QUALITY ASSESSMENT OF SEA LEVEL DATA by the UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER JOINT ARCHIVE FOR SEA LEVEL Station : San Jose Latitude: 13 55.0N Country : Guatemala Longitude: 090 50.0W JASL # : 675A Time Meridian: 090W (GMT - 6 hr) GLOSS # : none TOGA #: none NODC #: 71093002 Contributor : Oregon State University College of Oceanography Corvallis, Oregon 97331 Originator : Instituto Nacional de Meteorologia y Hidrologia 7A Avenida 14-57 Zona 13 Guatemala, C.A. GUATEMALA Original Data: analog Instrmnt Type: standard float and well gauge Digitzd Intvl: hourly Present Data : Hourly, daily, and monthly values obtained by: Hourly : original digitized interval was hourly 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 Jan 1955 - 25 Sep 1975 Gaps > 1 mon : 03 May 1965 - 12 Jun 1965;01 Jan 1970 - 31 Dec 1970 Time Refernce: GMT (hours 00-23) Space-filler Flag :-9999 Units : millimeters Missing Data Flag : 9999 Existing : No Operational : No Sat. Trans. : No Distribution : 1955-1975 Refernce Levl: The data have been linked to tide staff zero by the contributors. However, further analysis of the data has led to adjustments of the reference level in separate segments. All suspected shifts showed step function jumps in the plots of hourly residuals and of differences of daily values with the nearest stations. These ad- justments contain uncertainty to a few centimeters. period value added ( (hour)day/month/year ) to original(mm) ----------------------------- --------------- (00)01/01/1955-(05)01/10/1955 180 (06)01/10/1955-(20)02/03/1956 -100 (21)02/03/1956-(17)07/08/1956 180 (18)07/08/1956-(05/01/01/1957 340 (06)01/01/1957-(22)31/05/1957 200 Comment : The level stability of this series is questionable. Differences of daily means with adjacent sites shows subtle deviations. 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 ---- --- -------------------- --------------- -------------------- 1955 96 1,204-211,337-344 none 259-260,290 1956 94 232-239,260-267, none none 288-295 1957 98 43-50,151-154 (03)313-(15)313 none (02)325-(17)325 (03)361-(22)361 1958 100 none (07)056-(19)056 37-38,44-46 (17)211-(03)212 1959 100 none (06)317-(23)317 305-307 1960 100 none (16)007-(07)008 none (02)341-(22)341 1961 96 162-169,260-267 none none 1962 98 176-182 (06)275-(05)276 none (15)294-(05)295 (07)316-(16)316 1963 100 none (22)021-(12)022 26-29 (04)023-(11)023 (16)023-(23)023 (01)213-(11)213 1964 99 210-214 (09)026-(19)026 none 1965 87 96-103,123-163 (03)016-(16)016 92-93,282,336 (17)032-(15)033 (06)219-(13)219 (16)221-(06)222 (21)231-(05)232 1966 100 none none none 1967 100 none none 87-91,108,166,338- 339,354-355 1968 100 none (07)100-(16)100 none (20)219-(17)220 (21)305-(23)305 (01)306-(23)306 1969 100 none (17)007-(10)008 74 (13)024-(00)025 (12)339-(04)340 1970 0 1-365 none none 1971 99 1 none 166-167,235-239 1972 97 117-127 none 48-49 1973 100 none (15)187-(00)188 273 1974 93 32-40,125-137, none none 346-351 1975 73 none none 55