QUALITY ASSESSMENT OF SEA LEVEL DATA by the UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER JOINT ARCHIVE FOR SEA LEVEL updated: 08 Aug 2003 Station : Honolulu-A,Hawaii Latitude: 21 18.3N Country : USA Longitude: 157 51.8W JASL # : 057A Time Meridian: 150W (GMT - 10 hr) GLOSS # : 108 Originator #:1612340 NODC #: 72151701 Contributor : 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 : US Coast and Geodetic Survey Original Data: analog Instrmnt Type: standard mechanical gauge, Stierle self-registering tide gauge made by Hugo Bilgrim of Philadelphia, No. 37, scale 12. Digitzd Intvl: hourly Present Data : Hourly, daily, and monthly values obtained by: Hourly : spot sampling 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 : 21 Jun 1877 - 13 Jul 1892 Gaps > 1 mon : 11 Nov 1878 - 07 Sep 1879;08 Jul 1880 - 19 Aug 1880 03 Dec 1880 - 01 Aug 1881;20 Jul 1882 - 17 Jun 1891 Time Refernce: GMT (hours 00-23) Space-filler Flag :-9999 Units : millimeters Missing Data Flag : 9999 Existing : No Operational : No Sat. Trans. : No Distribution : 1877-1892 Refernce Levl: All heights have been referred to the station tide staff zero which is linked to fixed bench marks. This series is separate from Honolulu-B because they have not been linked to the same datum. Analysis of tide staff comparison sheets led to the following adjustments: 21 Jun 1877 - 31 Dec 1877 -1402 mm 01 Jan 1878 - 31 Aug 1878 -244 mm Notes from historic sheets: The standard bench mark for the City is the top of pediment of plaster of the main entrance to the large Government Building (Aliiolani) at the left hand side on entering. In the City levels this was taken as 16.50 feet above assigned mean sea level, and as this latter was callled 10 on tidal sheets in order to avoid negative numbers, it is 26.50 feet above the zero of the sheets. 10 feet or assumed MSL = City Datum. A bench mark was made on the edge of the wharf the elevation of which is given as 13.08, 13.02, and 12.99 feet above zero of the sheets. The distance from this BM to the water surface was measured each day as a check on the workings of the box gauge, referred to as the staff on the sheets. The hydrographic work the plane of reference was taken as one foot below the City plane of assumed MSL, that is, as 9 feet above the zero of the sheets, and the box gauge reading corresponding to this plane was 7.32 feet. In this work, 9 feet of the sheets is taken as zero, so that the heights are one foot more than reckoned from the plane of reference, which was assumed to be the mean of the lower mean water. Comment : A timing offset of -30 minutes exists in the hourly since the time zone in Hawaii (mean local civil time) was GMT-10.5. The daily means show anomalously high levels in May - July 1882. Analysis of tide comparisons could not detect evidence of a level shift. CI MISSING REPLACED GAPS QUESTIONABLE YEAR (%) DATA OR BAD DATA FLUCTUATIONS ---- --- -------------------- --------------- -------------------- 1877 53 none none none 1878 88 243-250,328-365 (00)001-(09)001 none (09)019-(20)019 none (19)076-(04)077 (17)078-(02)079 (06)284-(17)284 (09)285-(18)285 (17)299-(01)300 (04)303-(19)303 1879 80 1-32,66-68,80-82, (10)049-(18)049 none 142-145,325-327 (04)097-(17)097 (05)098-(17)098 (06)099-(18)099 (08)105-(01)106 (07)114-(18)114 (04)119-(19)119 (06)127-(17)127 (19)140-(17)141 (05)146-(17)146 (07)157-(17)157 (08)158-(01)159 (03)181-(17)181 (06)185-(18)185 (07)188-(17)188 (04)214-(18)214 (05)229-(18)229 (04)258-(11)258 (22)264-(16)265 (20)285-(17)286 (14)356-(01)357 1880 76 49-66,190-232,338- (23)027-(18)028 none 366 (04)032-(18)032 (20)074-(19)075 (03)086-(18)086 (09)139-(02)140 (10)160-(09)161 (22)189-(05)190 (06)233-(18)233 (05)235-(19)235 (09)245-(19)245 (18)309-(03)310 1881 27 1-213,225-229,233- (03)242-(19)242 none 235,252-270,291-296, (15)273-(01)274 321-322,325-328,332- (14)323-(02)324 350,353-358 1882 46 29-32,36-45,52-53, (15)012-(02)013 none 76-78,80-89,111-113, (16)018-(02)019 120-121,127-128,158- (12)034-(20)034 159,177-178 (18)070-(01)071 (00)099-(22)099 (08)141-(22)141 (21)155-(11)156 (00)193-(10)193 1883 0 1-365 none none 1884 0 1-366 none none 1885 0 1-365 none none 1886 0 1-365 none none 1887 0 1-365 none none 1888 0 1-366 none none 1889 0 1-365 none none 1890 0 1-365 none none 1891 53 1-168,215-217,346- (21)176-(19)177 none 348,361-362 (10)182-(21)182 (23)196-(19)197 (19)198-(15)199 (19)199-(18)200 (05)214-(18)214 (00)215-(18)215 (19)235-(18)236 (19)259-(18)260 (09)291-(18)291 (19)303-(18)304 (06)355-(18)355 1892 53 none (19)052-(18)053 none (04)147-(18)147 (19)154-(18)155 (19)176-(18)177 (03)182-(18)182