Saturday, November 28, 2015

New Type of SLC Detection Model - 11

Fig. 1
I am adding a feature that contrasts sea level change (SLC) volatility in relatively close areas.

The four examples today show Yakutat (Fig. 1) which is near Glacier Bay, Alaska, and San Francisco (Fig. 2), both on the west coast of the, and both covered in previous posts (Proof of Concept - 3).
Fig. 2

These four quickie graphs I did show the contrast of global mean sea level (GMSL) and global mean surface temperatures (GMST) with real local historical sea levels.

The use of GMSL and GMST, as these graphs show, does little to inform the public of the radical volatility of  sea level in local areas.

Fig. 3 Juneau, AK SLF
I mean that in the sense that a local area is real, it floods, and it becomes damaged by SLC (The King of King Tides Approaches).

The global mean average is a mathematical tool, but is not a proper way of informing the public because it covers up reality whether intended or not.

Anyway, when one asks the question "why is a town on the west coast experiencing
Fig. 4 Prince Rupert, BC SLR
serious sea level fall (SLF) while the other is experiencing serious sea level rise" (SLR)?

Journalists near one of those locations seem to have no clue as to why serious sea level volatility is taking place, reporting the issue as if it is the new normal, or as if the land has risen 4 ft. recently instead of taking thousands or millions of years (Alaska Dispatch News).

I guess the unknown is the new global mean normal, as cities even closer together than San Francisco and Yakutat (Juneau and Prince Rupert - 400 miles) tell the same tide gauge station story (see Fig. 3 and Fig. 4; cf. The Gravity of Sea Level Change).

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

Ballad of a Thin Man, by Bob Dylan (lyrics here):


  1. The "hinge point" is between the areas having SLF (Yakutat, Juneay) and those having SLR (Prince Rupert, San Francisco).

    It is explained in another Dredd Blog post (The Evolution and Migration of Sea Level Hinge Points).

  2. "Something strange is happening here, and it's happening much more quickly than we thought it should," Anand Gnanadesikan, associate professor in the Morton K. Blaustein Department of Earth and Planetary Sciences at Johns Hopkins ..." (link