186SL0946171109401 395A 19530501 19821223 1903N 10420W 2 00000R 0000 MM 186SL0946271109401 Manzanillo Mexico UNAM 186SL094630001 186SL094630002 QUALITY ASSESSMENT OF SEA LEVEL DATA 186SL094630003 by the 186SL094630004 TOGA SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER 186SL094630005 JOINT ARCHIVE FOR SEA LEVEL 186SL094630006 186SL094630007Station : Manzanillo Latitude: 19 03.2N 186SL094630008Country : Mexico Longitude: 104 19.8W 186SL094630009JASL # : 395A Time Meridian: 090W (GMT - 6 hr) 186SL094630010GLOSS # : 163 TOGA #: P074 NODC #: 71109401 186SL094630011Contributor : Servicio Mareografico Nacional 186SL094630012 Instituto de Geofisica 186SL094630013 Universidad Nacional Autonoma de Mexico 186SL094630014 04510 Mexico, D. F. 186SL094630015 MEXICO 186SL094630016Originator : same 186SL094630017Original Data: analog 186SL094630018Instrmnt Type: standard gauge with float and stilling well 186SL094630019Digitzd Intvl: hourly to tenths of feet 186SL094630020Present Data : Hourly, daily, and monthly values obtained by: 186SL094630021 Hourly : spot sample on the hour from the analog roll 186SL094630022 Daily : 119-point convolution filter (Bloomfield, 1976) 186SL094630023 centered on noon applied to the hourly data 186SL094630024 with respective periods of the 95, 50, and 5% 186SL094630025 amplitude points at 124.0, 60.2, and 40.2 hours 186SL094630026 Monthly: Simple average of all daily values; calculated if 186SL094630027 7 or fewer days are missing 186SL094630028Span of data : 01 May 1953 - 23 Dec 1982 186SL094630029Gaps > 1 mon : 01 Oct 1959 - 01 Jan 1961;01 Jan 1979 - 02 Feb 1979 186SL094630030Time Refernce: GMT (hours 00-23) Space-filler Flag :-9999 186SL094630031Units : millimeters Missing Data Flag :99999 186SL094630032Refernce Levl: The data are referred to tide staff zero which is 186SL094630033 linked to fixed bench marks. 186SL094630034Comment : The daily and monthly values do not reveal any 186SL094630035 obvious reference level shifts or trends and agree 186SL094630036 well with Acapulco except for a possible shift 186SL094630037 of about -8 cm between 08 June - 06 July 1955 and 186SL094630038 also between 29 Oct - 19 Nov 1955. These 186SL094630039 questionable level shifts do not appear to affect 186SL094630040 the long term reference level stability. The 186SL094630041 timing is good for most of the series. 186SL094630042 186SL094630043 CI MISSING REPLACED GAPS QUESTIONABLE 186SL094630044YEAR (%) DATA OR BAD DATA FLUCTUATIONS 186SL094630045---- --- -------------------- --------------- -------------------- 186SL0946300461953 67 238-240 (01)144-(08)144 121-131,153-158,180- 186SL094630047 (00)254-(07)254 184,239-244,321-324 186SL094630048 (15)258-(04)259 186SL0946300491954 100 none (21)261-(14)262 271-272 186SL0946300501955 100 none (03)107-(11)107 167-169,254,261,272, 186SL094630051 (06)200-(17)200 323 186SL094630052 (01)351-(22)351 186SL0946300531956 100 none (06)134-(18)134 318-331,355-360 186SL0946300541957 100 none none 69-70,73-74,190,266, 186SL094630055 305-310 186SL0946300561958 99 364-365 (09)068-(19)068 5-6,17-21 186SL094630057 (04)104-(11)104 186SL094630058 (07)187-(15)187 186SL094630059 (02)196-(23)196 186SL0946300601959 75 1,274-364 none 18-21,203 186SL0946300611960 0 1-366 none none 186SL0946300621961 99 1 (15)032-(23)032 none 186SL0946300631962 100 none (00)299-(09)299 248-250 186SL094630064 (00)301-(09)301 186SL094630065 (10)339-(21)339 186SL0946300661963 100 none (08)173-(21)173 none 186SL094630067 (02)287-(11)287 186SL0946300681964 99 88-91 (20)007-(04)008 none 186SL094630069 (20)248-(18)249 186SL094630070 (02)309-(20)309 186SL094630071 (22)325-(11)326 186SL0946300721965 100 none (12)265-(11)266 none 186SL094630073 (18)319-(05)320 186SL0946300741966 100 none none none 186SL0946300751967 100 none (13)001-(01)002 none 186SL0946300761968 100 none (11)084-(03)085 98-100 