186SL0801131125801 165A 19840808 19931231 1527S 12806E 2 00000R 0000 MM 186SL0801231125801 Wyndham Australia The National Tidal Facility 186SL080130001 186SL080130002 QUALITY ASSESSMENT OF SEA LEVEL DATA 186SL080130003 by the 186SL080130004 TOGA SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER 186SL080130005 JOINT ARCHIVE FOR SEA LEVEL 186SL080130006 186SL080130007Station : Wyndham Latitude: 15 27.0S 186SL080130008Country : Australia Longitude: 128 06.0E 186SL080130009JASL # : 165A Time Meridian: 120E (GMT + 8 hr) 186SL080130010GLOSS # : none TOGA #: none NODC #: 31125801 186SL080130011Contributor : The National Tidal Facility 186SL080130012 Flinders University of South Australia 186SL080130013 GPO Box 2100 186SL080130014 Adelaide, 5001, South Australia 186SL080130015 AUSTRALIA 186SL080130016Originator : same 186SL080130017Original Data: digital 186SL080130018Instrmnt Type: float and well 186SL080130019Digitzd Intvl: 15 minute 186SL080130020Present Data : Hourly, daily, and monthly values obtained by: 186SL080130021 Hourly : cubic fit to 15 minute observations 186SL080130022 Daily : 119-point convolution filter (Bloomfield, 1976) 186SL080130023 centered on noon applied to the hourly data 186SL080130024 with respective periods of the 95, 50, and 5% 186SL080130025 amplitude points at 124.0, 60.2, and 40.2 hours 186SL080130026 Monthly: Simple average of all daily values; calculated if 186SL080130027 7 or fewer days are missing 186SL080130028Span of data : 08 Aug 1984 - 31 Dec 1993 186SL080130029Gaps > 1 mon : none 186SL080130030Time Refernce: GMT (hours 00-23) Space-filler Flag :-9999 186SL080130031Units : millimeters Missing Data Flag :99999 186SL080130032Refernce Levl: The sea level heights are referred to the zero 186SL080130033 point assigned to the tide staff. Bench mark 186SL080130034 information is available upon request from the 186SL080130035 contributors. 186SL080130036Comment : The residuals (observed data minus predicted tides) 186SL080130037 are very noisy, probably due to shallow water and 186SL080130038 complex coastal geometry effects that are not 186SL080130039 resolved by the harmonic analysis. The hourly 186SL080130040 data may also contain periods with timing errors 186SL080130041 which are not offset by increments of one hour; 186SL080130042 however, these periods are not identifiable due to 186SL080130043 the large fluctuations in the residuals from the 186SL080130044 unresolved harmonic analysis. Otherwise, 186SL080130045 the daily and monthly values do not reveal any 186SL080130046 obvious reference level shifts and agree well 186SL080130047 with the nearest station, Darwin. 186SL080130048 186SL080130049 SPECIAL NOTE FROM THE DATA CONTRIBUTORS: 186SL080130050 186SL080130051 Supply of sea level data subject to the following 186SL080130052 conditions: 186SL080130053 186SL080130054 i) When any data supplied by the National Tidal 186SL080130055 Facility is used in any publication or report, the 186SL080130056 origin of such data shall be acknowledged in that 186SL080130057 publication or report in the following approved 186SL080130058 form:-- 186SL080130059 186SL080130060 "Tidal {predictions) for {port} {are} supplied 186SL080130061 {constants} {station} {is} 186SL080130062 {material} {...} 186SL080130063 186SL080130064 by the National Tidal Facility, The Flinders 186SL080130065 University of South Australia, Copyright reserved." 186SL080130066 186SL080130067 ii) All material is supplied in good faith and is 186SL080130068 believed to be correct. It is supplied on the 186SL080130069 condition that no warranty is given in relation 186SL080130070 thereto, that no responsibility or liability for 186SL080130071 errors or omissions is, or will be, accepted and 186SL080130072 that the recipient will hold the Flinders Univer- 186SL080130073 sity of South Australia and the National Tidal 186SL080130074 Facility free from all such responsibility or 186SL080130075 liability and from all loss or damage incurred as 186SL080130076 a consequence of any error or omission. 