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Chichijima (Japan) Data Quality Assessment

Quality Assessment of sea level data by the TOGA Sea Level Center/National Oceanographic Data Center Joint Archive for Sea Level.

Station Chichijima Latitude 27° 06.0' N
Country Japan Longitude 142° 11.0' E
JASL # 047A Time Meridian 135° E (GMT + 9 hr)
GLOSS # 103 TOGA # P013
NODC # 12147201
Contributor: Japan Ocean. Data Center Hydrographic Dept. Maritime Safety Agency 3-1,Tsukiji, 5-Chome, Chuo-ku Tokyo 104 Japan
Originator: Same
Original Data: Unconfirmed
Instrument Type: LFT-4
Digitized Interval: Unconfirmed
Present Data: Hourly, daily, and monthly values obtained by:
Hourly: Unconfirmed
Daily: 119-point convolution filter (Bloomfield, 1976) centred on noon applied to the hourly data with respective periods of the 95, 50, and 5% amplitude points at 124.0, 60.2, and 40.2 hours
Monthly: Simple average of all daily values; calculated if 7 or fewer days are missing
Span of Data: 31 March 1975 - 31 December 1986
Gaps >1 Month: None
Time Reference: GMT (hours 00-23)
Space-filler Flag: -9999
Units: Millimeters
Missing Data Flag: 99999
Reference Level: All data are referred to tide gauge zero and linked to historic fixed bench marks.
Comment: The daily or monthly means do not reveal any obvious reference level shifts.