QUALITY ASSESSMENT OF SEA LEVEL DATA by the UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER JOINT ARCHIVE FOR SEA LEVEL updated: 08 Oct 2020 Station : Dauphin Island, AL Latitude: 30 15.0N Country : USA Longitude: 088 04.5W JASL # : 763A Time Meridian: 090W (GMT - 6 hr) GLOSS # : none Originator #:8735180 NODC #: 73080801 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 (1981-1990); Aquatrak acoustic gauge, NOAA Next Generation Water Level Measuring System (NGWLMS) Digitzd Intvl: 6 minute (each sampling is three-minute average) Present Data : Hourly, daily, and monthly values obtained by: Hourly : discrete 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 : 31 Mar 1981 - 31 Dec 2019 Gaps > 1 mon : 13 Nov 1997 - 12 Sep 2001;01 Nov 2002 - 06 Dec 2002 15 Aug 2003 - 24 Nov 2003;26 Jan 2005 - 28 Feb 2005 01 Dec 2005 - 16 Feb 2006 Time Refernce: GMT (hours 00-23) Space-filler Flag :-9999 Units : millimeters Missing Data Flag : 9999 Existing : Yes Operational : Yes Sat. Trans. : Yes Distribution : 1981-2019 Refernce Levl: All heights have been referred to the station tide staff zero which is linked to fixed bench marks. Comment : The data are of good quality when the gauge was operating. CI MISSING REPLACED GAPS QUESTIONABLE YEAR (%) DATA OR BAD DATA FLUCTUATIONS ---- --- -------------------- --------------- -------------------- 1981 75 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 100 none none none 1991 100 none none none 1992 100 none none none 1993 100 none none none 1994 100 none none none 1995 100 none none none 1996 99 272-276 none none 1997 87 none none none 1998 0 1-365 none none 1999 0 1-365 none none 2000 0 1-366 none none 2001 30 1-255 none none 2002 85 46-62,133-135,305- (22)064-(20)065 none 340 (11)068-(19)068 (04)133-(12)133 2003 72 227-328 none none 2004 100 none none none 2005 77 26-59,121-138, none none 335-365 2006 87 1-47 none none 2007 100 none none none 2008 100 none none 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 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