186SL094630077 (07)221-(15)221 186SL0946300781969 100 none (00)011-(22)011 311-312 186SL094630079 (00)013-(16)013 186SL094630080 (01)049-(15)049 186SL094630081 (15)113-(10)114 186SL094630082 (18)115-(16)116 186SL094630083 (00)165-(22)165 186SL094630084 (02)168-(22)168 186SL094630085 (00)179-(20)179 186SL094630086 (00)198-(09)198 186SL094630087 (00)240-(10)240 186SL094630088 (01)244-(21)244 186SL094630089 (13)252-(23)252 186SL094630090 (12)256-(22)256 186SL094630091 (07)277-(17)277 186SL094630092 (06)284-(23)284 186SL094630093 (04)294-(23)294 186SL094630094 (14)298-(23)298 186SL094630095 (03)304-(16)304 186SL094630096 (01)305-(15)305 186SL094630097 (14)341-(22)341 186SL094630098 (15)356-(23)356 186SL094630099 (00)359-(09)359 186SL0946301001970 100 none (13)062-(05)063 none 186SL094630101 (17)080-(02)081 186SL094630102 (08)081-(16)081 186SL094630103 (11)091-(23)091 186SL094630104 (05)108-(13)108 186SL094630105 (01)137-(18)137 186SL094630106 (00)138-(09)138 186SL094630107 (03)145-(16)145 186SL094630108 (23)148-(08)149 186SL094630109 (01)171-(13)171 186SL094630110 (07)180-(17)180 186SL094630111 (12)201-(20)201 186SL094630112 (02)211-(09)211 186SL094630113 (07)243-(23)243 186SL094630114 (04)248-(11)248 186SL0946301151971 100 none (07)062-(06)063 none 186SL094630116 (04)114-(14)114 186SL094630117 (01)243-(23)243 186SL0946301181972 100 none (07)001-(23)001 none 186SL094630119 (17)159-(06)160 186SL094630120 (06)186-(20)186 186SL094630121 (00)204-(11)204 186SL094630122 (09)274-(20)274 186SL094630123 (14)296-(07)297 186SL0946301241973 100 none (06)145-(17)145 252 186SL094630125 (01)146-(08)146 186SL0946301261974 100 none (10)244-(18)244 none 186SL0946301271975 100 none (00)154-(07)154 none 186SL094630128 (07)177-(17)177 186SL094630129 (16)191-(23)191 186SL094630130 (03)254-(20)254 186SL094630131 (14)274-(23)274 186SL0946301321976 100 none (00)008-(07)008 none 186SL094630133 (16)114-(03)115 186SL094630134 (15)121-(22)121 186SL094630135 (00)162-(16)162 186SL094630136 (09)224-(20)224 186SL094630137 (12)284-(23)284 186SL094630138 (09)291-(18)291 186SL0946301391977 100 none (06)096-(13)096 184 186SL094630140 (04)263-(15)263 186SL094630141 (03)281-(10)281 186SL094630142 (15)305-(23)305 186SL094630143 (14)362-(23)362 186SL0946301441978 100 none (02)085-(21)085 258-261 186SL094630145 (00)218-(11)218 186SL0946301461979 91 1-33 (07)038-(06)039 none 186SL094630147 (01)054-(21)054 186SL094630148 (12)205-(10)206 186SL094630149 (12)206-(23)206 186SL094630150 (13)274-(23)274 186SL0946301511980 100 none (10)165-(19)165 none 186SL094630152 (03)179-(10)179 186SL0946301531981 100 none (00)016-(11)016 none 186SL094630154 (12)088-(23)088 186SL094630155 (08)252-(17)252 186SL094630156 (18)305-(14)306 186SL0946301571982 100 none none none 186SL094630158 186SL094630159 QUALITY ASSESSMENT POLICY 186SL094630160 186SL094630161 The quality assessment is mostly based on the residuals 186SL094630162 (observed data minus predicted tides) of the hourly data. This 186SL094630163 assessment also applies to the daily and monthly data since 186SL094630164 they were derived from the quality-controlled hourly data. 186SL094630165 186SL094630166 The following abbreviations are used in the assessment: 186SL094630167 JASL - Joint Archive for Sea Level; GLOSS - Global Sea Level 186SL094630168 Observing System; TOGA - Tropical Ocean Global Atmosphere 186SL094630169 research program; NODC - National Oceanographic Data Center; 186SL094630170 Instrmnt - instrument; Digitzd Intvl - digitized interval; 186SL094630171 Gaps > 1 mon - missing data in a span greater than one month; 186SL094630172 Refernce - reference. 186SL094630173 186SL094630174 The following corrections are made to the hourly data 186SL094630175 prior to this assessment: 186SL094630176 1) Gaps or obviously wrong data points in a span less than 186SL094630177 25 hours are filled by the predicted tide method*. 