QUALITY ASSESSMENT OF SEA LEVEL DATA by the UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER JOINT ARCHIVE FOR SEA LEVEL updated: 18 Aug 2020 Station : Kodiak Isl.,Alaska Latitude: 57 43.9N Country : USA Longitude: 152 30.7W JASL # : 039A Time Meridian: 135W (GMT - 9 hr) GLOSS # : none Originator #:9457292 NODC #: 75157201 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: analog (standard); digital (ADR and NG) Instrmnt Type: 1) St. Paul's Harbor gas purging "bubbler" analog pressure gauge (1/75- 7/82); analog-to-digital punch-paper-tape float (ADR) recorder (8/82-10/84); 2) Women's Bay, USCG North Cargo Pier ADR float gauge (6/84-8/93); Aquatrak acoustic gauge, NOAA Next Generation Water Level Measuring System (NG) (7/93-) Digitzd Intvl: hourly (standard); 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 (standard); spot sampling on the hour (adr/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 Jan 1975 - 31 Dec 2019 Gaps > 1 mon : 01 Nov 1975 - 01 Dec 1975;01 Jan 1977 - 01 Jan 1982 Time Refernce: GMT (hours 00-23) Space-filler Flag :-9999 Units : millimeters Missing Data Flag : 9999 Existing : Yes Operational : Yes Sat. Trans. : Yes Distribution : 1975-2019 Refernce Levl: All heights have been referred to the station tide staff zero which is linked to fixed bench marks. The data were received from the originators from two sites: site lat lon St.Paul's Harbor 57 44.7N 152 29.0W Women's Bay 57 43.9N 152 30.7W with three segments: segment site time span 9457283 St.Paul's Harbor 1/75 - 10/84 9457292 Women's Bay (ADR) 7/84 - 8/93 7457292 Women's Bay (NG) 7/93 - present Based on overlaps of several months and geodetic leveling information, the Women's Bay series were adjusted by -23.19 feet (-7068 mm) to the historic level of St. Paul's Harbor. While standard mechanical, bubbler, or ADR instrument was the primary gauge, leveling calibration factors were applied monthly based on tide staff comparisons. Comment : The mean level appears to drop on 1 Jan 1989 but it is unclear whether the change is caused by natural events or instrument/processing errors. The quality of the timing improves by 1985. CI MISSING REPLACED GAPS QUESTIONABLE YEAR (%) DATA OR BAD DATA FLUCTUATIONS ---- --- -------------------- --------------- -------------------- 1975 89 1,48-56,305-338 none none 1976 92 308-366 (04)022-(20)022 47-48 (12)075-(09)076 (04)088-(13)088 (13)200-(21)200 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 0 1-365 none none 1982 99 1 none 335-338 1983 100 none none 276,282-283,310-313, 326-327,334 1984 100 none none 181-182 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 100 none none none 1992 100 none none none 1993 100 none none none 1994 89 33-59,340-353 (23)196-(11)197 none 1995 99 126-132 (21)109-(13)110 none (03)135-(21)135 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 99 237-239 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 93 69-96 none 9-11,23-26 2008 97 39-49 (03)048-(18)048 none 2009 100 none none none 2010 100 none none none 2011 100 none none none 2012 100 none none none 2013 100 none none 165-169 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