QUALITY ASSESSMENT OF SEA LEVEL DATA by the UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER JOINT ARCHIVE FOR SEA LEVEL update: 09 Jan 2018 Station : Rodrigues Latitude: 19 40.1S Country : Mauritius Longitude: 063 25.1E JASL # : 105A Time Meridian: 060E (GMT + 4 hr) GLOSS # : 019 Originator #: 105 NODC #: 31069301 Contributor : UH Sea Level Center 1000 Pope Rd. MSB 317 Honolulu, Hawaii 96822 Originator : UH Sea Level Center in collaboration with Meteorological Services Vacoas, Mauritius Indian Ocean Original Data: analog (LS); digital (ENC/ENB) Instrmnt Type: 1) Leupold and Stevens (LS), model A-71, 2) Handar 436-A, Encoder (ENC), 3) Handar 436B3 (ENB) with datalogger (ENO) 4) 5/2008- radar (RAD) gauge (Vega Vegapuls 62) 5) 4/2005- pressure transducer (PRS) backup 6) 4/2005- Sutron Stage Discharge Recorder (SDR) encoder, float/well Primary channel used in JASL set: 1986-1992: (LS) 1993-1996,1999,2001-2008: (ENC) 1997-1998,2000: (ENB) 2009-2012: RAD (gaps filled with SDR) 1/2013-10/2013: ENC 11/2013-12/2013: ENB 2014-: RAD *short gaps in primary channel filled with other channels as available; see UHSLC for specific dates Digitzd Intvl: one hour (LS); 4 min (ENC); 15 min (ENB,ENO); 3 min (RAD, PRS) Present Data : Hourly, daily, and monthly values obtained by: Hourly : The original digitizing interval was hourly (LS); three-point hanning filter centered on the hour (ENC and ENB). 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 : 08 Nov 1986 - 05 Sep 2017 Gaps > 1 mon : 22 Aug - 02 Oct 1987; 30 Sep - 07 Nov 1988; 30 Oct - 06 Dec 1989; 01 Apr - 12 May 1990 Time Refernce: GMT (hours 00-23) Space-filler Flag :-9999 Units : millimeters Missing Data Flag : 9999 Existing : Yes Operational : Yes Sat. Trans. : Yes Distribution : 1986-2017 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 : Timing errors are evident in the hourly data, especially during 1987. Excessive daily short gaps 28 Jun - 06 Sep 2011. Daily data difference with AVISO altimeter suggests ~5 cm reference level shift in October 2013. The difference with Port Luis, Mauritius is less conclusive. CI MISSING REPLACED GAPS QUESTIONABLE YEAR (%) DATA OR BAD DATA FLUCTUATIONS ---- --- -------------------- --------------- -------------------- 1986 15 none none 318-323 1987 88 234-275,364-365 (05)076-(00)077 43-44,49-50,66,71- (12)173-(03)174 73,77-80,83-92,94- 95,97-101,105-106, 119-120,128,130,133- 135,145-148,163,165, 192-193,213,219-228, 276-277,290-294,299, 320-321,326,339-341 1988 82 4-11,137-152, none 3-4,36-38,40,42,51- 274-312,352-359 55,61,69,93-94,98- 99,266-267,316-319, 329-330 1989 88 168-171,207-212, none 34-36,62,95-96,115- 303-340 117,124,154-155,191- 192,198,204,226,245- 246,258-262,272-276 1990 86 79-86,91-132, none 263,293-294 264-269 1991 100 none none 20,117-118,284-286 1992 96 92-93,128-129, none none 240-251 1993 100 none none none 1994 100 none none none 1995 100 none none none 1996 99 363-365 none none 1997 100 none none none 1998 100 none none none 1999 100 none none none 2000 100 none none none 2001 100 none none none 2002 99 345-347 (03)337-(10)337 none 2003 100 none (15)091-(03)092 none (22)130-(10)131 (17)219-(00)220 (16)284-(00)285 2004 98 207-209,361-366 none none 2005 92 1-24,97-99,173-176 (14)167-(11)168 none (11)170-(00)171 (23)177-(07)178 (14)179-(23)179 (16)199-(23)199 (11)234-(23)234 (17)259-(03)260 (16)261-(03)262 (16)283-(03)284 (18)325-(02)326 2006 99 23-25,178-180 (19)082-(05)083 none (06)086-(23)086 (10)165-(19)165 2007 100 none none none 2008 100 none (05)068-(15)068 none 2009 100 none (07)123-(23)123 none 2010 100 none (12)089-(03)090 none (00)335-(07)335 2011 99 45-48 (16)248-(09)249 none 2012 99 134-135 none none 2013 100 none (03)048-(11)048 none (14)048-(22)048 (12)174-(23)174 (06)289-(15)289 (10)344-(17)344 (11)345-(18)345 2014 99 134-135 (02)035-(12)035 none (17)093-(04)094 (15)094-(03)095 (17)095-(02)096 (17)096-(02)097 (16)097-(02)098 (16)098-(04)099 (11)099-(04)100 (13)113-(04)114 (14)121-(03)122 (08)122-(05)123 (19)163-(03)164 (16)173-(03)174 (14)174-(04)175 2015 100 none none none 2016 100 none none none 2017 68 none none none