186SL080130077 186SL080130078 iii) The acceptance of material and computations 186SL080130079 from the National Tidal Facility of the Flinders 186SL080130080 University of South Australia will be deemed to 186SL080130081 include acceptance of the conditions of supply. 186SL080130082 186SL080130083 CI MISSING REPLACED GAPS QUESTIONABLE 186SL080130084YEAR (%) DATA OR BAD DATA FLUCTUATIONS 186SL080130085---- --- -------------------- --------------- -------------------- 186SL0801300861984 40 none none see comment above 186SL0801300871985 97 47-51,231-236 none see comment above 186SL0801300881986 96 112-126 (19)300-(11)301 see comment above 186SL0801300891987 100 none none see comment above 186SL0801300901988 95 91-97 (12)278-(00)279 see comment above 186SL080130091 257-263 186SL0801300921989 98 1-9 none see comment above 186SL0801300931990 98 none (18)120-(03)121 see comment above 186SL080130094 (08)189-(02)190 186SL0801300951991 94 1-2,4-7,48-56,109- none see comment above 186SL080130096 113,120-127,158-161, 186SL080130097 365 186SL0801300981992 98 9-14,346-349 none see comment above 186SL0801300991993 83 28-33,54-61,82-111, none see comment above 186SL080130100 309-312,332-350 186SL080130101 186SL080130102 QUALITY ASSESSMENT POLICY 186SL080130103 186SL080130104 The quality assessment is mostly based on the residuals 186SL080130105 (observed data minus predicted tides) of the hourly data. This 186SL080130106 assessment also applies to the daily and monthly data since 186SL080130107 they were derived from the quality-controlled hourly data. 186SL080130108 186SL080130109 The following abbreviations are used in the assessment: 186SL080130110 JASL - Joint Archive for Sea Level; GLOSS - Global Sea Level 186SL080130111 Observing System; TOGA - Tropical Ocean Global Atmosphere 186SL080130112 research program; NODC - National Oceanographic Data Center; 186SL080130113 Instrmnt - instrument; Digitzd Intvl - digitized interval; 186SL080130114 Gaps > 1 mon - missing data in a span greater than one month; 186SL080130115 Refernce - reference. 186SL080130116 186SL080130117 The following corrections are made to the hourly data 186SL080130118 prior to this assessment: 186SL080130119 1) Gaps or obviously wrong data points in a span less than 186SL080130120 25 hours are filled by the predicted tide method*. 186SL080130121 2) Timing errors of exact increments of an hour are corrected 186SL080130122 by shifting the data. 186SL080130123 3) Reference level shifts are only corrected after information 186SL080130124 from tide staff readings or comparative readings with a fixed 186SL080130125 bench mark are checked to verify that the shift was not a 186SL080130126 natural event. If comparative readings are missing or 186SL080130127 incomplete, comparisons of the data with nearby stations 186SL080130128 may warrant the adjustment of some obvious shifts. 186SL080130129 4) Data with unresolved datum shifts are not disseminated. 186SL080130130 However, if sufficient time spans of data are available before 186SL080130131 or after the year(s) with the unresolved shift(s), a subset of 186SL080130132 quality assured data is made available. Thus, the Span field 186SL080130133 in the Quality Assessment may not match the span of the 186SL080130134 distribution data set. As the questionable datum shifts are 186SL080130135 resolved, the data set will be updated. Although this policy 186SL080130136 adds some complexity, it allows more rapid dissemination of 186SL080130137 at least the quality assured years. 