QUALITY ASSESSMENT OF SEA LEVEL DATA by the UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER JOINT ARCHIVE FOR SEA LEVEL Station : Clipperton-B Latitude: 10 16.8N Country : France Longitude: 109 13.3W JASL # : 391B Time Meridian: 105W (GMT - 7 hr) GLOSS # : 165 TOGA #: P070 NODC #: 71100901 Contributor : NOAA/PMEL 7600 Sand Point Way NE Seattle, WA 98115-0070 Originator : same Original Data: unconfirmed Instrmnt Type: unconfirmed Digitzd Intvl: unconfirmed Present Data : Hourly, daily, and monthly values obtained by: Hourly : unconfirmed Daily : unconfirmed Monthly: Simple average of all daily values; calculated if 7 or fewer days are missing Span of data : 21 Apr 1986 - 21 Oct 1988 Gaps > 1 mon : none Time Refernce: GMT (00-23 hours) Space-filler Flag :-9999 Units : millimeters Missing Data Flag : 9999 Existing : No Operational : No Sat. Trans. : No Distribution : 1986-1988 Refernce Levl: Due to the nature of the bottom-mounted pressure gauges, no link could be established between the zero of the gauge values and fixed points on land. Also, tide staff observations or the like were unavailable. This series has no long-term reference level. Comment : Although this data set is within the sea level archive, the user must acknowledge that these data represent inferred sea level from a sub- surface pressure gauge, which measures the combined weight of the column of water and air above it. A constant atmospheric pressure has been subtracted, but variations in atmospheric pressure, which would not be sensed by a conventional float/ well gauge, would affect the measurement of the sub-surface pressure gauge. The depth of the instrument in the water was unconfirmed. Techniques of data processing by the originator are unconfirmed. Only daily data received at the UH Sea Level Center. The short period variations appear reasonable however there appears to be a positive trend. Originator indicates no trend removed from the series. Due to the tendency for pressure gauge sensors to drift, it is beneficial for investigators to know the time span of each instrument deployment. However, this information was not supplied. Thus it is assumed that the time span above represents the span of a single instrument deployment. CI MISSING REPLACED GAPS QUESTIONABLE YEAR (%) DATA OR BAD DATA FLUCTUATIONS ---- --- -------------------- --------------- -------------------- 1986 70 none none none 1987 100 none none none 1988 81 none none none