QUALITY ASSESSMENT OF SEA LEVEL DATA by the UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER JOINT ARCHIVE FOR SEA LEVEL updated: 10 Oct 2019 Station : Nakano Shima Latitude: 29 50.5N Country : Japan Longitude: 129 50.5E JASL # : 345A Time Meridian: 135E (GMT + 9 hr) GLOSS # : none Originator #: HD28 NODC #: 12129901 Contributor : Japan Oceanographic Data Center 5-3-1 Tukiji, Chuo-ku Tokyo, Japan Originator : Japan Coast Guard Hydrographic and Oceanographic Department Tokyo, Japan Original Data: analog Instrmnt Type: LFT-5 (1984-1998); Acoustic (May 20,1998-) Digitzd Intvl: hourly Present Data : Hourly, daily, and monthly values obtained by: Hourly : hourly spot reading 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 Jan 1984 - 31 Dec 2018 Gaps > 1 mon : 09 Feb 2007 - 10 Mar 2007 Time Refernce: GMT (hours 00-23) Space-filler Flag :-9999 Units : millimeters Missing Data Flag : 9999 Existing : Yes Operational : Yes Sat. Trans. : no Distribution : 1984-2018 Refernce Levl: All data are referred to a Datum Line (DL) associated with the tide gauge. The Standard Mark (SM) is physically located near the tide gauge and is directly leveled to a First Order Bench Mark of the Geographical Survey Institute. The SM is 6.886m above the DL and 4.990m above the TP (mean sea level of Tokyo Bay, or Peil). For acoustic gauges without standard marks, the ground level at the gauge is indicated instead of the standard mark. Comment : The daily or monthly means do not reveal any obvious reference level shifts or trends This station is within the Global Climate Observing System (GCOS). CI MISSING REPLACED GAPS QUESTIONABLE YEAR (%) DATA OR BAD DATA FLUCTUATIONS ---- --- -------------------- --------------- -------------------- 1984 84 122-126,167-177,181- none none 181-190,278-281, 332-334 1985 100 none none none 1986 100 none none none 1987 100 none none none 1988 100 none none none 1989 100 none none none 1990 100 none (11)306-(02)307 none 1991 100 none none none 1992 100 none none none 1993 96 279-287,328-334 none none 1994 100 none none none 1995 100 none none none 1996 100 none none none 1997 100 none none none 1998 97 57-61,115-120,137- (13)125-(01)126 none 140 1999 91 69-87,266-279 (06)065-(03)066 none 2000 100 none none none 2001 100 none (13)240-(02)241 none 2002 100 none none none 2003 100 none none none 2004 99 242-245 none none 2005 100 none (12)192-(02)193 none 2006 100 none none none 2007 92 40-69 none none 2008 100 none none none 2009 100 none none none 2010 100 none (13)181-(03)182 none 2011 100 none (09)237-(01)238 none 2012 100 none none none 2013 100 none none none 2014 100 none none none 2015 100 none none none 2016 100 none none none 2017 99 171-173,216-219, none none 294-296 2018 99 233-236,365 (17)272-(04)273 none