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 : Prudhoe Bay, AK Latitude: 70 24.0N Country : USA Longitude: 148 31.6W JASL # : 579A Time Meridian: 135W (GMT - 9 hr) GLOSS # : 151 Originator #:9497645 NODC #: 77140801 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 (1989-1990); Aquatrak acoustic gauge, NOAA Next Generation Water Level Measuring System (NGWLMS) Fan blows in well to prevent icing.; Design Analysis WaterLOG Microwave sensor (MWWL) radar gauge (2017-) Digitzd Intvl: six-minute NGWLMS,MWWL sampling is a 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 (others) 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 : 30 Apr 1989 - 31 Dec 2019 Gaps > 1 mon : 26 Feb 1990 - 01 Sep 1990;01 Nov 1991 - 27 Dec 1991 13 Nov 1992 - 27 Jun 1993 Time Refernce: GMT (hours 00-23) Space-filler Flag :-9999 Units : millimeters Missing Data Flag : 9999 Existing : Yes Operational : Yes Sat. Trans. : Yes Distribution : 1989-2019 Refernce Levl: All heights have been referred to the station tide staff zero which is linked to fixed bench marks. A constant of 9199 mm (30.18') was subtracted from the original data to fit the JASL format. Comment : The daily and monthly means reveal no apparent reference level changes or trends. CI MISSING REPLACED GAPS QUESTIONABLE YEAR (%) DATA OR BAD DATA FLUCTUATIONS ---- --- -------------------- --------------- -------------------- 1989 67 175-177 none none 1990 49 57-244 none none 1991 81 281-285,287-298, none none 305-361 1992 79 165-177,287-303,312- none none 314,318-366 1993 51 1-178 none none 1994 100 none none none 1995 100 none none none 1996 100 none none none 1997 100 none (16)307-(23)307 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 98 192-195,331-335 none none 2004 98 340-341,359-364 none none 2005 99 354-357 none none 2006 100 none none none 2007 100 none none none 2008 98 229-235 none none 2009 100 none none none 2010 100 none none none 2011 100 none none none 2012 100 none none none 2013 95 229-241,242-249 none none 2014 100 none none none 2015 100 none none none 2016 96 162-178 none none 2017 100 none none none 2018 100 none none none 2019 100 none none none