QUALITY ASSESSMENT OF SEA LEVEL DATA by the UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER JOINT ARCHIVE FOR SEA LEVEL Station : Manzanillo-A Latitude: 19 03.2N Country : Mexico Longitude: 104 19.8W JASL # : 395A Time Meridian: 090W (GMT - 6 hr) GLOSS # : 163 TOGA #: P074 NODC #: 71109401 Contributor : Servicio Mareografico Nacional Instituto de Geofisica Universidad Nacional Autonoma de Mexico 04510 Mexico, D. F. MEXICO Originator : same Original Data: analog Instrmnt Type: standard gauge with float and stilling well Digitzd Intvl: hourly to tenths of feet Present Data : Hourly, daily, and monthly values obtained by: Hourly : spot sample on the hour from the analog roll 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 May 1953 - 23 Dec 1982 Gaps > 1 mon : 01 Oct 1959 - 01 Jan 1961;01 Jan 1979 - 02 Feb 1979 Time Refernce: GMT (hours 00-23) Space-filler Flag :-9999 Units : millimeters Missing Data Flag : 9999 Existing : Yes Operational : Yes Sat. Trans. : No Distribution : 1953-1982 Refernce Levl: The data are referred to tide staff zero which is linked to fixed bench marks. Comment : The daily and monthly values do not reveal any obvious reference level shifts or trends and agree well with Acapulco except for a possible shift of about -8 cm between 08 June - 06 July 1955 and also between 29 Oct - 19 Nov 1955. These questionable level shifts do not appear to affect the long term reference level stability. The timing is good for most of the series. Notable episodic events: 09-10 Mar 1957: Tsunami from C. Aleutians 28 Mar 1964: Tsunami from Alaska CI MISSING REPLACED GAPS QUESTIONABLE YEAR (%) DATA OR BAD DATA FLUCTUATIONS ---- --- -------------------- --------------- -------------------- 1953 67 238-240 (01)144-(08)144 121-131,153-158,180- (00)254-(07)254 184,239-244,321-324 (15)258-(04)259 1954 100 none (21)261-(14)262 271-272 1955 100 none (03)107-(11)107 167-169,254,261,272, (06)200-(17)200 323 (01)351-(22)351 1956 100 none (06)134-(18)134 318-331,355-360 1957 100 none none 69-70,73-74,190,266, 305-310 1958 99 364-365 (09)068-(19)068 5-6,17-21 (04)104-(11)104 (07)187-(15)187 (02)196-(23)196 1959 75 1,274-364 none 18-21,203 1960 0 1-366 none none 1961 99 1 (15)032-(23)032 none 1962 100 none (00)299-(09)299 248-250 (00)301-(09)301 (10)339-(21)339 1963 100 none (08)173-(21)173 none (02)287-(11)287 1964 100 none (20)007-(04)008 none (20)248-(18)249 (02)309-(20)309 (22)325-(11)326 1965 100 none (12)265-(11)266 none (18)319-(05)320 1966 100 none none none 1967 100 none (13)001-(01)002 none 1968 100 none (11)084-(03)085 98-100 (07)221-(15)221 1969 100 none (00)011-(22)011 311-312 (00)013-(16)013 (01)049-(15)049 (15)113-(10)114 (18)115-(16)116 (00)165-(22)165 (02)168-(22)168 (00)179-(20)179 (00)198-(09)198 (00)240-(10)240 (01)244-(21)244 (13)252-(23)252 (12)256-(22)256 (07)277-(17)277 (06)284-(23)284 (04)294-(23)294 (14)298-(23)298 (03)304-(16)304 (01)305-(15)305 (14)341-(22)341 (15)356-(23)356 (00)359-(09)359 1970 100 none (13)062-(05)063 none (17)080-(02)081 (08)081-(16)081 (11)091-(23)091 (05)108-(13)108 (01)137-(18)137 (00)138-(09)138 (03)145-(16)145 (23)148-(08)149 (01)171-(13)171 (07)180-(17)180 (12)201-(20)201 (02)211-(09)211 (07)243-(23)243 (04)248-(11)248 1971 100 none (07)062-(06)063 none (04)114-(14)114 (01)243-(23)243 1972 100 none (07)001-(23)001 none (17)159-(06)160 (06)186-(20)186 (00)204-(11)204 (09)274-(20)274 (14)296-(07)297 1973 100 none (06)145-(17)145 252 (01)146-(08)146 1974 100 none (10)244-(18)244 none 1975 100 none (00)154-(07)154 none (07)177-(17)177 (16)191-(23)191 (03)254-(20)254 (14)274-(23)274 1976 100 none (00)008-(07)008 none (16)114-(03)115 (15)121-(22)121 (00)162-(16)162 (09)224-(20)224 (12)284-(23)284 (09)291-(18)291 1977 100 none (06)096-(13)096 184 (04)263-(15)263 (03)281-(10)281 (15)305-(23)305 (14)362-(23)362 1978 100 none (02)085-(21)085 258-261 (00)218-(11)218 1979 91 1-33 (07)038-(06)039 none (01)054-(21)054 (12)205-(10)206 (12)206-(23)206 (13)274-(23)274 1980 100 none (10)165-(19)165 none (03)179-(10)179 1981 100 none (00)016-(11)016 none (12)088-(23)088 (08)252-(17)252 (18)305-(14)306 1982 100 none none none