QUALITY ASSESSMENT OF SEA LEVEL DATA by the UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER JOINT ARCHIVE FOR SEA LEVEL updated: 01 Sep 2020 Station : Mokuoloe, Oahu, Hawaii Latitude: 21 26.0N Country : USA Longitude: 157 48.0W JASL # : 061A Time Meridian: 150W (GMT - 10 hr) GLOSS # : none Originator #:1612480 NODC #: 72151704 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 (1957-1972); NOS (1973+) Original Data: analog (bubbler); digital (adr and NG) Instrmnt Type: unconfirmed, 1957-74; Bubbler gauge (1981-8/1983); analog-to-digital (adr) recorder (8/1983-1991); Aquatrak acoustic NOAA Next Generation Water Level Measuring System (NG) (1992-) Digitzd Intvl: hourly (bubbler); six-minute (adr and NG) NG sampling is three-minute average Present Data : Hourly, daily, and monthly values obtained by: Hourly : The original digitizing interval was hourly (bubbler); spot sampling on the hour (adr and NG) 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 May 1957 - 31 Dec 2019 Gaps > 1 mon : 31 Dec 1969 - 01 Jan 1971;01 Jan 1972 - 01 Apr 1974 01 Nov 1974 - 01 Jan 1981;01 Mar - 01 Aug 1991; 03 Sep - 31 Dec 1991 Time Refernce: GMT (hours 00-23) Space-filler Flag :-9999 Units : millimeters Missing Data Flag : 9999 Existing : Yes Operational : Yes Sat. Trans. : No Distribution : 1957-2019 Refernce Levl: All heights have been referred to the station tide staff zero which is linked to fixed bench marks. However, comparisons with Honolulu and examination of the hourly residuals led to the following adjustments: period value added ( (hour)day/month/year ) to original(mm) ----------------------------- --------------- (18)31/05/1968-(18)01/10/1968 50 (00)01/01/1971-(23)31/12/1971 25 (00)01/01/1974-(23)31/12/1974 75 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 or trends and agree well with the nearest stations. Notable episodic events: 23-25 May 1960: Tsunami from S.C. Chile 28 Mar 1964: Tsunami from Alaska 24 Nov 1982 : Hurricane Iwa CI MISSING REPLACED GAPS QUESTIONABLE YEAR (%) DATA OR BAD DATA FLUCTUATIONS ---- --- -------------------- --------------- -------------------- 1957 67 none (10)150-(00)151 none 1958 98 130-132,136-139, (21)135-(18)136 40 144-146 (00)142-(07)142 (01)143-(08)143 1959 98 81-82,83-90 (21)036-(19)037 none (08)072-(18)072 (08)080-(15)080 (07)083-(17)083 1960 100 none none none 1961 100 none (10)246-(20)246 none 1962 100 none none 1 1963 100 none (22)001-(07)002 none (19)271-(16)272 1964 100 none none none 1965 100 none none none 1966 91 4-32,301-305 (10)267-(09)268 none 1967 100 none none none 1968 100 none (20)028-(16)029 321-322 (01)050-(11)050 (20)214-(18)215 (05)242-(00)243 (02)254-(15)254 1969 99 365 (01)006-(11)006 283-285 (10)243-(23)243 (01)244-(09)244 (15)244-(01)245 1970 0 1-365 none none 1971 99 1 none none 1972 0 1-366 none none 1973 0 1-365 none none 1974 59 1-91,305-365 none none 1975 0 1-365 none none 1976 0 1-366 none none 1977 0 1-365 none none 1978 0 1-365 none none 1979 0 1-365 none none 1980 0 1-366 none none 1981 99 1 (10)084-(09)085 none 1982 100 none (02)307-(19)307 328-334 (22)329-(19)330 1983 100 none none 328-329 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 100 none none none 1991 25 60-213,246-365 none none 1992 100 none (18)015-(22)016 16-17 1993 100 none none none 1994 100 none none none 1995 100 none none none 1996 100 none none none 1997 100 none 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 157-160 2006 100 none none none 2007 100 none none none 2008 94 143-165 (13)043-(20)043 318-325 2009 100 none none none 2010 97 60-70 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