BODC FIXED STATION DOCUMENT NO. 57529 Site History : Mombasa, Kenya ============================= Station : Mombasa Latitude: 04 04.2S Country : Kenya Longitude: 039 39.4E GLOSS No : 008 Time Reference: GMT (hours 00-23) Contributor : UH Sea Level Center in collaboration with Kenya Marine and Fisheries Institute Instrument Type : Leupold and Stevens, model A-71, float gauge Site of Gauge : The gauge is situated between Telegraph Point and the yacht club at Ras Liwotoni. Observational periods: 1986 - present Reference Level: All heights have been referred to the station tide gauge zero which is linked to fixed benchmarks. Tide gauge benchmark (TGBM) description: BM@ is a bolt fixed on the tide staff at 3.8m above tide staff zero. Auxiliary benchmarks: BM1 (TGZ is 5.683m below BM1 - June 1989). BM2 (TGZ is 5.850m below BM2 - June 1989). BM3 (TGZ is 13.883m below BM3 - April 1987). BM N-3 (TGZ is 6.226m below TGZ - June 1989). Benchmark relationships: Tide gauge zero (TGZ) = Admiralty Chart Datum - 0.942 m. TGZ = East African Railways Datum - 0.912 m. TGZ = Survey of Kenya Datum - 2.790 m (from 1989). TGZ = 3.800m below BM@. Quality Assessment by the UH Sea Level Center: Comment: The daily and monthly means do not reveal any reference level shifts and agree well with an adjacent station, Zanzibar, except for about a 10 day period of 9-20 Feb 1990 when the daily values show a suspicious drop. Another suspicious rise occurs on 14-17 June 1990. These features are not identifiable in the tide staff observations. The timing of the hourly data is uncertain to about 4 minutes for most of the record with periods of less accuracy as noted below under questionable fluctuations. The timing is more accurate beginning in 1992. CI MISSING REPLACED GAPS QUESTIONABLE YEAR (%) DATA OR BAD DATA FLUCTUATIONS ---- --- -------------------- --------------- -------------------- 1986 51 254-258,304-308, (13)216-(00)217 175,214-215,231-233, 333-335,355-357 (15)217-(23)217 260-264,282,317-319, (19)219-(06)220 358-360 (23)222-(08)223 (02)320-(19)320 (01)324-(19)324 1987 78 37-40,130-132, (13)048-(21)048 59-60,67,73-74,80- 147-159,215-222, (17)050-(03)051 84,88-89,91,93,106, 310-365 (20)052-(05)053 134,142-147,168-169, (12)136-(22)136 173,177-178,194-195, (00)137-(10)137 214,222,224,227-228, (18)160-(05)161 275-278,281 (14)161-(23)161 (04)171-(23)171 1988 93 1-59,94-96, none 79-81,83-84,93-94, 151-154,232-243, 100-103,108-110,129- 245-252,332-335 130,139-142,150-151, 245,268-270,319,337, 344-345 1989 98 104-107,122-124, none 6-7,27,39,66-67,69, 242-244 78-79,87,97-99,126, 137-139,152-162,164, 166,169-178,183-184, 186-191,200-201,213- 214,216-218,228-232, 241,286-291,341-342 1990 75 17-22,53-59, none 10,23,29,40-41,61- 145-150,161-164, 62,66,69-73,84,86- 199-218,226-236, 91,94-95,97,100-106, 255-263,290-292, 117-120,125-126,130- 305-309 131,138-139,150-159, 164-181,187-190,192- 198,237-239,247-152, 275-280,288-290,300- 302,304,309-310,314- 315,318,322-323,327- 328,333 1991 41 1-216 none 221-226,238-241,253- 256 1992 99 11-13 none none 1993 99 151-153,303-304 none none 1994 63 1-46,93-106,118-130, (00)070-(13)070 none 134-138,303-365 1995 50 1-183 none none 1996 100 none none none 1997 45 015-066,099-251 none none 1998 99 309-310,325-327 none none