Tofino (Canada) Site History

History Summary

Station Tofino
Country Canada
GLOSS No 156
Latitude 49° 09.0' N
Longitude 125° 55.0' W
Time Meridian 120° W (GMT -8 hr)
Contributor Marine Environmental Data Service,
Dept. of Fisheries and Oceans,
S12082-200 Kent St.
Ottawa, Ontario,
Canada K1A-0E6
Originator Canadian Hydrographic Service,
Institute of Ocean Sciences,
P.O. Box 6000,
Sidney, British Columbia,
Canada V8L-4B2
Instrument Type 2 separate float gauges (in separate wells) with bubbler pressure sensor backup
Historical data were from a standard float/well gauge
Original Data Historical data are analogue
Recent data are 1 minute averaged data, downloaded every hour
Observational Period November 1961 - January 2000,
January 2007 - January 2011

Tide Gauge Benchmark (TGBM) Description

All heights have been referred to the station tide staff zero which is linked to fixed benchmarks. The controlling benchmark is BM 7, 1971 which is 5.191m above chart datum and 3.096m above geodetic datum.

Quality Assessment

Comment

The data reveal no apparent reference level changes or trends. The hourly residuals show minor fluctuations within the tidal frequency band. It is estimated that the timing is off occasionally by about five to fifteen minutes. Only extreme fluctuations are listed below.

Year Completeness
Index (%)
Questionable Fluctuations (In day Nos.)
and Missing Data (Gaps >6 hours)
1965 100 none
1966 100 none
1967 100 none
1968 100 none
1969 100 none
1970 100 none
1971 100 none
1972 100 136-140
1973 100 none
1974 100 none
1975 100 none
1976 100 none
1977 99 Gap From 1977/03/30 at 1700 to 1977/04/01 at 0700
1978 75 Gap From 1978/10/01 at 0800 to 1978/12/31 at 2300
1979 99 Timing shifted by + 10 hours
Gap From 1979/06/17 at 2300 to 1979/06/21 at 0700
Gap From 1979/07/15 at 2300 to 1979/07/16 at 1400
1980 98 353-359 Gap From 1980/07/01 at 2200 to 1980/07/07 at 1700
1981 100 none
1982 100 none
1983 100 none
1984 58 Gap From 1984/04/11 at 0500 to 1984/09/12 at 1700
1985 100 none
1986 91 Gap From 1986/06/25 at 1700 to 1986/07/29 at 2000
1987 60 Gap From 1987/05/01 at 2100 to 1987/09/24 at 1400
1988 74 Gap From 1988/06/30 at 2200 to 1988/10/04 at 1800
1989 100 none
1990 100 none
1991 99 Gap From 1991/11/28 at 0300 to 1991/12/01 at 1800
1992 96 Gap From 1992/01/28 at 2100 to 1992/01/30 at 1700
Gap From 1992/06/07 at 1200 to 1992/06/10 at 0000
Gap From 1992/06/12 at 1800 to 1992/06/24 at 1700
1993 100 349
1994 100 none
1995 94 Timing shifted by + 7 hours
Gap From 1995/07/11 at 0000 to 1995/08/03 at 1000
Gap From 1995/08/16 at 1300 to 1995/08/28 at 1000
1996 100 none
1997 100 none
1998 100 none
1999 100 none
2007 100 none
2008 100 none
2009 100 none
2010 100 none