1612340 Honolulu, HI, USA


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The mean sea level (MSL) trend at Honolulu, HI, USA is (?) mm/year with a 95% confidence interval of ±(?) mm/year, based on monthly mean sea level data from (????) to (????). That is equivalent to a change of (?) feet in 100 years. (R‑squared = (?))

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, in red, along with its 95% confidence interval. The plotted values are relative to the most recent Mean Sea Level datum established by NOAA CO-OPS.

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To change the graph width, resize your browser window and then click: 

   Data source: ? months from NOAA + ? months from PSMSL.

Click thumbnail here for a down­load­able, book­mark­able image (except in Internet Explorer or Microsoft Edge, use PrtScn, or see NOAA's version, or PSMSL's version.)

For thumbnail a simple explan­a­tion of the mean­ing of the 95% con­fi­dence & pre­dic­tion inter­val traces shown in the graph, see this two-minute instruc­tional video, by Dr. Gerard Verschuuren.

Linear:
  y = B + M·x
  y = B + M·x mm
 
Quadratic:
  y = B' + M·x + A·x²
  y = B + M·x + A·x² mm
 
where:
  Date range = (1935) to (2015)
  x = (date - avg(date)(date)
  slope = M = ± mm/yr
  acceleration = 2·A = 2×A = ± mm/yr²

To see precise values, hover your mouse cursor over the graph traces (or touch the graph on a touch-screen).

To download the seasonally-adjusted monthly MSL data from NOAA, in CSV format, click here.

We also have a graph of just carbon dioxide (CO2) levels, and a combined graph of CO2 and CH4.

Preliminary

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