QUALITY ASSESSMENT OF SEA LEVEL DATA by the UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER JOINT ARCHIVE FOR SEA LEVEL Station : Muscat-A Latitude: 23 37.7N Country : Oman Longitude: 058 33.9E JASL # : 110A Time Meridian: 060E (GMT + 4 hr) GLOSS # : none TOGA #: I016 NODC #: 12053801 Contributor : UH Sea Level Center 1000 Pope Rd. MSB 317 Honolulu, Hawaii 96822 Originator : UH Sea Level Center in collaboration with Director of Meteorology CIVAIR SEEB International Airport P. O. Box 204 Muscat, Sultanate of Oman Original Data: analog (L&S); digital (F&P) Instrmnt Type: (04/1987-07/1989) Leupold and Stevens Analog gauge; (08/1989-present) Fischer and Porter Analog-to- Digital Recorder, model 1551 Digitzd Intvl: hourly (L&S); 15 minutes (F&P) Present Data : Hourly, daily, and monthly values obtained by: Hourly : Original data were spot hourly (L&S); A three- point Hanning filter centered on the hour (F&P) 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 : 03 Apr 1987 - 12 Aug 1993 Gaps > 1 mon : 02 Oct - 27 Nov 1987; 18 Aug - 08 Oct 1990 23 Jan - 25 Nov 1992; 02 Jan - 06 Mar 1993 Time Refernce: GMT (hours 00-23) Space-filler Flag :-9999 Units : millimeters Missing Data Flag : 9999 Existing : Yes Operational : Yes Sat. Trans. : No Distribution : 1987-1993 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 values do not reveal any obvious reference level shifts or trends. The analog hourly data contain many timing errors as noted below under questionable fluctuations. The accuracy of the timing improves significantly in 1991. The station was destroyed in 1999. A new station was established in 2009 (110B), though historic benchmarks were not recoverable, so the series 110A and 110B have unique reference zeros. CI MISSING REPLACED GAPS QUESTIONABLE YEAR (%) DATA OR BAD DATA FLUCTUATIONS ---- --- -------------------- --------------- -------------------- 1987 54 150-153,159-163, (01)156-(17)156 131,139-140,149-150, 177-179,217-222, (12)163-(23)163 153,169,171,197-199, 275-332,344-346, (11)234-(06)235 204-205,211-212,214- 356-359 (12)247-(03)248 217,225-230,233,237- (02)336-(23)336 243,245-274,332-335, 339-343,346-356,359- 361,364 1988 100 none (18)043-(03)044 1-11,16-20,22-23,33, (13)055-(04)056 35-37,39,44-47,50- (11)118-(08)119 51,53,60,63-64,68- 69,76-80,92-95,99- 101,103,106-109,125- 126,131-132,134,136- 138,190,143-144,154- 157,159,182,240-242 1989 93 119-121,158-168, none 124-130,136-138,141, 199-213 150,152 1990 83 133-145,231-281 none 1,112,130-131,146- 148,219,222,229-230 1991 98 108-117 none none 1992 16 23-330 none none 1993 44 2-65 none none