QUALITY ASSESSMENT OF SEA LEVEL DATA by the UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER JOINT ARCHIVE FOR SEA LEVEL updated: 22 Oct 2019 Station : Rarotonga-B Latitude: 21 12.0S Country : Cook Islands Longitude: 159 47.2W JASL # : 023B Time Meridian: 150W (GMT - 10 hr) GLOSS # : 139 Originator #: ID070001 NODC #: 52151901 Contributor : National Tidal Centre, Bureau of Meteorology PO Box 421 Kent Town SA 5071 South Australia AUSTRALIA Originator : same Original Data: digital Instrmnt Type: Aquatrak acoustic gauge (SEAFRAME) Digitzd Intvl: 6 min (average of 181 one minute samples) Present Data : Hourly, daily, and monthly values obtained by: Hourly : Cosine-Lanczos filter with cutoff of 120 min. 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 : 20 Feb 1993 - 31 Dec 2018 Gaps > 1 mon : 02 Jun 2010 - 27 Sep 2010;02 Aug 2012 - 20 Oct 2012 Time Refernce: GMT (hours 00-23) Space-filler Flag :-9999 Units : millimeters Missing Data Flag : 9999 Existing : Yes Operational : Yes Sat. Trans. : Yes Distribution : 1993-2018 Refernce Levl: All heights have been referred to the station Tide Gauge Zero (TGZ), which is linked to fixed bench marks. The height datum is Mean Sea Level derived from BM 18 in the 1993 survey. Height of Seaframe Sensor Bench Mark (SSBM) above TGZ is 3.3084m. Series 023A is separate from 023B because they are at different locations. Comment : At some time in the future, a single series from 023A and 023B will be created. At present, use of data for the years of overlap are at the discretion of the data users. The station is in the Town/District of Avatiu. The high resolution coordinates are Lat: 21 deg 11 min 58 sec S Lon: 159 deg 47 min 10 sec W The daily and monthly means reveal no apparent changes in the reference level. SPECIAL NOTE TO USERS OF NAT. TIDAL CENTRE DATA: As a user of this information, you are deemed to have read and accepted the conditions described in the Copyright Notice and Disclaimer at: http://www.bom.gov.au/other/copyright.shtml CI MISSING REPLACED GAPS QUESTIONABLE YEAR (%) DATA OR BAD DATA FLUCTUATIONS ---- --- -------------------- --------------- -------------------- 1993 86 none none none 1994 99 364-365 none none 1995 97 1,90-93,181-188 (21)103-(10)104 none 1996 98 31-32,34-36,117-118, none none 297-298 1997 100 none none none 1998 94 296-317 none none 1999 100 none none none 2000 100 none none none 2001 100 none none none 2002 100 none none none 2003 100 none none none 2004 100 none none none 2005 99 217-218 none none 2006 100 none none none 2007 100 none none none 2008 100 none none none 2009 100 none none none 2010 68 153-270 none none 2011 100 none none none 2012 78 215-294 none none 2013 100 none none none 2014 100 none none none 2015 100 none none none 2016 100 none none none 2017 100 none none none 2018 100 none none none