Wednesday, January 24, 2018

On The More Robust Sea Level Computation Techniques - 7

Fig. 1
I recently decided to drop the "golden" from the method of selecting WOD zones (using a sample number of locations).

That "golden" description is an apt description, an efficient practice, and a worthwhile technique.

However, using hemisphere grouping may work better in this age of Oil-Qaeda induced climate-science mistrust (Humble Oil-Qaeda).

In place of golden locations, I have decided to use only three categories (Northern Hemisphere, Southern Hemisphere, and Both Hemispheres averaged together).

Fig. 2
Additionally, improvements have been made, problems have been solved, and the research has settled down in the satellite based technology we use for determinations of global sea level changes (Satellite snafu masked true sea-level rise for decades).

In response to those two eventualities I have conformed and synchronized the Dredd Blog software modules so that satellite and tide gauge station records can be graphed together in a hemispheric orientation.

Fig. 3a
Fig. 3b
Fig. 3c
The graph at Fig. 1 shows the hemispheric orientations without showing the satellite data pattern.

Fig. 4
The graph at Fig. 2 shows the hemispheric patterns along with the satellite data patterns

That satellite data begins in 1993, a time when the patterns merge together to form a tighter grouping.

The satellite record is entangled in the middle of the other three tracks.

To make it easier to detect, in the graphs at Fig. 3a - Fig. 3c, I isolated the hemisphere patterns to a single hemisphere (and both averaged) while including the satellite pattern.

The graph at Fig. 4 shows only the satellite pattern.

What we see is that the tide gauge station sea level change patterns in the two hemispheres are different, but they are closer in the satellite era from 1993 on to the present.

The isolated satellite record at Fig. 4 shows that global sea level rise is quite clear, and that the rate of rise is accelerating.

I hope that regular readers like this new arrangement as much as I do.

One aspect of this arrangement that is particularly worthwhile is that it is the same as the WOD graphing technique (e.g. The World According To Measurements - 10).

Now our ocean temperature, salinity, and volume change patterns are presented in the same geographical manner that hemispheric and global sea level change is presented.

One thing I have yet to finish is the anomaly change pattern (patterns without the RLR range of values).

The graphs today (including satellite data) are conformed to the Revised Local Reference (RLR) sea level millimeter standard (Definition).

The anomaly change pattern shows only the change in sea level from zero to the current level (0 to about 185 mm since circa 1880).

In closing, let me add that I recently updated the databases with year 2017 values where and when I could find them.

They will continue to trickle in over the months ahead (PSMSL is the slowest this year ... only 1 station reported 2017 records so far).

The next post in this series is here, the previous post in this series is here.

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