QUALITY ASSESSMENT OF SEA LEVEL DATA by the UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER JOINT ARCHIVE FOR SEA LEVEL updated: 11 Apr 2011 Station : Acajutla-A Latitude: 13 35.0N Country : El Salvador Longitude: 089 50.0W JASL # : 082A 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 *Below for digitization of 1971-1986 data: UH Sea Level Center 1000 Pope Rd. MSB 317 Honolulu, Hawaii 96822 and 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 : Instituto Geografico Nacional and May-July 2001 NOAA/NOS Original Data: analog and digital (AC) Instrmnt Type: float and well gauge and 5-7 July 2001: Aquatrak acoustic (AC) gauge Digitzd Intvl: spot hourly; AC: 6-min (3-min average) 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 : 18 Jul 1962 - 31 Jul 2001 Gaps > 1 mon : 19 Feb 1986 - 30 Jul 1986;13 Jun 1987 - 02 Jan 1988 01 Mar 2001 - 30 Apr 2001 Time Refernce: GMT (hours 00-23) Space-filler Flag :-9999 Units : millimeters Missing Data Flag : 9999 Existing : yes Operational : yes Sat. Trans. : yes Distribution : 1962-2001 Refernce Levl: Tide staff comparisons were maintained throughout the period. Step-function level shifts were adjusted based on confirmation of shifts in the analog rolls by the originators with the magnitude of the shifts 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) 1981/03/01(16)-1981/04/22(16) 200 1981/04/22(17)-1981/04/25(15) 300 1981/05/02(20)-1982/04/09(14) 300 1982/04/12(17)-1982/04/15(10) -280 1982/04/16(12)-1982/04/24(23) 300 1982/04/29(20)-1982/05/07(14) -280 1982/05/07(15)-1982/05/15(17) 600 1982/05/15(18)-1982/12/29(13) 400 1982/12/29(14)-1983/02/19(16) 500 1983/02/19(17)-1983/04/23(16) 300 1983/04/23(17)-1983/04/28(13) 100 1983/04/28(14)-1983/05/02(20) 300 1983/05/02(21)-1983/07/01(12) 500 1984/01/01(15)-1984/01/06(19) 300 1984/01/06(20)-1985/08/11(14) 100 1985/08/11(15)-1985/08/24(13) 350 1985/08/24(14)-1985/09/21(13) 300 1985/09/21(14)-1985/12/12(11) 450 1985/12/12(12)-1986/01/01(17) 100 1986/01/01(18)-1986/02/28(23) 300 1989/04/07(22)-1989/04/10(15) 250 1989/04/10(16)-1989/05/01(23) -200 1993/10/01(14)-1993/10/16(09) -180 1993/10/16(10)-1993/11/01(19) 140 1994/02/23(18)-1994/03/01(24) -300 1998/02/01(20)-1998/02/11(15) 400 1998/02/11(16)-1998/03/01(20) -150 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. Timing accuracy is not better than + or - 7 minutes for some spans. Only large timing shifts or questionable fluctuations are note below. CI MISSING REPLACED GAPS QUESTIONABLE YEAR (%) DATA OR BAD DATA FLUCTUATIONS ---- --- -------------------- --------------- -------------------- 1962 45 228-230 (06)260-(05)261 230-235 (06)290-(04)291 (14)319-(22)319 (06)321-(05)322 (06)351-(04)352 1963 98 99-106 none 1-3,40-41,77 1964 100 none none 61-365 1965 100 none none 34-35,131-132 1966 99 246-249 (17)244-(05)245 none 1967 100 none none none 1968 100 none (14)061-(05)062 289-290 1969 96 308-322 none none 1970 100 none none none 1971 100 none (19)024-(05)025 none 1972 100 none none none 1973 100 none (19)080-(03)081 244-245 1974 100 none none 114-117 1975 100 none (20)082-(03)083 3,63,82-120,191-199, (16)121-(03)122 220,223-225,248-252, 264-269,280-283,288 1976 100 none none none 1977 100 none (16)029-(23)029 37-39 (08)030-(17)030 (06)365-(23)365 1978 100 none (20)191-(05)192 none (11)197-(17)197 1979 100 none (09)002-(15)002 356-357 1980 100 none none 2-5,36,356-360 1981 100 none none none 1982 98 99-102,105-106, none none 115-119 1983 100 none none none 1984 100 none none none 1985 99 346-347 none none 1986 56 50-211 (06)302-(13)302 none (04)303-(13)303 1987 45 167-365 none 1,133-140 1988 99 1-2 none none 1989 99 272-274 none 30-31 1990 100 none (23)073-(14)074 none (07)206-(16)206 1991 100 none none none 1992 100 none (16)124-(03)125 184,198-199,214-216 (06)227-(13)227 (00)232-(07)232 (18)235-(05)236 1993 100 none (13)182-(22)182 39-42,98,293 (21)261-(17)262 (15)280-(03)281 1994 96 204-206,274-278,280- (16)042-(03)043 222-224,236-238,250, 284,285-290 (19)348-(05)349 256,263-264 1995 100 none (15)135-(23)135 none (20)191-(04)192 (18)291-(05)292 1996 100 none (01)129-(15)129 50-55,63-70,82,155, (10)180-(03)181 159,163,186-187,208, 228,245-246,260-261, 270-271,324-328,350- 351,360-361 1997 100 none none 37,40-42,47-48,61- 62,76,89,101,104, 115-117,145,173-174, 187-188,201-202,219, 229-232,258,286,299, 307 1998 100 none (12)126-(21)126 12,116-117,144- (06)184-(17)184 145,148 1999 96 306-307,310-312, (02)006-(14)006 none 319-321,322-334 (09)244-(19)244 (09)269-(20)269 (00)271-(12)271 (08)272-(15)272 (03)274-(12)274 (03)275-(12)275 (02)278-(13)278 (18)283-(12)284 (11)305-(23)305 (07)308-(15)308 (03)309-(20)309 (00)310-(13)310 (04)312-(13)312 (23)312-(12)313 (22)313-(12)314 (17)314-(12)315 (18)315-(12)316 (17)316-(12)317 (20)317-(12)318 (17)321-(14)322 (07)358-(01)359 (13)364-(21)364 (03)365-(13)365 2000 99 29-31 (03)089-(12)089 none (21)213-(14)214 (11)320-(23)320 2001 41 13-15,60-120 none none