QUALITY ASSESSMENT OF SEA LEVEL DATA by the UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER JOINT ARCHIVE FOR SEA LEVEL updated 19 Jun 2018 Station : Manila Latitude: 14 34.9N Country : Philippines Longitude: 120 58.3E JASL # : 370A Time Meridian: 120E (GMT + 8 hr) GLOSS # : 073 Originator #: ML NODC #: 11124001 Contributor : National Mapping Resource Information Authority Coast and Geodetic Survey Department 421 Barraca St. San Nicolas 1010 Manila, Philippines and beginning 2006: UH Sea Level Center (UHSLC) University of Hawaii (UH) at Manoa Honolulu, Hawaii 96822 USA Originator : same Original Data: analog (OTT) and digital (others) Instrmnt Type: 1) 1984-03/2006 A.OTT, gravity type 2) 3/2006-2011: Aquatrak acoustic gauges ECS 3) 03/2006- radar (RAD) gauge (Vega Vegapuls 62) 4) 03/2006-2012 pressure transducer (PRS) Primary channel used in JASL set: 1984-03/2006: OTT 04/2006-2017: RAD *short gaps in primary channel filled with other channels as available; see UHSLC for specific dates #UH RAD tied to NMRIA reference level by adding 820 mm to UH series. Digitzd Intvl: 1 hr (OTT), 15 min ECS, 3 min RAD, 2 min PRS Present Data : Hourly, daily, and monthly values obtained by: Hourly : The original digitizing interval was hourly (OTT), 3-pt Hanning filter centered on the hour (others) 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 : 01 Jan 1984 - 05 Sep 2017 Gaps > 1 mon : 15 Jul 1990 - 04 Oct 1990;01 Apr 2001 - 29 Jun 2001 23 Oct 2002 - 01 Jan 2004;31 May 2004 - 10 Sep 2004 10 Sep 2007 - 11 Oct 2007;05 Jun 2008 - 06 Aug 2008 Time Refernce: GMT (hours 00-23) Space-filler Flag :-9999 Units : millimeters Missing Data Flag : 9999 Existing : Yes Operational : Yes Sat. Trans. : Yes Distribution : 1984-2014 Refernce Levl: All data are referred to the Datum of Observation, TSO 1901. The Reference Bench Mark is BM 4-B. It is in Intramuros Manila, at the plaza bearing the monument marking the 4th Centenary of the Mexico-Philippines Expedition. It is set on top of the oval-shaped electric post pedestal, positioned left of the Commission on Immigration building as viewed from the facade. Mark is a 5/8" diameter brass rod embedded on the structure protruding about 3.0 mm above the surface. The vertical distance between the Datum of Observation and the Reference Bench Mark is -5.306 m. The original data for 01 Jan 1984 - 31 Dec 1989 have been adjusted by adding 20 mm. This is based on a six month overlap with an updated series for the same site and assuming the update is correct. Based on differences of daily means with Legaspi and Cebu, the mean level for 2004 is suspiciously low. In response, this series received a temporary adjustment to the mean level of +150 mm for the complete year 2004. This feature is under investigation by the originators. UHSLC reference level (as noted above, UH series has been linked to NMRIA datum): 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 UHSLC for benchmark descriptions, maps, and the geodetic levelling history. Comment : Comparison with AVISO altimeter suggests long term slow upward trend, perhaps associated with sinking of the tide station foundation. This feature is under investigation. A timing offsets less than an hour are prevalent at times noted below by the questionable fluctuations. Significant meteorological events: period (dd/mm/yyyy) event ------------------- --------------- 30/08 - 04/09/1984 typhoon 23/10 - 30/10/1984 tropical storm 02/11 - 06/11/1984 typhoon 04/07 - 06/07/1985 tropical depression 05/10 - 08/10/1986 tropical storm 10/10 - 15/10/1986 typhoon 17/10 - 20/10/1986 tropical storm 06/11 - 14/11/1986 