Relative Sea Level Trend

680-140 Sydney, Fort Denison 1 & 2, Australia


mean trend plot
The relative sea level trend is 0.8 millimeters/year with a 95% confidence
interval of +/- 0.1 mm/yr based on monthly mean sea level data from
1886 to 2022 which is equivalent to a change of 0.26 feet in 100 years.

Data for 1886- May 1914 are based on monthly mean tide levels plus a 1.7 mm correction

Source Data & Additional Metadata
GLOSS Station Information

The plot shows the monthly mean sea level without the regular seasonal fluctuations due to coastal ocean temperatures,salinities, winds, atmospheric pressures, and ocean currents. The long-term linear trend is also shown, including its 95% confidence interval. Relative Sea Level trends at the coast can be positive or negative. A negative trend does not mean the ocean surface is falling; It indicates the land is rising more quickly than the ocean in a particular area. Trends close to zero indicate the land is rising at nearly the same rate as the ocean.

The plotted values are relative to the Revised Local Reference (RLR) datum as established by the Permanent Service for Mean Sea Level (PSMSL). The calculated trends for all stations are available as a table in millimeters/year and in feet/century (0.3 meters = 1 foot).If present, solid vertical lines indicate times of any major earthquakes in the vicinity of the station and dashed vertical lines bracket any periods of questionable data or datum shift.

Interannual Variation

680-140 Sydney, Fort Denison 1 & 2, Australia


interannual variation plot

The plot shows the interannual variation of monthly mean sea level and the 5-month running average. The average seasonal cycle and linear sea level trend have been removed. Interannual variation is caused by irregular fluctuations in coastal ocean temperatures, salinities, winds, atmospheric pressures, and ocean currents. The interannual variation for many Pacific stations is closely related to the El Niño Southern Oscillation (ENSO). If present, solid vertical lines indicate times of any major earthquakes in the vicinity of the station and dashed vertical lines bracket any periods of questionable data or datum shifts.

Interannual Variation Since 1990

680-140 Sydney, Fort Denison 1 & 2, Australia


interannual variation plot

The plot shows the interannual variation of monthly mean sea level and the 5-month running average. The average seasonal cycle and linear sea level trend have been removed. Interannual variation is caused by irregular fluctuations in coastal ocean temperatures, salinities, winds, atmospheric pressures, and ocean currents. The interannual variation for many Pacific stations is closely related to the El Niño Southern Oscillation (ENSO). If present, solid vertical lines indicate times of any major earthquakes in the vicinity of the station and dashed vertical lines bracket any periods of questionable data or datum shifts.

Average Seasonal Cycle

680-140 Sydney, Fort Denison 1 & 2, Australia


seasonal cycle plot

The average seasonal cycle of mean sea level, caused by regular fluctuations in coastal temperatures, salinities, winds, atmospheric pressures, and ocean currents, is shown along with each month's 95% confidence interval. For local and regional comparisons, the calculated average seasonal values for all non CO-OPS and CO-OPS Stations are available as tables in meters.

Variation of 50-Year Relative Sea Level Trends

680-140 Sydney, Fort Denison 1 & 2, Australia


50 year trend plot

Linear relative sea level trends were calculated in overlapping 50-year increments for stations with sufficient historical data. The variation of each 50-year trend, with 95% confidence interval, is plotted against the mid-year of each 50-year period. The solid horizontal line represents the linear relative sea level trend using the entire period of record.

Variation of 50-Year Relative Sea Level Trends
040-221
Bergen, Norway
040-321
Oslo, Norway
050-141
Stockholm, Sweden
060-351
Helsinki, Finland
084-161
Klaipeda, Lithuania
110-092
Swinoujscie, Poland
120-012
Warnemunde, Germany
120-022
Wismar, Germany
125-001
Travemunde, Germany
130-121
Esbjerg, Denmark
140-012
Cuxhaven 2, Germany
150-001
Delfzijl, Netherlands
150-021
Harlingen, Netherlands
150-031
Den Helder, Netherlands
150-051
Hoek van Holland, Netherlands
150-061
Maassluis, Netherlands
160-021
Oostende, Belgium
170-011
Aberdeen I, UK
170-053
North Shields, UK
170-161
Newlyn, UK
190-091
Brest, France
230-051
Marseille, France
270-061
Trieste, Italy
300-001
Tuapse, Russia
305-021
Poti, Georgia
500-041
Mumbai/Bombay, India
642-091
Aburatsubo, Japan
647-023
Hamada, Japan
680-140
Sydney, Fort Denison 1 & 2, Australia
680-471
Fremantle, Australia
822-071
Vancouver, Canada
822-101
Victoria, Canada
840-011
Balboa, Panama
970-001
Saint John, N.B., Canada
970-011
Halifax, Canada

Products available at 680-140 Sydney, Fort Denison 1 & 2, Australia

There are no additional products available for the non-CO-OPS global station: 680-140 , .