186SL080130138 186SL080130139 For each year, the following information is documented from 186SL080130140 the quality-controlled hourly data with dates given as the nth 186SL080130141 day of the year starting from 1 January: 186SL080130142 1) a Completeness Index (CI) based on the percentage of hours 186SL080130143 with available data, 186SL080130144 2) a list of gaps longer than a day, 186SL080130145 3) a summary of days with consecutive missing or obviously 186SL080130146 wrong data in a time span longer than 6 but less than 25 186SL080130147 hours that have been replaced, with hours in parentheses, and 186SL080130148 4) a summary of days with questionable fluctuations in the 186SL080130149 residual series. Fluctuations within the residuals are 186SL080130150 considered significant and are noted if they are greater than 186SL080130151 25 cm. This policy has changed slightly as of October 1992: 186SL080130152 only suspicious fluctuations due to obvious instrumentation 186SL080130153 problems are noted. Minor timing drifts are no longer 186SL080130154 included in the list of questionable days. 186SL080130155 186SL080130156 Note : If the predicted tides poorly model the observed heights 186SL080130157 due to the inability of the tidal analysis to completely resolv 186SL080130158 the non-linear shallow water effects, the residuals are not 186SL080130159 suitable for assessing the data quality. Instead, a subjective 186SL080130160 comment on the quality of the data is provided. 186SL080130161 186SL080130162 *The predicted tides are obtained with the use of a harmonic 186SL080130163 analysis program (Foreman, 1977) which is executed on a year 186SL080130164 of apparently good data for a given station. The Predicted 186SL080130165 Tide Method for filling gaps consists of statistically 186SL080130166 comparing the predicted tides to the observed data and 186SL080130167 shifting the predicted tides in time to correct for timing 186SL080130168 differences. Then the linear interpolation between hourly 186SL080130169 values at the end points of the gap in the residual series is 186SL080130170 added to the corresponding corrected predicted tide data to 186SL080130171 obtain interpolated values over the span of the gap. 186SL080130172 186SL080130173 Bloomfield, P., 1976. Fourier Analysis of Time Series: An 186SL080130174 Introduction. New York: John Wiley and Sons. pp 129-137. 186SL080130175 186SL080130176 Foreman, M., 1977. Manual For Tidal Height Analysis and 186SL080130177 Prediction. Institute of Ocean Sciences, Patricia Bay, 186SL080130178 Victoria B.C. Pacific Marine Science Report 77-10. 186SL080130179 186SL08016 19841 999999999999999999999999999999999999999999999999 186SL08016 19842 9999999999999999 4269000 4284000 4318000 4314000 186SL08016 19851 4332000 4373050 4360000 4330000 4265000 4118000 186SL08016 19852 4079000 4133060 4176000 4247000 4290000 4298000 186SL08016 19861 4428000 4440000 444200099999999 4242060 4178000 186SL08016 19862 4116000 4076000 4133000 4180000 4231000 4240000 186SL08016 19871 4274000 4410000 4375000 4306000 4180000 4078000 186SL08016 19872 4039000 4002000 4061000 4124000 4199000 4266000 186SL08016 19881 4278000 4327000 4346010 4279050 4263000 4136000 186SL08016 19882 4111000 4156000 4255000 4329000 435300099999999 186SL08016 19891 99999999 4433000 4469000 4445000 4322000 4211000 186SL08016 19892 4180000 4118000 4211000 4296000 4268000 4265000 186SL08016 19901 4299000 4288000 4290000 4214000 4172000 4068000 186SL08016 19902 4057000 4057000 4099000 4170000 421500099999999 186SL08016 19911 430204099999999 4368000 4367060 4210060 4160030 186SL08016 19912 4113000 4056000 4111000 4158000 4188000 4221000 186SL08016 19921 4183050 4208000 4243000 4265000 4198000 4110000 186SL08016 19922 4031000 4101000 4170000 4233000 4230000 4252030 186SL08016 19931 4213040999999999999999999999999 4177000 4091000 186SL08016 19932 4040000 4066000 4133000 4166000 421907099999999