QUALITY ASSESSMENT OF SEA LEVEL DATA by the UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER JOINT ARCHIVE FOR SEA LEVEL updated: 11 Apr 2019 Station : Kapingamarangi Latitude: 01 05.9N Country : Fed. States Micronesia Longitude: 154 46.6E JASL # : 029A Time Meridian: 165E (GMT + 11 hr) GLOSS # : 117 TOGA #: P037 NODC #: 10151401 Contributor : UH Sea Level Center 1000 Pope Rd. MSB 317 Honolulu, Hawaii 96822 Originator : Dept. of Oceanography University of Hawaii 1000 Pope Rd. MSB 317 Honolulu, Hawaii 96822 Original Data: digital Instrmnt Type: 1. Leupold and Stevens Analog-to-Digital Recorder (ADR) 1978-; 2. (2/1990) Handar Encoder 436A (ENC and ENCB) 3. 6/2014- radar (RAD) gauge (Vega Vegapuls 62) Primary channel used in JASL set: 1978-2/1990: ADR 2/1990-2009: ENC or ENB 6/2014-: RAD *short gaps in primary channel filled with other channels as available; see UHSLC for specific dates Digitzd Intvl: 15 (ADR); 3 or 4 (ENC) min; 15 min ENB 3 min (RAD) Present Data : Hourly, daily, and monthly values obtained by: Hourly : (pre-1987) Nine-point triangular filter centered on the hour with respective periods of the 95, 50, and 5% amplitude point of the filter response at 623.6, 177.0, and 103.7 minutes;(1987+) three-point Hanning filter centered on the hour 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 : 09 Sep 1978 - 10 Dec 2018 Gaps > 1 mon : 17 Feb - 6 May 1980,16 Sep - 12 Dec 1980;30 Mar - 30 Apr 1981; 30 Oct 1982 - 8 May 1983; 19 Jul 2000 - 03 Nov 2000;12 Aug 2009 - 17 Jun 2014 Time Refernce: GMT (hours 00-23) Space-filler Flag :-9999 Units : millimeters Missing Data Flag : 9999 Existing : Yes Operational : Yes Sat. Trans. : Yes Distribution : 1978-2018 Refernce Levl: Heights are referred to the station tide staff zero, which is linked to land-based benchmarks. This reference zero is unique to this station and is not an official datum (chart, national, etc.) and is not relative to local tidal parameters, such as mean lower low water. See the Originators for benchmark descriptions, maps, and the geodetic levelling history. Comment : The daily and monthly means reveal no apparent changes in the reference level and agree with nearest stations Rabaul and Nauru. The daily means and the hourly residuals show significant fluctu- ations with a duration of around a day associated with westerly winds. The timing accuracy is no better than plus or minus 8 minutes prior to 1985. Silting around the stilling wells caused question- able fluctuations during 1987 - 1990. Some minor timing drifts Jan-May 1998. Daily values agree well with AVISO altimeter data 1990-2018. The JASL update of 11 Apr 2019 replaces 01 Jan 2016 - 05 Oct 2017. CI MISSING REPLACED GAPS QUESTIONABLE YEAR (%) DATA OR BAD DATA FLUCTUATIONS ---- --- -------------------- --------------- -------------------- 1978 31 none none 328-332 1979 90 60-88,179-181, none 348-349 292-297 1980 49 48-127,136-148, (04)246-(19)246 237-240 196-198,254-255, 257-258,260-347 1981 90 89-120,336-337, none none 359-361 1982 75 86-87,110-119, none 82-85,99-101,127- 139-147,189-194 128,168-172,229-233, 303-365 286-287,289-290, 302-303 1983 65 1-128 none 132-134,194,248-252, 275-276 1984 100 none none none 1985 97 177-186 none 6-7,54,124-125 1986 99 262-265 none none 1987 98 282-284,288-293 none 29-31,58-62,76-77, 86-87,104-105,114- 120,194-195,221-222, 293-300,305-315, 319-320 1988 100 none none 22,47-51,63-65,75- 78,93-96,103-108, 131-137,159-161,240- 241,267-270,296-297, 323-324 1989 100 none none 258-260,328-329 1990 100 none none 69-71,198-199,232- 236,249-250,261-262, 289,341,360 1991 100 none none none 1992 100 none none none 1993 100 none none none 1994 100 none none none 1995 100 none (11)114-(01)115 none 1996 100 none none none 1997 100 none none none 1998 