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 |
