70 Metre Rise In Sea Level?

[CapelDodger]

Is Lake Woebegone above average, altitude-wise?

Yes and no. (Pick the average out of that, smartarse .)

 

[macdoc]

"Quickly" is a relative term and in terms of geologic it could be an eyeblink as the conditions are set ofr cascading collapse with the sea intruding under the glaciers.

Even if that happens regionally massive ice shelves then drift off to melt .....as they have been doing for the past 10 years.

 

[CORed]

Move to Toronto and you will be saved! Lake Ontario is 75m above sea level.

I think you mean Ontario Bay.

 

[CapelDodger]

I think you mean Ontario Bay.

Since there'll be a whole new set of maps needed anyway, the locals could be a bit more adventurous than that.

Not terribly likely, eh?

 

[mhaze]

"Quickly" is a relative term and in terms of geologic it could be an eyeblink as the conditions are set ofr cascading collapse with the sea intruding under the glaciers.

Even if that happens regionally massive ice shelves then drift off to melt .....as they have been doing for the past 10 years.

Oh, okay. "Very quickly" means very slowly.

Got it! Thanks!

 

[CapelDodger]

Is Lake Woebegone above average, altitude-wise?

I still can't remember where it is .... Somewhere with lots of Swedes, as I vaguely recall, so it's near Canada presumably. "Looks like home; let's stop here." Damn, I've got a whole book on it around here somewhere ...

Sounded nice . Hope it makes it. I'd be stringing the razor-wire right now, and getting the old shield-wall drill going. "Trust in your shield and overlap your fields-of-fire", as the legendary Olaf My-Turf used to say.

 

[CapelDodger]

One of my colleagues brought my attention to the "below sea level" terrain in Antarctica and how ocean water could penetrate beneath and hasten dissolution of the western glacial masses.

That was news for me but I did not have a sense of how much ...now I do

Wow got a visual of Antarctic currently above sealevel...- floating away ice indeed
http://www.physorg.com/newman/gfx/news/RonneFichner.jpg
http://www.physorg.com/news153066381.html

That's almost half the continent is below current sea level.......that could get nasty rather quickly...

for reference Antarctica - (13,209,000 sq km) is 50% larger than the continental US.....no small chunk of land area.

On the human scale it's a long time before all of that goes, by which time we'll be over, gone, history or we'll probably be able to stabilise matters. Don't forget that in a century we are going to so all over climate and ice-dynamics that the whole frickin' system will be our bitch. Happy are the young and yet-to-be glaciologists of today for they shall see wonders and observe them directly! Who saw that coming?

Time was that the primary requisite of a glaciologist was patience. Not any more. It's an exciting field, and not just for Canadians.

On the more human term it's the ocean-floor profile off West Antarctica that could spring some surprises. Where it slopes down (going towards the interior) under the ice-contact layer any intruding ocean is going to push in under pressure. Where it rises the process will slow dramatically. It seems to me, anyway, from a simple mental model.

That could still leave a lot of previously grounded ice floating, which brings me to the thrust of the article : gravitational forces will draw it inexorably away from the pole. This is the reverse action of the water that is currently drawn there by an anchored mass. Which floating ice isn't so much. It won't be entirely free; it will still be held by tensile forces to grounded ice.

The tensile strength of ice is not great, nor is it very elastic. When it fails it fractures. Ergo the process will be sporadic, not continuous. Oops.

 

[CapelDodger]

From Quaternary Science Reviews via ScienceDaily

Dramatic Rise In Sea Level And Its Broad Ramifications Uncovered
http://www.sciencedaily.com/releases/2009/02/090209205314.htm

Scientists have found proof in Bermuda that the planet’s sea level was once more than 21 meters (70 feet) higher about 400,000 years ago than it is now.


Storrs Olson, research zoologist at the Smithsonian’s National Museum of Natural History, and geologist Paul Hearty of the Bald Head Island Conservancy discovered sedimentary and fossil evidence in the walls of a limestone quarry in Bermuda that documents a rise in sea level during an interglacial period of the Middle Pleistocene in excess of 21 meters above its current level.

Determining the timing and extent of this global rise in sea level is not only important for interpreting the influence that it may have had on biogeographical patterns and extinctions of organisms on islands and low-lying continental coastal areas, it is also critical for anticipating the possible effects of future climate change. This particular interglacial period is considered by some scientists to be a suitable comparison to our current interglacial period. With future carbon dioxide levels possibly rising higher than any time in the past million years, it is important to consider the potential effects on polar ice sheets.

Biogeographers, conservationists and many others in the biological sciences must take these findings into consideration, Olson urged. “These findings are incredibly important and have major relevance because of their potential predictive value since this sea-level rise took place during the interglacial period most similar to the present one now in progress. It thus becomes essential that the full extent and duration of this event be more widely recognized and acknowledged.”

