QUALITY ASSESSMENT OF SEA LEVEL DATA by the UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER JOINT ARCHIVE FOR SEA LEVEL updated: 16 May 2002 Station : Port San Luis, CA Latitude: 35 10.6N Country : USA Longitude: 120 45.6W JASL # : 565A Time Meridian: 120W (GMT - 8 hr) GLOSS # : none Originator #:9412110 NODC #: 73125001 Contributor : National Ocean Service (NOS) National Ocean. and Atmos. Administration (NOAA) N/OES22 SSMC4, STATION 7109 1305 East West Highway Silver Spring, MD. 20910-3233 Originator : same Original Data: digital Instrmnt Type: analog-to-digital (ADR) recorder (1983-1991); Aquatrak acoustic gauge, NOAA Next Generation Water Level Measuring System (NGWLMS) (1991-) Digitzd Intvl: six-minute NGWLMS sampling is three-minute average Present Data : Hourly, daily, and monthly values obtained by: Hourly : spot sampling on the hour Daily : 119-point convolution filter (Bloomfield, 1976) centered 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 : 01 Jan 1983 - 31 Dec 2001 Gaps > 1 mon : 01 Jan 1993 - 31 Dec 1995 Time Refernce: GMT (hours 00-23) Space-filler Flag :-9999 Units : millimeters Missing Data Flag : 9999 Existing : Yes Operational : Yes Sat. Trans. : Yes Distribution : 1983-2001 Refernce Levl: All heights have been referred to the station tide staff zero which is linked to fixed bench marks. While standard mechanical or ADR instrument was the primary gauge, leveling calibration factors were applied monthly based on tide staff comparisons. Comment : The daily and monthly means reveal no apparent reference level changes. The winter months show high amplitude noise in the residuals while the float/well ADR was the primary gauge. This is associated with seiching in the harbor during periods of open ocean swell. CI MISSING REPLACED GAPS QUESTIONABLE YEAR (%) DATA OR BAD DATA FLUCTUATIONS ---- --- -------------------- --------------- -------------------- 1983 100 none none none 1984 100 none none none 1985 100 none none none 1986 100 none none none 1987 100 none none none 1988 100 none none none 1989 100 none none none 1990 97 48-61 none none 1991 100 none none none 1992 99 322-324 none none 1993 0 1-365 none none 1994 0 1-365 none none 1995 0 1-365 none none 1996 94 240-262 (09)134-(18)134 none 1997 98 49-52,74-79 none none 1998 100 none none none 1999 100 none none none 2000 100 none none none 2001 100 none none none