Rarotonga (Cook Islands) Site History

History Summary

Station Rarotonga
Country Cook Islands
Latitude 21° 12.4' S
Longitude 159° 46.5' W
GLOSS No 139
Time Reference GMT (hours 00-23)
Contributors UH Sea Level Center (1977-1993)
National Tidal Facility (NTF) 1993-
Flinders University of South Australia
GPO Box 2100,
Adelaide, 5001,
South Australia.
Instrument Type 1. (Apr 1977 - Dec 1984 )Fischer and Porter Analog-to-Digital Recorder (ADR)
2. (Dec 1984-present) Leupold and Stevens Analog-to-Digital Recorder (ADR);
3. (Dec 1984-1992) Handar Encoder (ENC)
4. 1993 - present SEAFRAME Gauge (Next Generation Water Level Measuring System (NGWLMS))
Primary gauge ADR: 1977-1990
ENC: 1991-1992
NGWLMS: 1993-present
Site of Gauge The gauge is situated about half way along the pier
Observational periods 1977 - 2001

Reference Level

All heights have been referred to the station tide staff zero which is linked to fixed benchmarks.

Quality Assessment by UH Sea Level Centre

Comment

The daily and monthly means reveal no apparent changes in the reference level.

The severe weather events of 22-26 February 1986 1 - 4 January 1987 and 9 December 1997 caused data loss and questionable fluctuations.

Year CI(%) Missing Data Replaced Gaps or Bad Data Questionable Fluctuations
1977 69 none none none
1978 98 28-30,56-60 none 55-56
1979 97 16-24,62-64 none none
1980 91 8-14,142-143,167-189 none none
1981 94 15-16,49-69 none none
1982 97 66-69,117-119,260-264 none none
1983 94 26-31,114-117,262-264,340-349 none none
1984 96 12-20,27-31 none 356-366
1985 100 none none none
1986 100 none none 57-58
1987 88 2-45 none none
1988 100 none none none
1989 100 none none none
1990 100 none none 45-47,334
1991 100 none none none
1992 100 none none none
1993 86 001(00)-079(00) none none
1994 99 364(00)-365(23) none none
1995 97 001(00),090(15)-093(00),181(18)-188(00) none none
1996 98 031(01)-032(21),034(04)-036(07),117(00)-118(12),297(20)-298(21) none none
1997 99 343(03)-344(03) none none
1998 94 296(19b)-316(23) none none
1999 100 none none 81-87,92-103,110-114
2000 100 none none none
2001 100 none none none