QUALITY ASSESSMENT OF SEA LEVEL DATA by the UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER JOINT ARCHIVE FOR SEA LEVEL updated: 12 Jul 2017 Station : Lerwick (Shetland Isles) Latitude: 60 09.3N Country : United Kingdom Longitude: 001 08.4W JASL # : 293A Time Meridian: 000E (GMT) GLOSS # : 236 Originator #: 236 NODC #: 76000101 Contributor : Tide Gauge Inspectorate (TGI), National Oceanography Centre Proudman Oceanographic Laboratory 6 Brownlow Street Liverpool L69 3GP United Kingdom Originator : Environment Agency Anglian Regional Office Kingfisher House Goldhay Way, Orton Goldhay Peterborough Cambridgeshire, PE2 5ZR Original Data: digital Instrmnt Type: 1) 1956: Temporary Munro gauge installed by the National Institute of Oceanography 2) 1963: Lea vertical gauge installed 3) 1965: Temporary Munro gauge removed 4) 1988: DATARING system installed 5) 1995: Lea gauge replaced by an Ott pneumatic gauge 6) 1995: Mid tide bubbler installed (30/11/95) Digitzd Intvl: 1959-1992: hourly, 1993-:15 minutes Present Data : Hourly, daily, and monthly values obtained by: Hourly : prior to 1993, undefined; 1993-2007: spot 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 : 15 Oct 1959 - 27 Nov 2016 Gaps > 1 mon : 05 Dec 1988 - 17 May 1989;19 Feb 2002 - 04 Aug 2003 31 Oct 2006 - 01 Aug 2007;15 Nov 2010 - 23 June 2011 31 Jan 2016 - 09 Mar 2016 Time Refernce: GMT (hours 00-23) Space-filler Flag :-9999 Units : millimeters Missing Data Flag : 9999 Existing : Yes Operational : Yes Sat. Trans. : Yes Distribution : 1959-2016 Refernce Levl: All heights refer to Admiralty Chart Datum (ACD). Ordnance Survey Grid Reference: HU 4783 4137 Tide gauge benchmark (TGBM), HU 4783 4129, OSBM bolt breakwater wall, 3.350m above ODL (Ordnance Datum Local) Aux1, HU 4784 4125, Queens Hotel, 7.5m SW face S angle, 4.008m above ODL Aux2, HU 4777 4110, Lerwick Parish Church, N face NW angle, 22.275m above ODL OD (Ordnance Datum is 1.22m above Chart Datum (CD) 1988-2001 Tide Gauge Zero (TGZ) = ACD TGZ = 1.22m below OD TGZ = 4.57m below TGBM TGZ = 5.228 below Aux1 TGZ = 23.495 below Aux2 TGZ = 2.71m below Ordnance Datum Newlyn Comment : The Tide Gauge building and measuring points are located on the inner wall at breakwater entrance to the small boat harbour, south of Victoria Pier. Questionable fluctuations for date ranges noted below appear to be timing offsets on the order of 15 minutes. National Tidal and Sea Level Facility Licence Agreement Condition of Use 1) Users must not pass on the data to third parties, but instead direct interested parties to the NTSLF Web site. 2) BODC, NERC and the Environmental Agency give no warranty as to the accuracy of the data or as to the suitability of the data for their intended use and shall not be responsible for any errors or omissions, or for the use of, or results obtained from this information. 3) Publications resulting from the use of the data shall include acknowledgement to BODC and the Environmental Agency (Suggested text "The data were supplied by the British Oceanographic Data Centre as part of the function of the National Tidal and Sea Level Facility, hosted by the Proudman Oceanographic Laboratory and funded by the Environmental Agency and the Natural Environmental Research Council".) 4) The recipient shall: a) Inform BODC of the outputs to which the data have contributed, e.g., references to scientific publications or reports, b) Offer to BODC, if requested and without charge, a copy of any value added data set or product derived from the data, c) Inform BODC of any inaccuracies or errors detected in the data. 5) BODC is entitled to terminate the licence at any time if the conditions of use are not observed and may revoke privileges in furutre if there is unauthorised redistribution of the data. 6) All intellectual property rights in the data and information supplied to you whether owned by NERC or third parties (e.g. the Environmental Agency) will continue to be owned by the respective parties. CI MISSING REPLACED GAPS QUESTIONABLE YEAR (%) DATA OR BAD DATA FLUCTUATIONS ---- --- -------------------- --------------- -------------------- 1959 100 none none none 1960 100 none none none 1961 100 none none none 1962 100 none none none 1963 100 none none none 1964 100 none none none 1965 100 none none none 1966 100 none none 75 1967 100 none none none 1968 99 289-291 (00)017-(23)017 none (00)364-(23)364 1969 90 1-13,68-69,182-203, none non 334-336 1970 100 none none 152-173 1971 100 none none none 1972 99 211-213 none none 1973 99 338-340 (00)363-(23)363 none 1974 95 69-75,78-84,106-107, (11)103-(10)104 none 141-147,324-325 (11)113-(08)114 (09)120-(08)121 1975 99 24-25,363-365 none none 1976 98 1-5,17-19 (10)075-(08)076 none 1977 93 155-157,220-241, (17)107-(08)108 none 253-254 (09)115-(08)116 (18)317-(09)318 (15)343-(09)344 (10)352-(09)353 1978 93 21-23,79-94,243-250, none none 346-348 1979 99 299-300 (19)144-(08)145 none (13)196-(08)197 (20)300-(09)301 1980 99 245-247 (00)112-(08)112 none (00)126-(08)126 (00)136-(08)136 (00)139-(08)139 (23)212-(06)213 1981 100 none none none 1982 99 45-46 none none 1983 100 none none none 1984 100 none none none 1985 100 none none none 1986 98 342-349 (12)322-(23)322 none 1987 100 none none none 1988 93 340-366 none none 1989 62 1-137 none none 1990 99 239-243 none none 1991 100 none none none 1992 100 none none 1 1993 100 none none none 1994 100 none none none 1995 99 333-334 none none 1996 97 65-76 none none 1997 100 none (00)322-(17)322 none 1998 100 none none 251-276 1999 100 none none none 2000 100 none (03)060-(16)060 64-233 2001 100 none none none 2002 14 50-365 none none 2003 41 1-216 (01)280-(13)280 none 2004 99 105-106 none none 2005 99 159-160 none none 2006 83 109-110,284-285, none none 304-365 2007 41 1-213,239-242 (11)353-(05)354 none 2008 100 none (13)282-(11)283 none (09)357-(18)357 2009 99 356-358 (06)346-(18)346 none 2010 86 265-266,310-315, none none 319-365 2011 53 1-174 none none 2012 99 117-121 none none 2013 100 none none none 2014 100 none none none 2015 99 363-365 none none 2016 69 1-5,31-69,76-78,93- (04)190-(13)190 none 110,192-211 (15)190-(22)190 (06)194-(16)194 (05)257-(23)257 (04)318-(11)318 (03)319-(11)319 (17)319-(00)320 (08)324-(15)324 (12)328-(19)328 (01)329-(08)329 (13)329-(21)329 (02)330-(09)330