1840000 Chuuk, Pacific Ocean

The mean sea level (MSL) trend at Chuuk, Pacific Ocean is +0.60 mm/year with a 95% confidence interval of ±2.01 mm/year, based on monthly mean sea level data from 1947/10 to 1995/6. That is equivalent to a change of 0.20 feet in 100 years. (R‑squared = 0.009)

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.

Options

Show calculated linear trend (linear regression)
Show linear trend 95% confidence intervals
Show linear trend 95% prediction intervals
Show quadratic regression
Show quadratic trend 95% confidence intervals†
Show quadratic trend 95% prediction intervals†
Show NOAA's linear trend
Show NOAA's linear trend 95% confidence intervals
Show CO2 levels
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Graph from:	start date	thru end date
Calculate using:	start date	thru end date
Show MSL from:	start date	thru end date

Data source: NOAA PSMSL NOAA,PSMSL PSMSL,NOAA

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

Data source: 463 months from NOAA + 32 months from PSMSL.

Click 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 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 = -25.449 + 0.597·x mm

Quadratic:
y = B' + M·x + A·x²
y = -22.426 + 0.597·x + -0.0192·x² mm

where:
Date range = 1947/10 to 1995/6
x = (date - 1972.12) (i.e., 1972/2)
slope = M = 0.597 ±2.011 mm/yr
acceleration = 2·A = 2×-0.0192 = -0.0383 ±0.3403 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