186SL094630178 2) Timing errors of exact increments of an hour are corrected 186SL094630179 by shifting the data. 186SL094630180 3) Reference level shifts are only corrected after information 186SL094630181 from tide staff readings or comparative readings with a fixed 186SL094630182 bench mark are checked to verify that the shift was not a 186SL094630183 natural event. If comparative readings are missing or 186SL094630184 incomplete, comparisons of the data with nearby stations 186SL094630185 may warrant the adjustment of some obvious shifts. 186SL094630186 4) Data with unresolved datum shifts are not disseminated. 186SL094630187 However, if sufficient time spans of data are available before 186SL094630188 or after the year(s) with the unresolved shift(s), a subset of 186SL094630189 quality assured data is made available. Thus, the Span field 186SL094630190 in the Quality Assessment may not match the span of the 186SL094630191 distribution data set. As the questionable datum shifts are 186SL094630192 resolved, the data set will be updated. Although this policy 186SL094630193 adds some complexity, it allows more rapid dissemination of 186SL094630194 at least the quality assured years. 186SL094630195 186SL094630196 For each year, the following information is documented from 186SL094630197 the quality-controlled hourly data with dates given as the nth 186SL094630198 day of the year starting from 1 January: 186SL094630199 1) a Completeness Index (CI) based on the percentage of hours 186SL094630200 with available data, 186SL094630201 2) a list of gaps longer than a day, 186SL094630202 3) a summary of days with consecutive missing or obviously 186SL094630203 wrong data in a time span longer than 6 but less than 25 186SL094630204 hours that have been replaced, with hours in parentheses, and 186SL094630205 4) a summary of days with questionable fluctuations in the 186SL094630206 residual series. Fluctuations within the residuals are 186SL094630207 considered significant and are noted if they are greater than 186SL094630208 25 cm. This policy has changed slightly as of October 1992: 186SL094630209 only suspicious fluctuations due to obvious instrumentation 186SL094630210 problems are noted. Minor timing drifts are no longer 186SL094630211 included in the list of questionable days. 186SL094630212 186SL094630213 Note : If the predicted tides poorly model the observed heights 186SL094630214 due to the inability of the tidal analysis to completely resolv 186SL094630215 the non-linear shallow water effects, the residuals are not 186SL094630216 suitable for assessing the data quality. Instead, a subjective 186SL094630217 comment on the quality of the data is provided. 186SL094630218 186SL094630219 *The predicted tides are obtained with the use of a harmonic 186SL094630220 analysis program (Foreman, 1977) which is executed on a year 186SL094630221 of apparently good data for a given station. The Predicted 186SL094630222 Tide Method for filling gaps consists of statistically 186SL094630223 comparing the predicted tides to the observed data and 186SL094630224 shifting the predicted tides in time to correct for timing 186SL094630225 differences. Then the linear interpolation between hourly 186SL094630226 values at the end points of the gap in the residual series is 186SL094630227 added to the corresponding corrected predicted tide data to 186SL094630228 obtain interpolated values over the span of the gap. 186SL094630229 186SL094630230 Bloomfield, P., 1976. Fourier Analysis of Time Series: An 186SL094630231 Introduction. New York: John Wiley and Sons. pp 129-137. 186SL094630232 186SL094630233 Foreman, M., 1977. Manual For Tidal Height Analysis and 186SL094630234 Prediction. Institute of Ocean Sciences, Patricia Bay, 186SL094630235 Victoria B.C. Pacific Marine Science Report 77-10. 