QUALITY ASSESSMENT OF SEA LEVEL DATA by the UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER JOINT ARCHIVE FOR SEA LEVEL updated: 13 Nov 2019 Station : Dakar-E Latitude: 14 40.6N Country : Senegal Longitude: 017 25.2W JASL # : 223E Time Meridian: 015W (GMT - 1 hr) GLOSS # : 253 Originator #:7691360 NODC #: 71014702 Contributor : UH Sea Level Center (UHSLC) University of Hawaii at Manoa Honolulu, Hawaii 96822 USA For the pre-1999, station 7691360: National Ocean Service (NOS) National Ocean. and Atmos. Administration (NOAA) N/OES22 SSMC4, STATION 7109 1305 East West Highway Silver Spring, MD. 20910-3233 Originator : same Original Data: digital Instrmnt Type: 1. 1992-2003: Aquatrak acoustic gauge (PWL), NOAA Next Generation Water Level Measuring System; responsibility resumed by UHSLC in 1999 2. 10/2007-: radar gauge (RAD) (Vega Vegapuls 62) 3. 10/2007-: pressure transducer (PRS) backup Primary channel used in JASL set: 1992-2003: PWL 10/2007-2018: RAD *short gaps in primary channel filled with other channels as available; see UHSLC for specific dates Digitzd Intvl: PWL: 6 min (each sampling is 3-minute ave.) RAD: 3 min, PRS: 2 min Present Data : Hourly, daily, and monthly values obtained by: Hourly : spot sampling on the hour (NOAA); 3-point Hanning filter centered on the hour (UHSLC PWL and RAD) 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 : 15 Mar 1992 - 31 Dec 2018 Gaps > 1 mon : 16 May 1992 - 02 Jul 1992;08 Jun 1995 - 18 Sep 1995 01 Mar 1996 - 31 May 1996;31 Aug 1998 - 31 Oct 1998 07 Jun 2003 - 22 Oct 2007 Time Refernce: GMT (hours 00-23) Space-filler Flag :-9999 Units : millimeters Missing Data Flag : 9999 Existing : Yes Operational : Yes Sat. Trans. : Yes Distribution : 1992-2018 Refernce Levl: The NOAA/NOS data are relative to the Station Datum, or historically called the Datum of Tabulation. The UHSLC data were subsequently linked to the same historic Station Datum. 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 means reveal no apparent reference level changes or trends. Poor timing in July-August 2001 and same months of 2003. The daily values agree well with AVISO altimeter. JASL Nov 2019 update replaces 2016- 05 Sep 2017. CI MISSING REPLACED GAPS QUESTIONABLE YEAR (%) DATA OR BAD DATA FLUCTUATIONS ---- --- -------------------- --------------- -------------------- 1992 55 120-123,137-184,189- (00)096-(23)096 186-189 215,228-246 1993 96 79-90,162-166 none none 1994 94 2-13,262-272 none none 1995 72 159-261 none none 1996 75 61-152 none none 1997 100 none none 231-233 1998 83 243-304 none 121-150,195-199, 237-240 1999 94 216-238 none none 2000 99 97-98 none none 2001 100 none none 197-214 2002 100 none none 202-213 2003 43 159-365 (17)157-(04)158 none 2004 0 1-366 none none 2005 0 1-365 none none 2006 0 1-365 none none 2007 19 1-295 none none 2008 100 none none none 2009 100 none (07)123-(23)123 none (05)227-(13)227 (15)227-(05)228 2010 100 none (12)089-(03)090 none (12)259-(23)259 2011 95 244-246,256-261,268- (23)171-(08)172 none 272,275-279,290-294 (22)172-(08)173 (00)174-(08)174 (00)175-(08)175 (23)175-(08)176 (11)181-(18)181 (20)230-(08)231 (21)231-(11)232 (17)232-(08)233 (20)233-(09)234 (18)234-(07)235 (14)235-(08)236 (22)236-(11)237 (15)237-(07)238 (20)238-(08)239 (14)239-(08)240 (21)240-(07)241 (20)241-(07)242 (13)242-(10)243 (15)243-(08)244 (21)246-(07)247 (22)247-(07)248 (22)248-(09)249 (21)249-(08)250 (19)250-(07)251 (17)251-(07)252 (20)252-(08)253 (21)253-(07)254 (19)254-(09)255 (12)255-(09)256 (19)261-(07)262 (19)262-(08)263 (19)263-(09)264 (19)264-(08)265 (19)265-(08)266 (19)266-(08)267 (18)267-(07)268 (19)272-(11)273 (18)273-(10)274 (18)274-(10)275 (18)279-(08)280 (18)280-(08)281 (18)281-(08)282 (18)282-(08)283 (18)283-(08)284 (18)284-(08)285 (18)285-(08)286 (18)286-(08)287 (18)287-(08)288 (18)288-(08)289 (18)289-(08)290 (18)294-(08)295 (18)295-(09)296 (17)296-(08)297 (18)297-(09)298 (18)298-(08)299 (18)299-(08)300 (18)300-(08)301 (18)301-(08)302 (18)302-(08)303 (18)303-(08)304 (18)304-(08)305 (17)305-(09)306 (18)306-(08)307 (18)307-(08)308 (17)308-(08)309 (18)309-(08)310 (18)310-(08)311 (18)311-(08)312 (18)312-(08)313 (18)313-(08)314 (18)314-(09)315 (17)315-(08)316 (17)316-(08)317 (17)317-(08)318 (17)318-(08)319 (17)319-(08)320 (17)320-(08)321 (12)327-(19)327 (12)335-(20)335 (12)336-(19)336 (17)338-(01)339 (14)340-(21)340 (13)341-(23)341 (15)342-(22)342 2012 100 none none none 2013 100 none (12)174-(23)174 none 2014 99 147-148 none none 2015 100 none none none 2016 96 127-141 (22)124-(10)125 none (20)125-(11)126 (17)126-(13)127 (22)141-(08)142 2017 100 none none none 2018 100 none none none