Relative Sea Level Trend

stationid city, state


mean trend plot
The relative sea level trend is #trendmmyr millimeters/year with a 95% confidence
interval of +/- #sterrmmy mm/yr based on monthly mean sea level data from
#startyear to #endyear which is equivalent to a change of feet in 100 years.

Plots show monthly mean sea levels without the regular seasonal fluctuations from coastal ocean temperatures, salinity, wind, atmospheric pressure, and ocean currents. The relative sea level trend is also shown with 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.

Plotted values are relative to the most recent Mean Sea Level datum established by CO-OPS. Calculated trends are available as a table in millimeters/year and in feet/century (0.3 meters = 1 foot). If present, solid vertical lines indicate dates of any major earthquakes in the vicinity of the station. Dashed vertical lines bracket any periods of questionable data or a possible datum shift.

Annual Mean Relative Sea Level Since 1960 and Regional Scenarios

stationid City, State

The projection of future sea levels that are shown below were released in 2022 by a U.S. interagency task force in preparation for the Fifth National Climate Assessment. The projections for 5 sea level change scenarios are expected to assist decision makers in responding to local relative sea level rise. The 2022 Sea Level Rise Technical Report provides further detailed information on the projections.

regional scenario plot
SAVE IMAGE

The figure shows the station's annual mean sea level since 1960 and five regionalized sea level rise scenarios plotted relative to a 1996-2014 baseline period, with the year 2005 as the 'zero' for the figure. The relative position of the Mean Sea Level datum established by CO-OPS is also shown. The relative position of the geodetic datum NAVD88, which is the 'zero' used for land elevations, is also provided if it has been determined for the station.

Interannual Variation

stationid City, State


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

stationid City, State


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

stationid City, State


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

stationid city, state


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
1612340
Honolulu, Hawaii
1617760
Hilo, Hawaii
2695540
Bermuda, Atlantic Ocean,
8410140
Eastport, Maine
8418150
Portland, Maine
8443970
Boston, Massachusetts
8447930
Woods Hole, Massachusetts
8452660
Newport, Rhode Island
8516945
Kings Point, New York
8518750
The Battery, New York
8531680
Sandy Hook, New Jersey
8534720
Atlantic City, New Jersey
8545240
Philadelphia, Pennsylvania
8557380
Lewes, Delaware
8574680
Baltimore, Maryland
8575512
Annapolis, Maryland
8594900
Washington, District of Columbia
8638610
Sewells Point, Virginia
8658120
Wilmington, North Carolina
8665530
Charleston, South Carolina
8670870
Fort Pulaski, Georgia
8720030
Fernandina Beach, Florida
8720218
Mayport, Florida
8724580
Key West, Florida
8727520
Cedar Key, Florida
8729840
Pensacola, Florida
8771450
Galveston Pier 21, Texas
9410170
San Diego, California
9410230
La Jolla, California
9410660
Los Angeles, California
9410840
Santa Monica, California
9414290
San Francisco, California
9419750
Crescent City, California
9439040
Astoria, Oregon
9443090
Neah Bay, Washington
9447130
Seattle, Washington
9449880
Friday Harbor, Washington
9450460
Ketchikan, Alaska
9451600
Sitka, Alaska
9452210
Juneau, Alaska

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