Ishigaki (Japan) Site History

History Summary

Station name Ishigaki
Latitude 24° 20.0' N
Country Japan
Longitude 124° 09.0' E
WOCE No. 9015
Time Reference GMT (00-23 hours)
Contributor 1975-2009 Japan Meteorological Agency
Instrument type Fuess Float and stilling well gauge (1975-2005)
Acoustic gauge (2006-2009)
Site of Gauge  
Observational periods 1975 - present
Reference level All data are referred to TGZ and linked into historic fixed benchmarks.

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.

Benchmark Relationships

Year Standard Mark (TGBM)
above Datum Line (TGZ)
Standard Mark (TGBM)
above Tokyo Peil (TP)
TGZ below TP
2001-2002 5.001 3.288 -1.713
2003-2006 5.001 3.292 -1.709
2007-2009 5.217 3.508 -1.709

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
1975 99.3 99.8 1974-12-31 15:00 to 1975-12-31 14:00 60 2220-2243, 8222-8242, 8420-8435 1064, 3528, 7124 ASLVZZ01
1976 99.6 99.8 1975-12-31 15:00 to 1976-12-31 14:00 60 6081-6083, 6212-6224, 7602-7619, 8546-8550 1202 ASLVZZ01
1977 99.9 99.9 1976-12-31 15:00 to 1977-12-31 14:00 60 2332-2334, 3049-3057 1962, 3626-3638, 5071-5072 ASLVZZ01
1978 99.3 99.8 1977-12-31 15:00 to 1978-12-31 14:00 60 5385-5386, 5400-5406, 7361-7379, 7750-7787, 8403-8410 1438, 3158, 3395, 4068, 4082 ASLVZZ01
1979 99.4 100.0 1978-12-31 15:00 to 1979-12-31 14:00 60 846-875, 948-950, 8351-8388 None ASLVZZ01
1980 99.2 99.8 1979-12-31 15:00 to 1980-12-31 14:00 60 2156-2171, 2719-2722, 4988-5002, 5141-5146, 5501-5506, 6908-6922, 7295-7306 5833 ASLVZZ01
1981 98.7 100.0 1980-12-31 15:00 to 1981-12-31 14:00 60 834-851, 3651-3683, 4010-4019, 4370-4378, 5509-5512, 7337-7378, 8701-8745 None ASLVZZ01
1981 98.7 100.0 1980-12-31 15:00 to 1981-12-31 14:00 60 834-851, 3651-3683, 4010-4019, 4370-4378, 5509-5512, 7337-7378, 8701-8745 None ASLVZZ01
1982 99.7 100.0 1981-12-31 15:00 to 1982-12-31 14:00 60 1299-1306, 3201-3203, 3934-3947 None ASLVZZ01
1983 99.6 100.0 1982-12-31 15:00 to 1983-12-31 14:00 60 372-395, 1009-1019 None ASLVZZ01
1984 99.3 100.0 1983-12-31 15:00 to 1984-12-31 14:00 60 1698-1715, 6438-6441, 6453-6454, 6488-6490, 7443-7451, 7455-7456, 8416-8435 None ASLVZZ01
1985 99.9 100.0 1984-12-31 15:00 to 1985-12-31 14:00 60 4350, 6871-6872, 8698-8699 None ASLVZZ01
1986 99.5 100.0 1985-12-31 15:00 to 1986-12-31 14:00 60 4370-4379, 4953-4963, 6396-6401, 7206-7211, 8349-8363 None ASLVZZ01
1987 99.3 100.0 1986-12-31 15:00 to 1987-12-31 14:00 60 4457-4475, 6973-6996, 7395-7404, 7419-7428 None ASLVZZ01
1988 100.0 100.0 1987-12-31 15:00 to 1988-12-31 14:00 60 4457-4475, 6973-6996, 7395-7404, 7419-7428 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 99.9 100.0 1990-12-31 15:00 to 1991-12-31 14:00 60 7272-7274 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 99.8 1994-12-31 15:00 to 1995-12-31 14:00 60 None 6360-6363 ASLVZZ01
1996 100.0 99.7 1995-12-31 15:00 to 1996-12-31 14:00 60 None 5084-5108 ASLVZZ01
1997 99.6 100.0 1996-12-31 15:00 to 1997-12-31 14:00 60 4321-4354, 5032-5034 5084-5108 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 1068-1071 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 99.5 99.8 2005-12-31 15:00 to 2006-12-31 14:00 60 6197-6202, 6221-6275 6184-6209 ASLVZZ01
2007 98.9 100.0 2006-12-31 15:00 to 2007-12-31 14:00 60 4479-4575 None ASLVZZ01
2008 81.2 100.0 2007-12-31 15:00 to 2008-12-31 14:00 60 1872-3520 None ASLVZZ01
2009 100.0 100.0 2008-12-31 15:00 to 2009-12-31 14:00 60 None None ASLVZZ01