186SL094630236 186SL09466 19531 99999999999999999999999999999999 2037010 2165000 186SL09466 19532 2195000 2153030 2163000 2120000 2104000 2051000 186SL09466 19541 2058000 2051000 1915000 2000000 1977000 2116000 186SL09466 19542 2190000 2108000 2142000 2095000 2041000 2051000 186SL09466 19551 2001000 1974000 2014000 1927000 2026000 1986000 186SL09466 19552 2128000 2175000 2200000 2167000 2033000 2088000 186SL09466 19561 2033000 1973000 1961000 1997000 2095000 2266000 186SL09466 19562 2203000 2180000 2182000 2113000 2088000 2003000 186SL09466 19571 2032000 2010000 1975000 2038000 2160000 2235000 186SL09466 19572 2329000 2269000 2269000 2224000 2232000 2225000 186SL09466 19581 2260000 2114000 2111000 1993000 2136000 2184000 186SL09466 19582 2230000 2226000 2279000 2175000 2167000 2149020 186SL09466 19591 2140010 2122000 2082000 2076000 2084000 2206000 186SL09466 19592 2158000 2219000 2222000999999999999999999999999 186SL09466 19601 999999999999999999999999999999999999999999999999 186SL09466 19602 999999999999999999999999999999999999999999999999 186SL09466 19611 2088010 2069000 1963000 1955000 2054000 2082000 186SL09466 19612 2220000 2163000 2181000 2123000 2020000 2079000 186SL09466 19621 2042000 1984000 1877000 1958000 2026000 2148000 186SL09466 19622 2172000 2219000 2214000 2167000 2077000 2013000 186SL09466 19631 2039000 1999000 1957000 2024000 2082000 2176000 186SL09466 19632 2262000 2264000 2248000 2162000 2150000 2137000 186SL09466 19641 2115000 2018000 1946040 1957000 1938000 2007000 186SL09466 19642 2153000 2165000 2188000 2112000 2013000 1997000 186SL09466 19651 2057000 2024000 2060000 2052000 2052000 2194000 186SL09466 19652 2239000 2273000 2271000 2177000 2194000 2127000 186SL09466 19661 2205000 2043000 2055000 1936000 2053000 2112000 186SL09466 19662 2169000 2198000 2219000 2128000 2107000 2047000 186SL09466 19671 2103000 2023000 1980000 1935000 2012000 2113000 186SL09466 19672 2185000 2181000 2152000 2088000 2102000 2020000 186SL09466 19681 2067000 2010000 1886000 1952000 2037000 2016000 186SL09466 19682 2148000 2222000 2226000 2248000 2124000 2177000 186SL09466 19691 2151000 2084000 2061000 2118000 2081000 2164000 186SL09466 19692 2229000 2249000 2239000 2165000 2151000 2108000 186SL09466 19701 2096000 2087000 1975000 1938000 2000000 2075000 186SL09466 19702 2146000 2135000 2163000 2111000 2040000 1988000 186SL09466 19711 1970000 2003000 1962000 1978000 2009000 2157000 186SL09466 19712 2176000 2188000 2184000 2181000 2092000 2081000 186SL09466 19721 2097000 2025000 2058000 2001000 2179000 2233000 186SL09466 19722 2313000 2300000 2329000 2267000 2365000 2369000 186SL09466 19731 2220000 2155000 2009000 2071000 2023000 2176000 186SL09466 19732 2203000 2181000 2152000 2087000 2054000 2073000 186SL09466 19741 2034000 2040000 2060000 2027000 2160000 2232000 186SL09466 19742 2245000 2247000 2266000 2131000 2062000 2100000 186SL09466 19751 2070000 2062000 2053000 2013000 2044000 2139000 186SL09466 19752 2187000 2198000 2190000 2113000 2077000 2038000 186SL09466 19761 2097000 2019000 2059000 2025000 2131000 2342000 186SL09466 19762 2338000 2273000 2299000 2210000 2274000 2268000 186SL09466 19771 2187000 2050000 2057000 2025000 2078000 2156000 186SL09466 19772 2256000 2257000 2263000 2265000 2214000 2198000 186SL09466 19781 2173000 2147000 2034000 2022000 1988000 2119000 186SL09466 19782 2204000 2210000 2221000 2187000 2071000 2146000 186SL09466 19791 99999999 2046020 2055000 1994000 2025000 2069000 186SL09466 19792 2200000 2174000 2172000 2187000 2086000 2176000 186SL09466 19801 2163000 2195000 2056000 2065000 2133000 2183000 186SL09466 19802 2261000 2246000 2293000 2122000 2139000 2107000 186SL09466 19811 2122000 2036000 1989000 2072000 2075000 2119000 186SL09466 19812 2225000 2223000 2161000 2271000 2126000 2136000 186SL09466 19821 2070000 2163000 2104000 2153000 2183000 2213000 186SL09466 19822 2322000 2277000 2394000 2393000 2417000 2430000