No acceleration in sea level rise

There has been no acceleration in sea level rise for at least 100 years, probably longer.

NOAA Data (Again) Shows No Acceleration In Sea Level Rise. “CO2 › Our Climate In PicturesSea Levels

21 Sep 2012 – Moreover, the sea levels, which have been rising for 10 thousand years, show no acceleration whatsoever globally, in stark contrast to the

Misleading claims about sea level rise – globalwarmingquestions

J. Church and N. J. White, A 20th century acceleration in global sea level rise “Thus there is no evidence for an apparent acceleration in the past 100+ years”.

The Current Wisdom: No Climate-Related Acceleration in Sea Level…/current-wisdom-no-climaterelated-accelera
Walter Olson
by Walter Olson – in 971 Google+ circles – More by Walter Olson

30 May 2012 – The Current Wisdom is a series of monthly articles in which Senior Fellow Patrick J. Michaels reviews interesting items on global warming in the

There appears to be some confusion among climate catastrophists as to the meaning of acceleration and this may help:



Definition: Acceleration is the rate of change of velocity as a function of time. It is vector. In calculus terms, acceleration is the second derivative of position with respect to time or, alternately, the first derivative of the velocity with respect to time.
The SI units for acceleration are m / s2 (meters per second squared or meters per second per second).
Globally, (SLR) sea level rise is a slow moving phenomenon that’s been happening since the last ice age ended.
SLR accelerated during the Medieval Warm Period, slowed down during the Little Ice Age and is now getting back up to speed in this interglacial, but hasn’t accelerated unusually for over 100 years.
Anyone who’d like to read a calming article on this subject, try this:
Worried About Floods Due to Rising Sea Level? Forget It: Not Happening


Science 1 November 2013:
Vol. 342 no. 6158 pp. 617-621
DOI: 10.1126/science.1240837


Observed increases in ocean heat content (OHC) and temperature are robust indicators of global warming during the past several decades. We used high-resolution proxy records from sediment cores to extend these observations
in the Pacific 10,000 years beyond the instrumental record. We show that water masses linked to North Pacific and Antarctic intermediate waters were warmer by 2.1 ± 0.4°C and 1.5 ± 0.4°C, respectively, during the middle Holocene Thermal Maximum than over the past century. Both water masses were ~0.9°C warmer during the Medieval Warm period than during the Little Ice Age and ~0.65° warmer than in recent decades……

The Arctic should be a very sensitive to GHG caused warming, according to the models. As all agree, GHG concentrations were much lower during the MWP. Here are some additional papers that find that the MWP was a warm or warmer than currently.

Grudd (2008), Justwan et al. (2008), Scire et al. (2008), Axford et al. (2009), Bjune et al. (2009), Cook et al. (2009), Fortin and Gajewski (2010), Büntgen et al. (2011), Divine et al. (2011), Ran et al. (2011), Velle et al. (2011), D’Andrea et al. (2012) and Esper et al. (2012),


Jan 2015

Sea level has risen 120 metres over the last 20,000 years, that’s an average of 6 mm/yr.

During the 20th century, sea level rise averaged 1.8 mm/yr.
Current sea level rise is 2.8 mm/yr., less 0.8 mm/yr* due to groundwater extraction, amounting to a rise of 2 mm/yr., which is 0.1 mm/yr above the 20th century average,  way short of the 20,000 year average and just a tad short of the 11.3 mm/yr required to fulfil the prediction of a 1 metre rise by 2100.

* Groundwater extraction accounts for 0.8mm yr of SLR.

Groundwater depletion most acute in India, Pakistan, the US and China
Rising sea levels attributed to global groundwater extraction

Feb 2015

Thermal expansion of oceans can only happen until maximum temperature is reached.


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