QUALITY ASSESSMENT OF SEA LEVEL DATA by the UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER JOINT ARCHIVE FOR SEA LEVEL updated: 19 Sep 2019 Station : Dzaoudzi Latitude: 12 46.9S Country : Mayotte Longitude: 045 15.5E JASL # : 155A Time Meridian: 045E (GMT + 3 hr) GLOSS # : 096 Originator #: 620 NODC #: 31042501 Contributor : Service Hydrographique Et Oceanographique De La Marine Establissement Principal 13 rue du Chatellier, 29200 Brest, Cedex, FRANCE Originator : same Original Data: float: analog; radar: digital Instrmnt Type: 1963-10/2008: float, A.OTT type R16 11/2008- : radar Krohne Optiflex Digitzd Intvl: float: hourly; radar: 10 min Present Data : Hourly, daily, and monthly values obtained by: Hourly : float: spot hourly; radar: simple average of 2 min data at 1 second samples centered on the hour 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 : 17 Oct 1963 - 31 Dec 2018 Gaps > 1 mon : 03 Nov 1963 - 13 Oct 1964;04 Nov 1964 - 10 Jan 1981 25 Feb 1981 - 12 May 1985;29 Apr 1987 - 29 Dec 1989 24 Jul 1992 - 17 Sep 1992;30 Jul 1995 - 03 Nov 1995 22 Dec 1995 - 10 Jul 2006;11 Sep 2006 - 11 May 2008 15 May 2008 - 14 Nov 2008;17 Oct 2009 - 01 Feb 2010 09 Aug 2015 - 15 Nov 2016;03 Oct 2017 - 05 Apr 2018 Time Refernce: GMT (hours 00-23) Space-filler Flag :-9999 Units : millimeters Missing Data Flag : 9999 Existing : Yes Operational : Yes Sat. Trans. : Yes Distribution : 1963-2018 Refernce Levl: Good stability of benchmarks has been noted. Primary benchmark is N-402-BIS, 7.332m above Zero Hydrographique. Comment : The daily and monthly means do not reveal any obvious reference level shifts. The questionable fluctuations in the hourly residuals as noted below appear to be the result of minor timing drifts. The data quality improves in 2006. CI MISSING REPLACED GAPS QUESTIONABLE YEAR (%) DATA OR BAD DATA FLUCTUATIONS ---- --- -------------------- --------------- -------------------- 1963 5 307-265 none 305-307 1964 6 1-307,309-366 none none 1965 0 1-365 none none 1966 0 1-366 none none 1967 0 1-365 none none 1968 0 1-366 none none 1969 0 1-365 none none 1970 0 1-365 none none 1971 0 1-365 none none 1972 0 1-366 none none 1973 0 1-365 none none 1974 0 1-365 none none 1975 0 1-365 none none 1976 0 1-366 none none 1977 0 1-365 none none 1978 0 1-365 none none 1979 0 1-365 none none 1980 0 1-366 none none 1981 13 1-10,56-365 none none 1982 0 1-365 none none 1983 0 1-365 none none 1984 0 1-366 none none 1985 64 none none 133,154-156,365 1986 90 6-11,35-38, none 1,43,57-58,68-71, 208-235 87-88,98-90,115-116, 248-250,287-289,306- 308,340 1987 32 6-9,119-365 none 43-48,58,88-90, 114-119 1988 0 1-366 none none 1989 1 1-363 none none 1990 95 291-299,354-365 none 9-10,44-45,89-90, 110-113,173-178,229- 240,260-264,305-312, 317-321,336-339 1991 99 1-4 none 48-49,131-138 1992 72 63-73,94-110,206-261 none none 342-365 1993 98 290-295,308-310 none 11-15,23-25,170-173, 260-290,344-347 1994 95 98-105,325-336 none 8-11,42-46,203-205 1995 65 54-68,110-118, (08)008-(16)008 14-16,30-32,44-47, 211-307,356-365 87-91,308-314 1996 0 1-366 none none 1997 0 1-365 none none 1998 0 1-365 none none 1999 0 1-365 none none 2000 0 1-366 none none 2001 0 1-365 none none 2002 0 1-365 none none 2003 0 1-365 none none 2004 0 1-365 none none 2005 0 1-365 none none 2006 17 1-191 none none 2007 0 1-365 none none 2008 14 1-132,136-319 none none 2009 70 29-57,101-109,290- none 26-28,232 365 2010 91 1-32 none none 2011 100 none none none 2012 87 67-75,86-114,182- none none 187,251-258 2013 83 25-36,213-236,256- (08)151-(00)152 none 284 2014 100 none (03)264-(00)265 none 2015 57 206-217,221-365 none none 2016 13 1-320 none none 2017 75 276-365 (15)028-(00)029 none 2018 73 1-95,153-155,160-162 none none