|Fig. 1 Climate Change and Sea Level|
Regular readers know that I have been putting a lot of research and writing into the subject of sea level rise (SLR) this year.
That is not to imply that I haven't written anything at all about SLR in years past (e.g. Will This Float Your Boat?, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11; 5/11-5/15).
What I have not focused on in sea level fall (SLF).
While researching the issue, while developing software to calculate future SLR, and while urging more attention to SLR, I just had an epiphany today.
I seems science fiction, but the epiphany is this: unless we have had an SLF, we cannot yet have had an SLR.
That is, unless the science team that I wrote about on Friday has an invalid hypothesis (Is A New Age Of Pressure Upon Us? - 7).
II. The Issue of Gravity Loss @ Greenland & Antarctica
Take a careful look at Fig. 1 and Fig. 2, as well as the posts they link to, because they show that both SLF and SLR are one of the results of melting ice sheets.
|Fig. 2 Axis Upheaval|
That is, Fig. 1 and Fig. 2 show a fall in sea level around both Greenland and Antarctica as a result of the loss of gravity caused by the loss of ice mass on those two ice sheets.
And of all things, like I wrote about in Friday's post, quoting the science team that works on this physics oriented aspect of SLR / SLF, when the ice sheet of West Antarctica (WAIS) melts, the resulting SLR of 4 ft. will manifest at, of all places, the coasts of the United States!
Not only that, the same thing happens to the U.S. when the ice sheet at Greenland melts (Greenland & Antarctica Invade The United States, 2, 3).
III. The Gravamen of the Situation
We must with all dispatch determine if the science in the hypothesis of Professor Jerry X. Mitrovica et al. is correct (see video below).
We must determine if the SLF around Greenland and Antarctica can be detected, and if not, why not.
There is SLF around Alaska where glaciers along with their gravity have vanished into history (Southern Alaskan Sea Level Fall).
The ice shelf floating on the ocean around Antarctica may be a deterrent to detecting SLF, but there are open water areas around Greenland where that is not the case.
Check it out dear scientists.
IV. The Potential Consequence of Not Knowing
There would be no loss of gravity if all the meltwater was going into the huge canyons and river systems beneath both Greenland and Antarctica (The Surge: A Forgotten Aspect of Sea Level Rise).
Which means that at any time whatever is damming the meltwater, whatever is preventing it from reaching the sea, is keeping the gravity there over the land too.
A surge (or "pulse") in this case is a sudden release of meltwater when an obstruction gives way letting all the gravity and water flow into the sea away from the land:
However, meltwater pulse 1C (8,200-7,600 years ago) left traces at numerous locations in the United States, northwestern Europe, and China. It occurred soon after the 8200 year cold event, which resulted from the final catastrophic drainage of glacial Lakes Agassiz and Ojibway around 8400 years ago. The torrent of around 100,000 cubic kilometers unleashed within a few years or less amounted to barely a meter rise in global sea level, if evenly spread across the world's oceans (note 1). Yet the stratigraphic record preserves vestiges of this relatively minor pulse.(The Surge: A Forgotten Aspect of Sea Level Rise, cf. Weekend Rebel Science Excursion - 45). SLF is the hidden gorilla in the SLR room.
Somebody has to do it.
In the next few days or so I am upgrading my SLR calculation software to also deal, in some way, with the concept of gravity induced SLF (unless comments by regular readers have contra information).
Professor Jerry X. Mitrovica on the gravity / axis bulge SLR issues we don't hear about often enough:
05:00 ... an ice sheet has mass ... it has an effect on the sea water around it ...
18:15 ... if glaciers melt in Alaska sea around it will drop ...
19:15 ... unevenness of SLF / SLF informs what ice is melting where ...