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The Search for Acceleration, part 8, Hawaii

August 16, 2013

magnifying glass 145This is part 8 of a series of posts in which I am searching for a large acceleration in sea level rise rate in the latter part of the 20th century.  Such a rise rate acceleration is needed  to reconcile the 1.8 mm per year average rise rate for the century attributed to tide gauge data and the approximately 3 mm per year rise rate for the tail end of the century attributed to the satellite data.

Hawaii

There are only four tide gauge stations in Hawaii with at least 90% of the data from 1960 to 2008.  One of them has good data back to 1910.  Evaluation of this small set of data sites is very simple and I will use the usual technique of detrending, weighting, averaging and derivatives, as shown in the following slide show.  (Note that you can pause or increment the slide show forward or backward by using the buttons that appear when your cursor is placed over the image.)

This slideshow requires JavaScript.

It is very hard to make an argument in support of a century end acceleration in sea level rise rate based on this Hawaiian data.

ENSO

SInce I removed the ENSO correlated component of the sea level for Western North America and for Australia, it stands to reason that the same thing should be done for Hawaii.  See here for the math.

The top graph in the following image shows the weighted, detrended, averaged Hawaiian  sea level (white), ENSO3.4 sea surface temperature (blue),  and the component of sea level data that is orthogonal to the ENSO3.4 data (red).  The bottom graph shows the corresponding relative rise rates associated with sea level (white) and with the ENSO orthogonal component of the sea level (red).  All data is through a 5 year FWHM Gaussian filter.

Rise rate orthongonal to ENSO
The correlation is small and, if anything, subtraction of the ENSO correlated component of the sea level makes a century end acceleration look even less plausible.

See an index of the Search for Acceleration series here.

_________________________________________

Sources

20th century rise rate average of 1.8 mm/year

1. Church and White Global Mean Sea Level Reconstruction

2. Links to Church and White sea level data

Satellite data (about 3 mm/year): CU Sea Level Research Group

RLR tide gauge data: Permanent Service For Mean Sea Level

ENSO/Global warming relationship: Cobb, et. al., Science, 339, 1/4/13

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