QUALITY ASSESSMENT OF SEA LEVEL DATA by the UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER JOINT ARCHIVE FOR SEA LEVEL updated: 17 Sep 2020 Station : San Juan,Puerto Rico Latitude: 18 27.6N Country : USA Longitude: 066 07.0W JASL # : 245A Time Meridian: 060W (GMT - 4 hr) GLOSS # : 206 Originator #:9755371 NODC #: 71068601 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: 1) 1977-90, Analog-to-Digital Recorder (ADR) 2) 1991-, Aquatrak acoustic gauge, NOAA Next Generation Water Level Measuring System (NGWLMS) 3) Design Analysis WaterLOG Microwave sensor (MWWL) radar gauge (2017-) Digitzd Intvl: 6 minute (1991-, 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 : 29 Nov 1977 - 31 Dec 2019 Gaps > 1 mon : 04 Aug 1981 - 01 Dec 1981;03 Dec 1983 - 03 Jan 1984 02 Jun 1984 - 24 Jul 1984;31 May 1988 - 05 Sep 1988 12 Oct 1988 - 06 Mar 1989 Time Refernce: GMT (hours 00-23) Space-filler Flag :-9999 Units : millimeters Missing Data Flag : 9999 Existing : Yes Operational : Yes Sat. Trans. : Yes Distribution : 1977-2019 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 values do not show any obvious shifts or trends and agree well with Magueyes Island in SW Puerto Rico. The monthly plot reveals a consistent annual signal. The sharp peak on 18 Sep 1989 is due to Hurricane Hugo. The replaced gap in 1995 filled using data from a nearby site. CI MISSING REPLACED GAPS QUESTIONABLE YEAR (%) DATA OR BAD DATA FLUCTUATIONS ---- --- -------------------- --------------- -------------------- 1977 9 none none none 1978 100 none (00)345-(18)345 none 1979 100 none none 38-40 1980 100 none none none 1981 67 216-335 (15)186-(14)187 91-216 1982 99 145-146 none 36-39 1983 92 337-365 none none 1984 77 1-3,152-153,154-206 (07)148-(17)148 none (09)149-(23)149 (15)153-(23)153 1985 99 none none none 1986 100 none none none 1987 97 124-135 none none 1988 52 152-249,286-366 none none 1989 78 1-65,240-256 none none 1990 100 none none none 1991 99 35-40 none none 1992 100 none none none 1993 100 none none none 1994 100 none none none 1995 100 none (20)254-(13)261 none 1996 100 none none none 1997 100 none none none 1998 100 none none none 1999 92 156-170,213-228 (11)043-(20)043 none (13)154-(20)154 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 none 2010 94 175-196 none none 2011 99 362-365 none none 2012 95 1-18 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