QUALITY ASSESSMENT OF SEA LEVEL DATA by the UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER JOINT ARCHIVE FOR SEA LEVEL updated: 15 Sep 2020 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 : US Coastal Geodetic Survey (1948-1972); NOS (1973+) Original Data: analog (standard); digital (ADR and NGWLMS) Instrmnt Type: standard mechanical (1948-1974); analog-to-digital (ADR) recorder (1975-1990); Aquatrak acoustic gauge, NOAA Next Generation Water Level Measuring System (NGWLMS) (1991-) 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 1948 - 31 Dec 2019 Gaps > 1 mon : 02 Apr 1952 - 25 Jul 1952;11 Apr 1956 - 29 Jun 1956 01 Sep 1957 - 29 Oct 1957;09 Feb 1960 - 05 Oct 1960 17 Nov 1960 - 31 Dec 1960;01 Feb 1963 - 05 Mar 1963 01 Dec 1965 - 04 Mar 1966;20 May 1968 - 01 Jan 1969 02 Mar 1971 - 03 Dec 1971;08 Feb 1977 - 17 Mar 1977 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 : 1948-2019 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. Tsunami signals are noted 30 Sep 2009 (SW Pacific), 28 Feb 2010 (Chile), and 11 Mar 2011 (Japan). Major timing problems are evident in 1969. Tsunami signal : 05-06 Nov 1952 28-30 Mar 1964 11-13 Mar 2011 CI MISSING REPLACED GAPS QUESTIONABLE YEAR (%) DATA OR BAD DATA FLUCTUATIONS ---- --- -------------------- --------------- -------------------- 1948 99 1 none none 1949 100 none none none 1950 100 none none none 1951 100 none none none 1952 69 93-207 none none 1953 100 none none none 1954 100 none none none 1955 100 none none none 1956 79 102-181 none none 1957 84 244-302 none 69-70 1958 100 none none 192-195,209-215, 314-315 1959 100 none none 80-82,144-148 1960 21 40-279,287-292, none none 322-366 1961 100 none none none 1962 100 none (08)126-(22)126 none (18)152-(07)153 1963 89 32-64,112-121 none 114-115 1964 90 302-313,315-317, none 349-354 338-348,354-366 1965 87 335-365 (00)020-(17)020 none 1966 83 1-63 none none 1967 97 127-129,136-138,140- none none 143,145-148 1968 38 141-366 none none 1969 99 1 none 17-28,46-58,120-365 1970 100 none none none 1971 24 61-337 none none 1972 100 none none none 1973 100 none none 36-38 1974 100 none (05)285-(19)285 249 1975 100 none (08)191-(18)191 none 1976 95 8-11,63-65,123-137 (07)337-(01)338 273-275 1977 90 39-76 (01)019-(00)020 none 1978 100 none none 343-365 1979 100 none none none 1980 100 none none 61-68 1981 100 none none none 1982 100 none none none 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 2002 100 none none none 2003 100 none none none 2004 100 none none none 2005 100 none none none 2006 100 none none none 2007 100 none none none 2008 100 none none none 2009 100 none none 204-213 2010 94 29-34,36-42,61-71 none none 2011 100 none none none 2012 100 none none none 2013 100 none none none 2014 100 none none none 2015 100 none none none 2016 100 none none none 2017 100 none none none 2018 100 none none none 2019 100 none none none