(My emphasis)

I expect this to get some play. This happened without human intervention (barely a token presence, even).

Discuss .

 

[Old Bob]

A lot of posts talk of ancient sea levels being higher (No man made warming then) As I said earlier the globe changes shape over time altering the dia. at the equator and that alters sea levels. Perhaps it's not the total sea level reason change and yes more melt more water. Another question, many of the deep sea trenches are far more dramatic than the dry land trenches even the rift valley is no where as deep as some under sea trenches. What I'm trying to say does the weight of the water push the sea bed down and modify the sea level rises.

 

[Akhenaten]

A lot of posts talk of ancient sea levels being higher (No man made warming then)

Dinosaur farts.

As I said earlier the globe changes shape over time altering the dia. at the equator and that alters sea levels.

The fact that you said something earlier can only serve to cast doubt on its veracity. Perhaps a reference or two would help that.

Perhaps it's not the total sea level reason change and yes more melt more water.

Perhaps you should post in English.

Another question,

Perhaps you should ask the first question first.

many of the deep sea trenches are far more dramatic than the dry land trenches even the rift valley is no where as deep as some under sea trenches. What I'm trying to say does the weight of the water push the sea bed down and modify the sea level rises.

No. In ancient times, icebergs didn't float because the Earth was a dodecahedron and the undersea trenches were carved out by massive underwater glaciers.

 

[mhaze]

Dinosaur farts......icebergs didn't float because the Earth was a dodecahedron and the undersea trenches were carved out by massive underwater glaciers.

Now, now. A bit tired and cranky? Brain played out, leading to Argument from Ridicule? You can go to bed now. Would you like some warm milk?

Recapping this thread, it starts with a totally lame and unsupported wild assertion of a 70 meter sea level rise. But Warmers are basically worriers, and the wilder the assertion, the more they go off on it. This thread is a good example. Go back and see if anyone questioned the starting premise: 1 meter in 20 years.

Much later Capel comes in with an attempt to salvage some small bit of "But it's Alarmingly Worse" with an article about non uniform gravitational influences, from a totally different direction.

No, it isn't Alarmingly Worse, and no, big chunks of civilization are not going underwater, and no, Bangladesh isn't going to flood, it is gaining land.

 

[six7s]

Bangladesh isn't going to flood, it is gaining land.

Really? Please, do explain how you know (or why you believe) this

 

[mhaze]

Really? Please, do explain how you know (or why you believe) this

It is a quantitative reality.

 

[dann]

As to adaptation, tell that to the Dutch . A few metres and they're gone, and it's much the same for Denmark.

What do you mean? We seem to be doing fine! Copenhagen has lost its airport and the island of Amager, and we appear to have lost the connection with the continent and turned into an archipelago, but it isn't something a couple of new bridges couldn't mend. And my weekend cottage has moved a little closer to the beach.

 

[six7s]

It is a quantitative reality.

Yeah? So, does this particular brand of 'quantitative reality'make these kids property barons?

​

 

[Pipirr]

What do you mean? We seem to be doing fine! Copenhagen has lost its airport and the island of Amager, and we appear to have lost the connection with the continent and turned into an archipelago, but it isn't something a couple of new bridges couldn't mend. And my weekend cottage has moved a little closer to the beach.

And of course the Carlsberg brewery is on top of a hill... in Frederiksberg. That's all you need, right there

 

[mhaze]

Yeah? So, does this particular brand of 'quantitative reality'make these kids property barons?

​

Do you have a scheme to create a static and unchanging landmass? Since 1800 over 1M in Bangladesh have died from drowning. Bangladesh gaining land is good.

 

[CapelDodger]

Much later Capel comes in with an attempt to salvage some small bit of "But it's Alarmingly Worse" with an article about non uniform gravitational influences, from a totally different direction.

You're gibbering again. Alert your programmers.

There's only one important direction from Antarctica and that's North.

No, it isn't Alarmingly Worse, and no, big chunks of civilization are not going underwater, and no, Bangladesh isn't going to flood, it is gaining land.

I have a source for beach-front Bangladeshi property at a price that's an absolute steal (mostly because it's yet to emerge, but in a few years you can cash in big-time).

 

[CapelDodger]

What do you mean? We seem to be doing fine! Copenhagen has lost its airport and the island of Amager, and we appear to have lost the connection with the continent and turned into an archipelago, but it isn't something a couple of new bridges couldn't mend. And my weekend cottage has moved a little closer to the beach.

I'm glad to hear you guys are staying put. On this side of the North Sea we have unhappy memories of Danish migration, and I have family in East Anglia, right in the firing-line. Fortunately they're on what counts as the high part of Suffolk.

 

[CapelDodger]

And of course the Carlsberg brewery is on top of a hill... in Frederiksberg. That's all you need, right there

Probably.

http://www.dpchallenge.com/image.php?IMAGE_ID=89102