 to 1973-06-03 15:00 and
1973-09-27 07:00 to 1973-09-27 13:00.
1975 1975-10-08 18:00 to 1975-10-10 07:00 and
1975-12-23 03:00 to 1975-12-23 14:00.