tropical storm Similar meteorological information for latter periods has not been provided. The station was moved in June 2015 from Latitude: 14 35.1N Longitude: 120 58.1E to 14 34' 55.76"N 120 58' 17.80"E. A level shift of +70 cm is suspected mid June 2015. These data are on hold until resolved. CI MISSING REPLACED GAPS QUESTIONABLE YEAR (%) DATA OR BAD DATA FLUCTUATIONS ---- --- -------------------- --------------- -------------------- 1984 100 none none 276-278,288-289,291- 292,315-316,323 1985 100 none none 5-6,8-10,18-20,33, 37,39-40,42-43,47- 48,53-54,102,123- 124,181-212,263,295- 296,344,348,365 1986 100 none none 11,56,119,190,248- 249,280-281 1987 100 none (09)154-(23)154 4-5,31,168,170,183- 185,219-221,243,270, 300-301,330 1988 97 270-279,288-291 none 298-299 1989 93 170-174,196-199, none none 207-210,247-258, 283-285,325-327 1990 77 178-180,196-277 none none 1991 100 none none none 1992 100 none (12)176-(05)177 none (10)288-(01)289 1993 98 234-236,351-354 none none 1994 100 none none 294 1995 97 237-240,265-269,287- (04)275-(02)276 307 289,301-303 (12)276-(03)277 (12)289-(02)290 (16)299-(03)300 (14)322-(06)323 (14)323-(03)324 1996 97 23-29,299-301, none none 335-338 1997 99 147-149 none none 1998 98 145-149,260-264 (18)049-(01)050 none (17)158-(01)159 (16)214-(02)215 (01)298-(00)299 1999 90 46-48,50-54,75-76, (16)042-(01)043 237-239,305-365 108-114,155-159,163- (16)063-(01)064 170,183-186,232-235, (07)120-(15)120 275-277,327-329,334- (03)139-(01)140 335,338-340 (04)151-(02)152 (03)163-(10)163 (10)331-(01)332 (16)332-(15)333 2000 99 202-205,278-279 none 1-174,183-184 2001 76 91-180 none none 2002 81 235-237,295-365 (02)084-(01)085 none (16)225-(01)226 (10)265-(01)266 (15)266-(05)267 2003 0 1-365 none none 2004 63 18-19,80-89,102-110, (19)275-(04)276 none 138-145,152-254, (13)316-(10)317 356-366 2005 97 156-158,177-178,226- (04)212-(00)213 none 229,255-258,280-283 (07)234-(01)235 (01)265-(00)266 (03)268-(01)269 (03)336-(15)336 (07)345-(01)346 2006 99 49-51 (15)026-(01)027 221,226,271 2007 99 308-309 (10)287-(23)287 none 2008 83 157-219 none none 2009 100 none (07)123-(23)123 none 2010 100 none none none 2011 100 none (11)181-(19)181 none 2012 95 154-155,168-170,180- (16)153-(04)154 none 184,213-216,227-230, (01)165-(13)165 268-269,272-274 (17)166-(11)167 2013 100 none (13)174-(23)174 none 2014 100 none (04)121-(23)121 none 2015 82 177-180,213-274 (09)167-(07)168 none (09)274-(03)275 (08)275-(23)275 (09)276-(23)276 (05)277-(23)277 (10)278-(00)279 (10)279-(00)280 (09)280-(05)281 2016 90 126-146,319-321,327- (13)018-(02)019 none 340,360-362 (13)019-(21)019 (16)034-(00)035 (13)035-(23)035 (11)037-(01)038 (12)038-(23)038 (14)039-(23)039 (09)040-(23)040 (16)121-(00)122 (16)299-(23)299 (13)302-(22)302 (13)303-(23)303 (15)304-(22)304 (13)305-(00)306 (12)306-(23)306 (09)307-(23)307 (10)308-(03)309 (07)309-(23)309 (10)310-(23)310 (10)311-(22)311 (10)312-(00)313 (09)313-(00)314 (14)314-(23)314 (13)315-(23)315 (10)316-(22)316 (11)317-(23)317 (12)318-(23)318 (10)321-(23)321 (10)322-(00)323 (10)323-(23)323 (09)324-(23)324 (12)325-(23)325 (11)326-(00)327 (08)356-(00)357 (09)357-(01)358 (09)358-(01)359 (10)359-(01)360 (08)362-(01)363 (05)363-(03)364 (08)364-(00)365 (08)365-(01)366 (06)366-(00)001 (07)001-(00)002 2017 64 6-13,19-24,59-61 (08)002-(22)002 none (09)003-(00)004 (07)004-(00)005 (09)005-(00)006 (13)042-(23)042 (12)043-(23)043 (09)044-(00)045 (14)045-(23)045 (13)046-(23)046 (12)047-(00)048 (09)048-(00)049 (09)049-(00)050 (11)050-(00)051 (13)051-(23)051 (13)052-(01)053 (08)053-(00)054 (09)054-(03)055 (06)055-(01)056 (06)056-(00)057 (07)057-(01)058 (11)058-(01)059