96 208-222 none none 1999 100 none none none 2000 68 160-163,191-197, none none 201-308 2001 99 220-222 none none 2002 100 none none none 2003 100 none none none 2004 100 none none none 2005 100 none none none 2006 100 none none none 2007 100 none none none 2008 100 none (07)275-(16)275 none 2009 60 177-180,221-365 (11)018-(20)018 none (11)019-(20)019 (13)020-(20)020 (06)038-(20)038 (07)039-(21)039 (12)040-(20)040 (11)086-(20)086 (08)087-(20)087 (09)088-(20)088 (06)091-(20)091 (06)092-(20)092 (09)093-(20)093 (05)095-(20)095 (05)096-(20)096 (06)097-(20)097 (07)098-(19)098 (12)099-(19)099 (09)102-(20)102 (06)103-(20)103 (09)104-(20)104 (11)105-(20)105 (06)106-(20)106 (05)107-(23)107 (07)108-(20)108 (06)109-(20)109 (05)110-(21)110 (06)111-(23)111 (09)112-(21)112 (11)113-(20)113 (15)116-(22)116 (12)119-(20)119 (11)120-(19)120 (12)122-(19)122 (05)123-(20)123 (06)124-(20)124 (09)125-(20)125 (08)126-(19)126 (06)127-(19)127 (11)128-(21)128 (11)129-(20)129 (09)130-(20)130 (10)131-(20)131 (10)132-(20)132 (09)133-(22)133 (10)134-(19)134 (10)135-(19)135 (07)136-(20)136 (07)137-(19)137 (07)138-(20)138 (08)139-(20)139 (08)140-(20)140 (00)141-(23)141 (06)142-(20)142 (07)143-(21)143 (08)144-(19)144 (06)145-(19)145 (06)146-(19)146 (06)147-(22)147 (06)148-(20)148 (07)149-(20)149 (05)150-(21)150 (06)151-(19)151 (07)152-(20)152 (06)153-(20)153 (03)154-(20)154 (04)155-(20)155 (08)156-(21)156 (07)157-(20)157 (06)158-(19)158 (04)159-(19)159 (05)160-(19)160 (05)161-(20)161 (06)162-(19)162 (05)163-(20)163 (05)164-(23)164 (05)165-(21)165 (03)166-(19)166 (03)167-(20)167 (05)168-(23)168 (07)169-(20)169 (06)170-(22)170 (06)171-(19)171 (06)172-(20)172 (02)173-(20)173 (22)173-(20)174 (04)175-(21)175 (07)176-(20)176 (07)180-(20)180 (07)181-(21)181 (01)182-(20)182 (23)182-(20)183 (08)184-(21)184 (07)185-(20)185 (07)186-(20)186 (10)187-(20)187 (09)188-(21)188 (03)189-(20)189 (05)190-(20)190 (05)191-(20)191 (06)192-(20)192 (05)193-(20)193 (03)194-(21)194 (05)195-(20)195 (05)196-(21)196 (07)197-(20)197 (23)197-(20)198 (06)199-(20)199 (08)200-(00)201 (07)201-(20)201 (05)202-(20)202 (06)203-(21)203 (05)204-(00)205 (08)205-(01)206 (07)206-(20)206 (02)207-(00)208 (06)208-(20)208 (07)209-(20)209 (06)210-(23)210 (04)211-(20)211 (05)212-(21)212 (04)213-(21)213 (04)214-(21)214 (05)215-(20)215 (04)216-(20)216 (07)217-(20)217 (06)218-(20)218 (04)219-(20)219 (05)220-(20)220 (07)221-(21)221 (03)222-(20)222 (07)223-(23)223 2010 0 none none none 2011 0 none none none 2012 0 none none none 2013 0 none none none 2014 54 1-168 none none 2015 100 none none none 2016 100 none (07)058-(15)058 none (12)358-(00)359 2017 91 37-38,61-63,68-76, (05)009-(21)009 none 344-365 (06)010-(23)010 (11)011-(23)011 (10)016-(22)016 (08)034-(00)035 (07)035-(00)036 (06)036-(00)037 (05)038-(00)039 (06)039-(01)040 (08)040-(02)041 (07)041-(23)041 (13)042-(00)043 (05)043-(23)043 (08)044-(23)044 (13)045-(00)046 (11)046-(22)046 (09)057-(23)057 (05)058-(01)059 (05)059-(02)060 (04)060-(22)060 (07)063-(22)063 (10)064-(01)065 (13)065-(22)065 (00)066-(23)066 (09)067-(23)067 (05)076-(01)077 (06)077-(00)078 (08)078-(22)078 (14)079-(22)079 (11)084-(21)084 (05)338-(21)338 (10)339-(22)339 (12)340-(22)340 (14)341-(00)342 (07)342-(23)342 (10)343-(22)343 2018 84 1-7,269-270,294-312, (07)007-(02)008 none 314-320,328-333,339- (07)008-(01)009 343 (07)009-(22)009 (11)010-(22)010 (11)011-(22)011 (08)012-(22)012 (16)013-(23)013 (15)015-(22)015 (11)037-(22)037 (13)065-(20)065 (07)069-(21)069 (14)071-(21)071 (23)077-(07)078 (10)078-(06)079 (07)134-(21)134 (03)193-(14)193 (12)194-(23)194 (13)195-(22)195 (21)233-(13)234 (11)251-(21)251 (12)268-(21)268 (06)271-(23)271 (14)272-(22)272 (06)293-(19)293 (15)304-(02)305 (10)320-(21)320 (13)321-(22)321 (00)322-(08)322 (14)322-(23)322 (15)336-(22)336 (14)337-(22)337