QUALITY ASSESSMENT OF SEA LEVEL DATA by the UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER JOINT ARCHIVE FOR SEA LEVEL updated: 15 Aug 2017 Station : Karachi-B Latitude: 24 48.7N Country : Pakistan Longitude: 066 58.5E JASL # : 147B Time Meridian: 075E (GMT + 5.0 hr) GLOSS # : 030 Originator #: NODC #: 12064601 Contributor : National Oceanography Centre Joseph Proudman Building 6 Brownlow Street Liverpool L3 5DA United Kingdom Originator : Pakistan Navy Hydrographic Department Original Data: digital Instrmnt Type: OTT Kalesto radar sensor 2 x OTT ODS4-K pressure sensor (backup) Digitzd Intvl: 1 or 3 min Present Data : Hourly, daily, and monthly values obtained by: Hourly : Data provided to JASL at 15-minute intervals. Spot readings on the hour were made. 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 : 31 Jan 2007 - 15 Dec 2016 Gaps > 1 mon : none Time Refernce: GMT (hours 00-23) Space-filler Flag :-9999 Units : millimeters Missing Data Flag : 9999 Existing : Yes Operational : Yes Sat. Trans. : No Distribution : 2007-2016 Refernce Levl: All data refer to local Chart Datum. Benchmarks Descriptions BM-1 BM-2 BM-3 Main Tide Gauge Benchmark BM-4 BM-5 Old TGBM Old Tide Gauge Benchmark on Manora Island Datum Relationships: TGZ = Chart Datum TGZ = 5.497 below BM-1 TGZ = 5.594 below BM-2 TGZ = 5.094m below BM-3 TGZ = 4.832m below BM-4 TGZ = 4.549m below BM-5 TGZ = 4.392m below Old TGBM Karachi-A appears about 20cm low relative to Karachi-B. It is intended to try to link the two time segments to the same datum. Comment : 1) BODC notes: Amplitudes and phases of main tidal constituents have been compared with previously calculated values. Records have been visually inspected for spikes, datum shifts and timing errors. 2) JASL: gaps 24 hour or less were interpolated at the JASL. The tide gauge is located in Karachi Harbour opposite Manora Island. A storm surge in excess of 1m occurred on 25-26 June 2007 from Cyclone Yemyin. CI MISSING REPLACED GAPS QUESTIONABLE YEAR (%) DATA OR BAD DATA FLUCTUATIONS ---- --- -------------------- --------------- -------------------- 2007 90 120-122,318-319, (16)232-(02)233 none 342-344 2008 98 230-238 (08)178-(16)178 none (08)193-(16)193 (19)210-(02)211 (18)211-(01)212 (08)215-(16)215 (18)215-(02)216 (16)221-(01)222 (08)273-(03)274 2009 100 none none none 2010 99 30-32 (13)060-(04)061 none (13)089-(04)090 (04)247-(11)247 (11)252-(21)252 (08)258-(16)258 (07)259-(16)259 (05)260-(16)260 (06)261-(16)261 (11)264-(06)265 (00)335-(07)335 2011 98 88-94 (19)064-(08)065 none 2012 100 none none none 2013 100 none (09)218-(04)219 none 2014 100 none (20)321-(13)322 none (15)322-(01)323 2015 100 none (16)197-(23)197 none (17)268-(02)269 (14)269-(03)270 (14)270-(03)271 (11)271-(03)272 (10)272-(02)273 (07)275-(21)275 (12)276-(03)277 (13)277-(04)278 (06)278-(22)278 (06)280-(03)281 (14)281-(23)281 (13)282-(02)283 (16)283-(03)284 (21)288-(04)289 (12)289-(02)290 (12)290-(07)291 (12)291-(01)292 (17)292-(04)293 (17)293-(02)294 (16)296-(02)297 (19)327-(06)328 (20)349-(06)350 (01)358-(20)358 (03)359-(16)359 2016 95 263-264 (18)003-(03)004 none (16)004-(02)005 (14)092-(03)093 (15)104-(03)105 (15)105-(02)106 (16)116-(23)116 (15)119-(02)120 (18)120-(02)121 (16)136-(03)137 (14)137-(02)138 (18)141-(03)142 (17)143-(03)144 (18)144-(01)145 (14)145-(03)146 (17)146-(02)147 (16)147-(23)147 (20)148-(03)149 (15)149-(03)150 (15)150-(01)151 (16)152-(03)153 (17)153-(03)154 (16)156-(01)157 (16)157-(00)158 (14)158-(21)158 (15)159-(01)160 (18)164-(03)165 (15)165-(23)165 (17)166-(00)167 (16)168-(03)169 (18)169-(02)170 (15)170-(02)171 (15)171-(02)172 (15)172-(03)173 (16)173-(02)174 (16)174-(23)174 (20)191-(04)192 (14)204-(01)205 (14)205-(03)206 (13)206-(03)207 (17)207-(00)208 (20)210-(03)211 (19)211-(04)212 (16)212-(03)213 (12)213-(23)213 (19)214-(06)215 (13)215-(22)215 (16)216-(02)217 (15)217-(23)217 (15)272-(04)273 (14)277-(22)277