QUALITY ASSESSMENT OF SEA LEVEL DATA by the UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER JOINT ARCHIVE FOR SEA LEVEL updated: 22 Sep 2003 Station : Majuro-A Latitude: 07 06.4N Country : Republic of Marshall Is. Longitude: 171 22.4E JASL # : 005A Time Meridian: 180E (GMT + 12 hr) GLOSS # : 112 TOGA #: P043 NODC #: 10177101 Contributor : UH Sea Level Center 1000 Pope Rd. MSB 317 Honolulu, Hawaii 96822 -- for the 1968-1972 data: Latitude: 07 17.0N Longitude 171 083.0E from Scripps Institute of Oceanography University of California at San Diego La Jolla, California Originator : same Original Data: digital (1968-72, unconfirmed) Instrmnt Type: (1968-72 unconfirmed) 1. (Apr 1974-present) Leupold and Stevens Analog-to-Digital Recorder (ADR) with encoder Mod B (ENB) 2. (Aug 1983-present) Handar Encoder (ENC) Primary gauge: ADR: 1974-90, ENC: 1991-1995, ENB: 1996-1999 Digitzd Intvl: 15 (ADR,ENB); 3 or 4 (ENC) minutes; (68-72,unconfirmed) Present Data : Hourly, daily, and monthly values obtained by: Hourly : (1968-72, unconfirmed); UH data as follows, (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; Cosine-Lanczos filter with cutoff of 120 min. (NTF) 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 : 06 Oct 1968 - 31 Dec 1999 Gaps > 1 mon : 21 Dec 1972 - 24 Apr 1974;08 Sep 1974 - 22 Mar 1975 16 Mar - 27 Apr 1979; 31 Mar - 3 Jun 1980 Time Refernce: GMT (hours 00-23) Space-filler Flag :-9999 Units : millimeters Missing Data Flag : 9999 Existing : No Operational : No Sat. Trans. : No Distribution : 1968-1999 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. The 1968-72 data have not been linked to the remaining series with either geodetic leveling or data overlap. However, the long term difference with Kwajalein suggests these two segments at Majuro are on the same level. Use discretion. Series 005A is separate from 005B (National Tidal Facility, Australia) because they are at different locations. Comment : The daily and monthly means reveal no apparent changes in the reference level and agree with Ponape. Timing accuracy was no better than plus or minus 7 minutes prior to 1983. CI MISSING REPLACED GAPS QUESTIONABLE YEAR (%) DATA OR BAD DATA FLUCTUATIONS ---- --- -------------------- --------------- -------------------- 1968 24 none none none 1969 100 none (23)209-(11)210 none (00)211-(10)211 1970 100 none none none 1971 100 none none none 1972 99 366 (03)356-(02)357 none 1973 0 1-365 none none 1974 37 251-365 none none 1975 72 1-81,105-120, none 84-85,88-89,98-99, 126-129,258-259 102,145-146,175, 188-192 1976 97 255-257,266-270, none 1-4,16-17,47-49,161- 306-308 165,180,190-196,237- 242,254,282,353-362 1977 100 none none 18-23,32-40,79-85, 89-90,121-126,136- 142,147-151,179-181, 208-213,238-241,269- 272,283-288,295-304, 363 1978 97 60-69 none 8-12,21-24,35-40,52- 55,71-73,244-249, 302-305,315-323,329- 335,344-352,362-365 1979 86 75-117,262-269 none 1-3,9-11,56-63,142- 145,172-178,229,365 1980 82 91-155 none 1-3,27-35,43-51,59- 68,73-80 1981 100 none none 64-70,75-84,179-183, 198-199,209-215,239- 244,268-273,297-303, 314-318 1982 99 166-167 none 7-11,25,37-41,66-71, 229-233,289-291, 317-319 1983 100 none none 1-5,25-34,43-49,55- 61,84-89 1984 100 none none none 1985 100 none none none 1986 100 none none none 1987 100 none none none 1988 92 6-11,339-365 none 48-50,61-65,77-80, 268-269,300-302 1989 100 none none none 1990 100 none none none 1991 100 none none none 1992 100 none none none 1993 100 none none none 1994 100 none none none 1995 100 none none none 1996 100 none none none 1997 100 none none none 1998 100 none none none 1999 100 none none none