QUALITY ASSESSMENT OF SEA LEVEL DATA by the UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER JOINT ARCHIVE FOR SEA LEVEL Updated 19 May 2015 Station : Chuuk Latitude: 07 27.0N Country : Fed. States Micronesia Longitude: 151 51.0E JASL # : 054A Time Meridian: 150E (GMT + 10 hr) GLOSS # : 116 Originator #:1840000 NODC #: 10157101 Contributor : National Ocean Service (NOS) National Ocean. and Atmos. Administration (NOAA) SSMC4, STATION 7109 1305 East West Highway Silver Spring, MD. 20910-3233 Originator : same Original Data: analog (standard); digital (ADR and NGWLMS) Instrmnt Type: standard mechanical (1947-1974); analog-to-digital (ADR) recorder (1975-1990); Aquatrak acoustic gauge, NOAA Next Generation Water Level Measuring System (NGWLMS) (1991-) Digitzd Intvl: hourly (standard); six-minute (adr and NGWLMS) NGWLMS sampling is three-minute average Present Data : Hourly, daily, and monthly values obtained by: Hourly : The original digitizing interval was hourly (standard); spot sampling on the hour (adr/NGWLMS) 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 : 01 Oct 1947 - 31 Dec 1991 Gaps > 1 mon : 17 Nov 1947 - 21 Dec 1947;25 Apr 1948 - 03 Oct 1948 26 Dec 1948 - 24 Mar 1949;01 May 1949 - 30 Sep 1949 04 Jun 1951 - 30 Oct 1951;06 May 1955 - 04 Feb 1956 20 Jan 1960 - 05 Mar 1960;30 Jun 1967 - 31 Jul 1967 31 Oct 1976 - 31 Dec 1975;07 Sep 1976 - 23 Oct 1976 01 Nov 1987 - 21 Feb 1988;23 Nov 1990 - 07 Feb 1991 Time Refernce: GMT (hours 00-23) Space-filler Flag :-9999 Units : millimeters Missing Data Flag : 9999 Existing : Yes Operational : Yes Sat. Trans. : Yes Distribution : 1947-1991 Refernce Levl: All heights have been referred to the station tide staff zero which is linked to fixed bench marks. While standard mechanical or ADR instrument was the primary gauge, leveling calibration factors were applied monthly based on tide staff comparisons. Comment : The daily and monthly means reveal no apparent reference level changes or trends. The timing appears to be off by roughly 6 minutes from Sep - Dec 1991. Notable episodic events: 09-10 Mar 1957: Tsunami from C. Aleutians 23-25 May 1960: Tsunami from S.C. Chile 28 Mar 1964: Tsunami from Alaska CI MISSING REPLACED GAPS QUESTIONABLE YEAR (%) DATA OR BAD DATA FLUCTUATIONS ---- --- -------------------- --------------- -------------------- 1947 16 321-355,365 none none 1948 50 1-9,116-277,289-293, (09)282-(23)282 336,353-356 295-299,361-366 (11)080-(23)080 1949 34 1-83,121-273,337-340 (01)336-(00)337 none 357-360,363-365 (13)341-(21)341 (11)360-(02)361 (11)361-(02)362 (07)362-(02)363 1950 92 1-7,16-17,181-184, (16)025-(05)026 146-148 200-202,207-212,220- (19)124-(02)125 222,225-229,236-238, (15)184-(08)185 242-243,266-267, (15)187-(07)188 285-289 (17)188-(01)189 (23)192-(08)193 (01)198-(08)198 (10)198-(03)199 (15)204-(03)205 (15)212-(23)212 (14)224-(21)224 (23)268-(07)269 (22)270-(08)271 (23)273-(23)273 (17)281-(13)282 (13)284-(07)285 1951 60 155-303 (23)051-(06)052 none (14)084-(13)085 (21)119-(06)120 (21)120-(23)120 (22)121-(05)122 1952 35 9-243,259-261, (17)335-(23)335 none 266-268 1953 100 none (14)089-(13)090 none (14)134-(13)135 (14)223-(13)224 (04)313-(20)313 1954 100 none (08)167-(01)168 none 1955 34 126-365 none none 1956 91 1-36 none none 1957 100 none none none 1958 92 336-365 none none 1959 100 none none none 1960 88 20-65 none none 1961 100 none none none 1962 100 none (00)330-(18)330 none 1963 100 none none none 1964 100 none none none 1965 100 none none none 1966 100 none none none 1967 92 181-212 none none 1968 100 none none none 1969 100 none none none 1970 100 none none none 1971 100 none (15)274-(23)274 none (18)349-(10)350 1972 99 161-163 (00)174-(22)174 none 1973 100 none (02)226-(17)226 none (23)227-(09)228 (12)231-(20)231 (07)309-(21)309 (15)326-(22)326 1974 100 none (22)347-(09)348 none (22)348-(12)349 (14)365-(23)365 1975 83 304-365 none none 1976 77 25-49,63-70, (05)251-(13)251 none 72-83,251-297 1977 91 8-10,11-29, none none 49-52,82-91 1978 94 10-12,66-69, (06)046-(05)047 none 92-93,274-286 (01)100-(23)100 (10)106-(21)106 1979 99 37-38,102-105 none none 1980 100 none none none 1981 94 222-243 none none 1982 100 none none none 1983 100 none none none 1984 100 none none none 1985 100 none none none 1986 100 none none none 1987 78 260-265,276-278, none 274-275 305-365 1988 86 1-52 none 330-331 1989 100 none none none 1990 90 327-365 none none 1991 77 1-38,107-127,199- none none 223,245-246,365