QUALITY ASSESSMENT OF SEA LEVEL DATA by the UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER JOINT ARCHIVE FOR SEA LEVEL updated: 17 Sep 2020 Station : Portland,ME Latitude: 43 39.4N Country : USA Longitude: 070 14.8W JASL # : 252A Time Meridian: 075W (GMT - 5 hr) GLOSS # : none Originator #:8418150 NODC #: 74073001 Contributor : National Ocean Service (NOS) National Ocean. and Atmos. Administration (NOAA) N/OES22 SSMC4, STATION 7109 1305 East West Highway Silver Spring, MD. 20910-3233 Originator : US Coastal Geodetic Survey (1901-1972);NOS (1973+) Original Data: analog (standard); digital (ADR and NGWLMS) Instrmnt Type: 1) standard mechanical, float/wire (1910-1967); 2) analog-to-digital (ADR) recorder, float/wire (1967-1994); 3) Aquatrak acoustic sensor/protective well, NOAA Next Generation Water Level Measuring System (NGWLMS) (1991-) Digitzd Intvl: hourly (standard); six-minute (adr and NGWLMS) NGWLMS sampling is three-minute average Present Data : Hourly, daily, and monthly values obtained by: Hourly : The original digitizing interval was hourly (standard); spot sampling on the hour (adr/NGWLMS) 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 : 04 Mar 1910 - 31 Dec 2019 Gaps > 1 mon : 01 Feb 1911 - 30 Mar 1911;01 Aug 1911 - 01 Jan 1912 09 Feb 1934 - 17 Mar 1934;24 Jan 1935 - 17 Mar 1935 29 Jan 1936 - 05 Mar 1936;01 Jan 1946 - 30 Apr 1946 01 May 1956 - 05 Jul 1956;02 Aug 1956 - 30 Sep 1956 01 Jul 1957 - 08 Aug 1957;01 May 1959 - 09 Jun 1959 01 Mar 1961 - 15 Jun 1961;01 Jul 1970 - 09 Oct 1970 18 Jun 1971 - 06 Aug 1971;04 Sep 1990 - 31 Oct 1990 01 Jan 1998 - 31 Jan 1998;01 Oct 1999 - 31 Oct 1999 Time Refernce: GMT (hours 00-23) Space-filler Flag :-9999 Units : millimeters Missing Data Flag : 9999 Existing : Yes Operational : Yes Sat. Trans. : Yes Distribution : 1910-2019 Refernce Levl: All heights have been referred to the station tide staff zero which is linked to fixed bench marks. While standard mechanical or ADR instrument was the primary gauge, leveling calibration factors were applied monthly based on tide staff comparisons. Comment : The daily and monthly means reveal no apparent reference level changes or trends and agree with the nearest stations. Timing accuracy was no better than about +/- 7 minutes prior to 1979. CI MISSING REPLACED GAPS QUESTIONABLE YEAR (%) DATA OR BAD DATA FLUCTUATIONS ---- --- -------------------- --------------- -------------------- 1910 83 none none 197-365 1911 43 32-89,213-365 (20)144-(07)145 1-31 1912 99 1 none 208-214,228,236-255 1913 100 none (00)099-(07)099 135-139 1914 100 none none none 1915 100 none none 150-152,290-326 1916 100 none (15)043-(23)043 324 1917 100 none none 269-296 1918 100 none none 49-50,208-209 1919 100 none none 249 1920 100 none none none 1921 100 none none 19-28 1922 100 none none 9-14 1923 86 274-324 none 5,344 1924 100 none none none 1925 100 none (11)058-(21)058 none (00)240-(11)240 1926 100 none none none 1927 100 none (00)125-(11)125 14 1928 100 none none 57-59,137-147,273- 275,305-333 1929 100 none none none 1930 100 none none 362-363 1931 100 none none 32,42,116,174 1932 100 none none none 1933 100 none none none 1934 87 1-11,40-76,81-84 (00)096-(08)096 350 1935 84 15-22,24-76 (21)082-(05)083 none 1936 86 29-65,291-305 (10)021-(08)022 none (21)026-(08)027 (14)072-(07)073 1937 100 none none none 1938 100 none none none 1939 100 none none none 1940 100 none none none 1941 100 none none none 1942 100 none none none 1943 100 none none 59,265 1944 100 none none 259 1945 100 none none none 1946 67 1-120 none 121-123 1947 99 201-202,208-209 (19)184-(03)185 60-70 (20)185-(09)186 (09)187-(06)188 (18)199-(03)200 (21)202-(06)203 (22)203-(07)204 (11)204-(08)205 (00)206-(12)206 (01)207-(09)207 (14)207-(22)207 (15)209-(23)209 1948 100 none none 55 1949 95 182-199 none 96 1950 100 none none 178-180,255,317-318 1951 100 none none 25-31,217-219,249, 336-339 1952 100 none none 82-85,185-197,218- 219,223-225,249-251 1953 100 none none 61-67,102-103,236 1954 100 none none 49-53,122-127,184, 243,254,260-264,299, 314-315,317,333-334, 346-348 1955 100 none none 43-44,173-174,331- 332,343-344 1956 66 122-187,193-195, (04)205-(13)205 296-297 215-274 1957 90 182-220 none none 1958 100 none none 8,49-53 1959 89 121-160 (21)179-(12)180 42-43,270 1960 100 none none 256 1961 71 60-166 none 1962 100 none (10)152-(23)152 194-205,295-296 (09)216-(01)217 1963 100 none none none 1964 100 none none none 1965 100 none none 186,206,214 1966 100 none none none 1967 100 none none none 1968 100 none none none 1969 100 none none none 1970 73 182-282 none none 1971 86 159-160,163-165, (05)152-(03)153 none 169-218 (02)155-(12)155 (05)167-(15)167 (04)168-(14)168 1972 95 174-180,187-197, none 210,253-255 205-206 1973 100 none none 106-184,217-218,233 1974 100 none none 45-115,125,143-147, 179-181,253,275-278 1975 100 none none 123,266-267,279-283 1976 97 329-339 none none 1977 98 60-68 (19)077-(14)078 208-215,238-244 (08)123-(05)124 1978 100 none none 227-230 1979 98 49-57 none none 1980 100 none none none 1981 100 none none none 1982 100 none none none 1983 100 none none none 1984 100 none none none 1985 100 none none none 1986 100 none (01)012-(10)012 19 (08)021-(16)021 1987 100 none none none 1988 100 none none none 1989 100 none (01)142-(23)142 103-105 1990 84 247-304 none none 1991 100 none none 231 1992 100 none none none 1993 100 none (08)365-(23)365 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 90 2-3,14-17,30-32, (08)006-(17)006 none 274-304 (23)336-(08)337 (22)360-(15)361 2000 100 none (05)022-(18)022 none (04)034-(12)034 (16)034-(06)035 (15)216-(14)217 2001 99 182-183 (21)181-(09)182 none 2002 100 none (15)304-(23)304 none 2003 95 24-30,29-40,43-47, (00)031-(09)031 none 62-64,66-67,69-71, (12)031-(23)031 73-74 (08)037-(18)037 (21)037-(06)038 (04)049-(15)049 (14)056-(12)057 (23)059-(14)060 (03)064-(16)064 (16)074-(12)075 (11)086-(20)086 (22)086-(07)087 (04)308-(12)308 (17)327-(01)328 2004 100 none none none 2005 100 none none none 2006 100 none none none 2007 97 196-207 none none 2008 99 3-4 (14)226-(04)227 none 2009 100 none none none 2010 100 none none none 2011 100 none none 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 100 none none none 2018 100 none none none 2019 100 none none none