QUALITY ASSESSMENT OF SEA LEVEL DATA by the UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER JOINT ARCHIVE FOR SEA LEVEL updated: 12 Apr 2011 Station : Acajutla-B Latitude: 13 35.0N Country : El Salvador Longitude: 089 50.0W JASL # : 082B Time Meridian: 090W (GMT - 6 hr) GLOSS # : 182 TOGA #: P077 NODC #: 71083901 Contributor : Instituto Geografico Nacional Apartado 247 Avenida Juan Bertis 79, Delgado San Salvador, El Salvador Originator : same Original Data: analog Instrmnt Type: float and well gauge Digitzd Intvl: spot hourly Present Data : Hourly, daily, and monthly values obtained by: Hourly : spot hourly 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 Aug 2001 - 22 Dec 2009 Gaps > 1 mon : 28 Jan 2002 - 28 Feb 2002;08 Mar 2003 - 05 Feb 2004 17 Mar 2004 - 17 Apr 2004;28 May 2004 - 01 Jul 2004 15 Oct 2004 - 04 Apr 2005;01 Jul 2005 - 18 Oct 2005 08 Nov 2005 - 19 Jul 2006;08 Aug 2006 - 06 Mar 2007 03 Oct 2007 - 14 Dec 2007;31 Jan 2009 - 31 Mar 2009 25 Jun 2009 - 28 Aug 2009 Time Refernce: GMT (hours 00-23) Space-filler Flag :-9999 Units : millimeters Missing Data Flag : 9999 Existing : yes Operational : yes Sat. Trans. : yes Distribution : 2001-2009 Refernce Levl: Unstable reference level-- use with discretion. Obvious step-function level shifts were adjusted based on analysis of the hourly residuals and daily mean plots: start end added to original yyyy/mm/dd(hh)-yyyy/mm/dd(hh) (mm) 2001/08/01(00)-2002/01/08(23) -350 2002/03/01(00)-2002/03/31(23) -350 2002/05/01(00)-2002/06/04(15) -625 2002/07/30(14)-2002/08/27(23) -250 2002/08/28(00)-2003/03/07(23) -500 These adjustments are uncertain to a few CM. Comment : Acajutla-A is separate from Acajutla-B due to an obvious reference level shift in August 2001. The data are of low quality with large gaps, timing errors, and other unconfirmed errors. CI MISSING REPLACED GAPS QUESTIONABLE YEAR (%) DATA OR BAD DATA FLUCTUATIONS ---- --- -------------------- --------------- -------------------- 2001 42 none none 214-365 2002 81 28-59,91-95,103-105, (20)063-(19)064 1-28,95-365 176-178,182-211, (20)088-(16)089 227-228 (20)168-(04)169 (17)173-(13)174 (17)178-(07)179 (14)181-(22)181 (14)213-(01)214 (08)214-(18)214 (11)216-(22)216 (14)218-(22)218 (14)219-(01)220 (11)222-(22)222 (14)224-(22)224 (11)226-(19)226 (14)229-(23)229 (08)230-(19)230 (11)231-(01)232 (11)232-(04)233 (11)233-(22)233 (11)234-(22)234 (11)235-(22)235 (11)236-(19)236 (08)237-(01)238 (11)238-(01)239 (14)239-(01)240 (13)274-(05)275 2003 18 67-365 (04)051-(18)051 1-67 2004 49 1-36,77-108,113-120, none 36-289 130-133,142-143,149- 183,289-266 2005 30 1-94,182-291,312-365 none 94-312 2006 5 1-200,220-365 (03)211-(13)211 200-220 (06)212-(13)212 (02)220-(16)220 2007 61 1-65,125-129,228- none 65-365 229,276-348 2008 97 162-165,248-253, none 1-366 337-340 2009 57 31-90,118-125,136- (08)030-(19)030 1-356 138,176-240,272-286 (07)118-(19)118 (22)127-(06)128