QUALITY ASSESSMENT OF SEA LEVEL DATA
by the
UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER
JOINT ARCHIVE FOR SEA LEVEL
updated: 02 Apr 2003
Station : French Frigate Shoals Latitude: 23 52.0N
Country : USA Longitude: 166 17.4W
JASL # : 014A Time Meridian: 165W (GMT - 11 hr)
GLOSS # : 107 TOGA #: P055 NODC #: 72163601
Contributor : UH Sea Level Center
1000 Pope Rd. MSB 317
Honolulu, Hawaii 96822
Originator : Dept. of Oceanography
University of Hawaii
1000 Pope Rd. MSB 317
Honolulu, Hawaii 96822
Original Data: digital
Instrmnt Type: 1) 7/1974-10/1996, Fischer and Porter
Analog-to-Digital Recorder (ADR)
2) 12/1987-present, Bristol Bubbler (BUB)
3) 10/1996-present, Handar Encoder 436A on
datalogger (ENO)
Primary gauge: ADR:7/1974-10/1996, ENO:10/1996-
Digitzd Intvl: 15 min
Present Data : Hourly, daily, and monthly values obtained by:
Hourly : (pre-1987) Nine-point triangular filter centered
on the hour with respective periods of the 95, 50,
and 5% amplitude point of the filter response at
623.6, 177.0, and 103.7 minutes;(1987+) three-point
Hanning filter centered on the 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 : 03 Jul 1974 - 31 Dec 2001
Gaps > 1 mon : 8 May - 1 Aug 1986; 1 Feb - 31 Mar 1987
Time Refernce: GMT (hours 00-23) Space-filler Flag :-9999
Units : millimeters Missing Data Flag : 9999
Existing : Yes Operational : Yes
Sat. Trans. : Yes Distribution : 1974-2001
Refernce Levl: All heights have been referred to the station tide
staff zero which is linked to fixed bench marks
Comment : The data from July 1974 to 16 August 1975 are
from a standard float/well gauge (analog). The
daily and monthly means reveal no obvious shifts
or trends.
CI MISSING REPLACED GAPS QUESTIONABLE
YEAR (%) DATA OR BAD DATA FLUCTUATIONS
---- --- -------------------- --------------- --------------------
1974 50 none none none
1975 98 227-228,254-259 none none
1976 95 34-36,59-61, none none
115-116,199-200,
316-322
1977 90 220-224,306-335 none none
1978 99 322-324 none none
1979 98 21-23,299-300 none none
332-333
1980 98 56-61,160-162 none none
1981 99 167-169,259-260 none none
1982 100 none none none
1983 93 78-88,335-345, none none
356-358
1984 99 110-112 none none
1985 100 none none none
1986 71 70-79,128-213, none none
317-321,352-356
1987 83 32-90,204-206 none none
1988 100 none none none
1989 100 none none none
1990 100 none none none
1991 100 none none none
1992 100 none none none
1993 100 none none none
1994 99 305-306 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 97 105-117,176-177 none none
2001 100 none none none