QUALITY ASSESSMENT OF SEA LEVEL DATA by the UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER JOINT ARCHIVE FOR SEA LEVEL updated: 12 Nov 2019 Station : Lamu-B Latitude: 02 16.3S Country : Kenya Longitude: 040 54.2E JASL # : 149B Time Meridian: 045E (GMT + 3 hr) GLOSS # : none Originator #: 149 NODC #: 30042001 Contributor : UH Sea Level Center 1000 Pope Rd. MSB 317 Honolulu, Hawaii 96822 Originator : UH Sea Level Center in collaboration with Kenya Marine and Fisheries Institute P. O. Box 81651 Mombasa, Kenya Original Data: digital Instrmnt Type: 1. 1995 - Handar Encoder 436-A, ENC 2. 1995 - 2006 Handar Encoder 436-B, ENB 3. 8/2006- radar (RAD) gauge (Vega Vegapuls 62) 4. 8/2006- pressure transducer (PRS) backup Primary channel used in JASL set: 1995-5/2006: (ENC) 6/2006-5/15/2007: (RAD) 5/15/2007-1/28/2009 (PRS) 1/28/2009-2018 (RAD) *short gaps in primary channel filled with other channels as available; see UHSLC for specific dates Digitzd Intvl: 1 hour spot (LS), 15 min (ENO), 3 min (RAD), 2 min (PRS) Present Data : Hourly, daily, and monthly values obtained by: Hourly : three-point filter (Hanning) centered on 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 : 29 Jun 1995 - 31 Dec 2018 Gaps > 1 mon : 11 Nov 2006 - 11 Dec 2006;11 Jul 2008 - 03 Oct 2008 30 Sep 2009 - 04 Nov 2009 Time Refernce: GMT (hours 00-23) Space-filler Flag :-9999 Units : millimeters Missing Data Flag : 9999 Existing : Yes Operational : Yes Sat. Trans. : Yes Distribution : 1995-2018 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. The site is not linked to the original Lamu station (1989-1991), which was less than a mile away. Comment : Lamu-A and Lamu-B are separated because they do not relate to the same reference zero. Numerous daily short gaps 2004 onward though especially gappy Feb-Nov 2010. JASL Nov 2019 update replaces 2016- 05 Sep 2017. CI MISSING REPLACED GAPS QUESTIONABLE YEAR (%) DATA OR BAD DATA FLUCTUATIONS ---- --- -------------------- --------------- -------------------- 1995 51 none none none 1996 100 none none none 1997 100 none none none 1998 100 none none none 1999 100 none none none 2000 100 none (18)334-(12)335 none 2001 100 none none none 2002 100 none (11)185-(22)185 none (13)283-(10)284 (11)331-(07)332 (22)363-(09)364 (13)364-(01)365 2003 100 none (07)134-(19)134 none (06)137-(19)137 2004 99 207-209 (11)091-(21)091 none (23)091-(09)092 (11)097-(22)097 (15)100-(23)100 (11)101-(23)101 (23)105-(09)106 (12)106-(05)107 (06)108-(19)108 (21)108-(20)109 (07)110-(18)110 (20)110-(19)111 (14)113-(23)113 (02)114-(09)114 (18)114-(05)115 (22)148-(06)149 (07)197-(14)197 (10)204-(19)204 (07)209-(14)209 (03)211-(10)211 (10)272-(18)272 2005 98 163-164,173-176, (21)116-(04)117 none 179-180 (06)125-(14)125 (09)150-(16)150 (20)153-(09)154 (15)155-(22)155 (06)162-(14)162 (20)162-(13)163 (13)167-(10)168 (11)170-(05)171 (22)171-(07)172 (19)177-(07)178 (14)185-(21)185 (03)186-(11)186 (16)187-(00)188 (16)199-(23)199 (08)212-(19)212 (10)234-(22)234 2006 91 214-217,315-345 (10)065-(08)066 none (05)086-(23)086 (08)174-(15)174 (23)195-(06)196 (14)199-(23)199 2007 100 none none none 2008 77 193-277 none 275-305 2009 100 none (08)036-(00)037 none (07)123-(00)124 (02)360-(00)361 2010 79 104-106,126-130,273- (15)043-(05)044 none 308,314-320,323-355 (17)044-(04)045 (17)045-(04)046 (19)046-(04)047 (19)047-(04)048 (19)048-(05)049 (19)049-(04)050 (19)050-(04)051 (18)051-(04)052 (19)052-(04)053 (18)053-(04)054 (18)054-(05)055 (18)055-(05)056 (18)056-(04)057 (19)057-(05)058 (17)058-(08)059 (18)059-(04)060 (18)060-(04)061 (19)061-(04)062 (18)062-(04)063 (18)063-(04)064 (18)064-(05)065 (18)065-(04)066 (17)066-(04)067 (17)067-(05)068 (18)068-(05)069 (17)069-(04)070 (17)070-(04)071 (17)071-(05)072 (18)072-(05)073 (18)073-(05)074 (16)074-(05)075 (18)075-(04)076 (18)076-(05)077 (17)077-(05)078 (18)078-(04)079 (17)079-(05)080 (18)080-(05)081 (18)081-(05)082 (18)082-(05)083 (17)083-(06)084 (17)084-(05)085 (17)085-(05)086 (16)086-(05)087 (17)087-(04)088 (17)088-(05)089 (12)089-(05)090 (18)090-(05)091 (17)091-(05)092 (19)092-(04)093 (18)093-(05)094 (13)094-(06)095 (17)095-(05)096 (17)096-(05)097 (17)097-(05)098 (17)098-(06)099 (18)099-(04)100 (18)100-(05)101 (18)101-(04)102 (17)102-(04)103 (18)103-(05)104 (16)106-(04)107 (16)107-(04)108 (15)108-(05)109 (17)109-(04)110 (17)110-(04)111 (18)111-(05)112 (18)112-(05)113 (18)113-(04)114 (18)114-(04)115 (18)115-(06)116 (18)116-(10)117 (14)117-(08)118 (15)118-(07)119 (16)119-(04)120 (18)120-(06)121 (17)121-(04)122 (17)122-(06)123 (18)123-(07)124 (15)124-(06)125 (16)125-(05)126 (17)130-(04)131 (18)131-(05)132 (18)132-(04)133 (18)133-(04)134 (18)134-(04)135 (18)135-(04)136 (18)136-(04)137 (18)137-(04)138 (18)138-(04)139 (18)139-(05)140 (18)140-(05)141 (18)141-(04)142 (18)142-(07)143 (15)143-(07)144 (16)144-(04)145 (18)145-(04)146 (17)146-(04)147 (18)147-(06)148 (18)148-(04)149 (17)149-(04)150 (17)150-(04)151 (17)151-(05)152 (16)152-(04)153 (17)153-(04)154 (16)154-(05)155 (17)155-(05)156 (17)156-(05)157 (17)157-(06)158 (16)158-(05)159 (16)159-(07)160 (16)160-(04)161 (16)161-(07)162 (17)162-(04)163 (17)163-(04)164 (17)164-(05)165 (17)165-(04)166 (16)166-(05)167 (16)167-(05)168 (16)168-(05)169 (14)169-(06)170 (15)170-(05)171 (15)171-(05)172 (15)172-(05)173 (15)173-(05)174 (14)174-(05)175 (14)175-(05)176 (14)176-(05)177 (14)177-(05)178 (15)178-(07)179 (12)179-(05)180 (15)180-(05)181 (14)181-(06)182 (13)182-(06)183 (14)183-(05)184 (14)184-(05)185 (15)185-(05)186 (14)186-(05)187 (14)187-(05)188 (13)188-(05)189 (14)189-(06)190 (14)190-(05)191 (14)191-(05)192 (14)192-(05)193 (14)193-(05)194 (14)194-(06)195 (14)195-(06)196 (14)196-(06)197 (14)197-(06)198 (14)198-(06)199 (12)199-(06)200 (14)200-(06)201 (14)201-(05)202 (14)202-(05)203 (14)203-(06)204 (14)204-(05)205 (14)205-(05)206 (14)206-(06)207 (13)207-(07)208 (14)208-(05)209 (14)209-(05)210 (14)210-(05)211 (13)211-(05)212 (14)212-(05)213 (11)213-(07)214 (14)214-(05)215 (14)215-(05)216 (13)216-(07)217 (12)217-(05)218 (14)218-(07)219 (14)219-(05)220 (14)220-(07)221 (12)221-(05)222 (14)222-(05)223 (14)223-(09)224 (12)224-(09)225 (13)225-(05)226 (13)226-(05)227 (13)227-(05)228 (14)228-(06)229 (14)229-(05)230 (14)230-(06)231 (14)231-(05)232 (14)232-(06)233 (14)233-(05)234 (14)234-(06)235 (14)235-(06)236 (13)236-(06)237 (12)237-(06)238 (14)238-(06)239 (14)239-(07)240 (13)240-(07)241 (13)241-(05)242 (14)242-(05)243 (14)243-(05)244 (14)244-(06)245 (13)245-(07)246 (13)246-(06)247 (14)247-(05)248 (14)248-(06)249 (13)249-(05)250 (14)250-(06)251 (14)251-(08)252 (13)252-(05)253 (14)253-(06)254 (13)254-(05)255 (14)255-(05)256 (13)256-(05)257 (13)257-(08)258 (13)258-(05)259 (13)259-(06)260 (13)260-(05)261 (14)261-(06)262 (14)262-(07)263 (13)263-(07)264 (14)264-(07)265 (12)265-(05)266 (13)266-(05)267 (13)267-(06)268 (13)268-(07)269 (13)269-(06)270 (13)270-(06)271 (13)271-(05)272 (13)272-(05)273 (12)308-(07)309 (12)309-(09)310 (12)310-(07)311 (12)311-(08)312 (10)312-(07)313 (12)313-(08)314 (11)320-(09)321 (12)321-(08)322 (12)322-(08)323 2011 99 41-42,289-291 (11)181-(19)181 none (23)285-(22)286 (15)287-(23)287 (02)288-(09)288 (12)288-(19)288 (21)288-(05)289 (07)289-(18)289 (10)297-(18)297 (04)299-(11)299 2012 100 none none none 2013 100 none (13)174-(23)174 none 2014 100 none (18)033-(08)034 none (19)060-(02)061 2015 100 none (18)018-(03)019 none (20)019-(04)020 2016 100 none none none 2017 100 none (19)041-(05)042 none (22)042-(05)043 (18)043-(06)044 (16)044-(06)045 (16)045-(04)046 (18)046-(05)047 (19)047-(05)048 2018 100 none (15)192-(08)193 none