QUALITY ASSESSMENT OF SEA LEVEL DATA by the UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER JOINT ARCHIVE FOR SEA LEVEL updated: 03 Oct 2019 Station : Chichijima Latitude: 27 06.0N Country : Japan Longitude: 142 11.0E JASL # : 047A Time Meridian: 135E (GMT + 9 hr) GLOSS # : 103 Originator #: CC NODC #: 12147201 Contributor : Japan Meteorological Agency 1-3-4 Otemachi, Chiyoda-ku Tokyo, Japan Originator : Japan Meteorological Agency Original Data: analog Instrmnt Type: float/well: LFT-4; Fuess 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 : 31 Mar 1975 - 31 Dec 2018 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 : 1975-2018 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 4.146m above the DL. Comment : The daily or monthly means do not reveal any obvious reference level shifts. Most questionable fluctuations are related to natural events. Legal Notice Regarding JMA Data http://www.jma.go.jp/jma/en/copyright.html (website refers to where data were downloaded from for input into the JASL) Copyright Notice The material on this website is protected by the Copyright Law of Japan and related international laws. Apart from any fair dealing for the purposes of study, research and other personal use, as permitted under the Copyright Law, no part of the material on this website may be reproduced, re-used or redistributed without notice to the Japan Meteorological Agency. Any quotation from the material requires indication of the source. The Japan Meteorological Agency does not warrant, guarantee or make any representations regarding the currency, correctness, accuracy, reliability or any other aspect of the characteristics or use of the information presented on this website. The user assumes all risk related to the use of the information contained. Japan Meteorological Agency, 1-3-4 Otemachi, Chiyoda-ku, Tokyo 100-8122, Japan CI MISSING REPLACED GAPS QUESTIONABLE YEAR (%) DATA OR BAD DATA FLUCTUATIONS ---- --- -------------------- --------------- -------------------- 1975 75 none (14)198-(22)198 none 1976 99 180-181 none 181-182,297-298 1977 99 266-267 (20)096-(06)097 none (13)152-(23)152 (07)154-(14)154 1978 100 none (06)322-(12)322 none 1979 94 47-69 none none 1980 100 none none none 1981 100 none (12)198-(03)199 none (11)230-(22)230 (14)312-(21)312 1982 100 none (17)130-(14)131 none (19)204-(13)205 1983 100 none (14)027-(22)027 none (03)028-(10)028 (12)057-(22)057 (03)058-(10)058 1984 100 none (12)212-(18)212 303-304 (11)237-(18)237 (17)284-(23)284 1985 100 none (03)354-(15)354 none 1986 99 267-268 (09)267-(02)268 271 1987 99 257-259 (00)001-(19)001 none 1988 100 none (00)033-(23)033 none 1989 100 none (11)044-(22)044 none (11)131-(23)131 none (12)331-(23)331 1990 99 58-59,365 none none 1991 100 none none none 1992 100 none none none 1993 100 none none none 1994 100 none none none 1995 100 none none none 1996 100 none none none 1997 100 none none none 1998 100 none 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 100 none none none 2006 100 none none none 2007 100 none none none 2008 100 none none none 2009 100 none none none 2010 100 none none none 2011 100 none none none 2012 99 11-12 none none 2013 100 none none none 2014 100 none none none 2015 99 261-270 none none 2016 100 none (07)221-(03)222 none 2017 100 none none none 2018 99 365 none none