Antarctic ice

[jc456]

I know the Ice Sheet is grounded on the sea floor. But I believe the statement was surface ice was melting. Surface in my world is above water on land.

I believe it was old scrocks that said it.

Well, no, JC, I did not say it.

Well old sckrocks, yes you did!!! I quoted it. Oops...

Shameful to lie like that.

Link, asshole, link.

Link for what? Your post was #6. My response was #16. What is it you supposedly need?

What everyone is "needing" from you, JustCrazy, is some indication that your posts aren't being generated by a spam-bot or a mental patient. Since your posts, like this last one quoted above, are just vacuous noise without any rational or even intelligible content, there is also the strong possibility that you are just utterly retarded.

I'm sorry, did you want something?

 

[Mustang]

Growth Of Antarctic Sea Ice A Warning Bell For Coastal Flooding

The stunning outward spread of ice floes atop the seas surrounding the South Pole has been caused by cold freshwater flowing out of melting Antarctic glaciers. (Shifting winds may also be playing a role in the breaking of previous Austral sea ice records.) That melting is forming layers of unusually cold and relatively salt-free surface waters in the region, the tops of which are being frosted with layers of blue-white ice.

Those layers of cold water could recast the southern stretches of the influentialAtlantic Meridional Overturning Circulation, which ferries water between tropical and polar regions, all the way from the Arctic to the Antarctic — with planet-churning consequences. Recent modeling indicates that these cold-water layers also formed as Antarctica melted during the prehistoric past, when they blocked warm water, which gets carried by deepwater currents to the Southern Ocean from the tropics, from surfacing.

At the surface, that warm water normally sloughs its excess heat into the atmosphere, cools down, then flows back north — typically a standard feature of the Atlantic’s circulation system. Without that Antarctic upwelling, the new study, which waspublished in Nature Communications, warns that the ice sheet is in danger of beingmelted from beneath at a hastening pace.

“We found out that if you put a certain amount of freshwater into the Southern Ocean around Antarctica, then basically it reduces this overturning — it reduces the upwelling of that warm water,” said the study’s lead author, Nick Golledge, a scientist at the Victoria University of Wellington’s Antarctic Research Center in New Zealand. “All that heat just gets trapped at a depth where it can melt the base of the ice shelves and the grounded ice that’s sitting in the ocean.”

The paradox of the expanding Antarctic Sea Ice is rather well explained. And it doesn't bode well for the future.

Fresh water doesn't freeze ANY faster (or differently) than salt water. Or so I would expect a conservative to argue.

 

[jc456]

Growth Of Antarctic Sea Ice A Warning Bell For Coastal Flooding

The stunning outward spread of ice floes atop the seas surrounding the South Pole has been caused by cold freshwater flowing out of melting Antarctic glaciers. (Shifting winds may also be playing a role in the breaking of previous Austral sea ice records.) That melting is forming layers of unusually cold and relatively salt-free surface waters in the region, the tops of which are being frosted with layers of blue-white ice.

Those layers of cold water could recast the southern stretches of the influentialAtlantic Meridional Overturning Circulation, which ferries water between tropical and polar regions, all the way from the Arctic to the Antarctic — with planet-churning consequences. Recent modeling indicates that these cold-water layers also formed as Antarctica melted during the prehistoric past, when they blocked warm water, which gets carried by deepwater currents to the Southern Ocean from the tropics, from surfacing.

At the surface, that warm water normally sloughs its excess heat into the atmosphere, cools down, then flows back north — typically a standard feature of the Atlantic’s circulation system. Without that Antarctic upwelling, the new study, which waspublished in Nature Communications, warns that the ice sheet is in danger of beingmelted from beneath at a hastening pace.

“We found out that if you put a certain amount of freshwater into the Southern Ocean around Antarctica, then basically it reduces this overturning — it reduces the upwelling of that warm water,” said the study’s lead author, Nick Golledge, a scientist at the Victoria University of Wellington’s Antarctic Research Center in New Zealand. “All that heat just gets trapped at a depth where it can melt the base of the ice shelves and the grounded ice that’s sitting in the ocean.”

The paradox of the expanding Antarctic Sea Ice is rather well explained. And it doesn't bode well for the future.

Fresh water doesn't freeze ANY faster (or differently) than salt water. Or so I would expect a conservative to argue.

The poles will be ice free......hmmmm hasn't happened. hmmmmmmmm

 

[Mustang]

Growth Of Antarctic Sea Ice A Warning Bell For Coastal Flooding

The stunning outward spread of ice floes atop the seas surrounding the South Pole has been caused by cold freshwater flowing out of melting Antarctic glaciers. (Shifting winds may also be playing a role in the breaking of previous Austral sea ice records.) That melting is forming layers of unusually cold and relatively salt-free surface waters in the region, the tops of which are being frosted with layers of blue-white ice.

Those layers of cold water could recast the southern stretches of the influentialAtlantic Meridional Overturning Circulation, which ferries water between tropical and polar regions, all the way from the Arctic to the Antarctic — with planet-churning consequences. Recent modeling indicates that these cold-water layers also formed as Antarctica melted during the prehistoric past, when they blocked warm water, which gets carried by deepwater currents to the Southern Ocean from the tropics, from surfacing.

At the surface, that warm water normally sloughs its excess heat into the atmosphere, cools down, then flows back north — typically a standard feature of the Atlantic’s circulation system. Without that Antarctic upwelling, the new study, which waspublished in Nature Communications, warns that the ice sheet is in danger of beingmelted from beneath at a hastening pace.

“We found out that if you put a certain amount of freshwater into the Southern Ocean around Antarctica, then basically it reduces this overturning — it reduces the upwelling of that warm water,” said the study’s lead author, Nick Golledge, a scientist at the Victoria University of Wellington’s Antarctic Research Center in New Zealand. “All that heat just gets trapped at a depth where it can melt the base of the ice shelves and the grounded ice that’s sitting in the ocean.”

The paradox of the expanding Antarctic Sea Ice is rather well explained. And it doesn't bode well for the future.

Fresh water doesn't freeze ANY faster (or differently) than salt water. Or so I would expect a conservative to argue.

The poles will be ice free......hmmmm hasn't happened. hmmmmmmmm

If you took all the ice on the Antarctic and placed it in the middle of the USA, it would STILL take several years for it to melt due to the sheer volume of ice. Even people born today won't live long enough to see all that ice melt.

 

[jc456]

Growth Of Antarctic Sea Ice A Warning Bell For Coastal Flooding

The stunning outward spread of ice floes atop the seas surrounding the South Pole has been caused by cold freshwater flowing out of melting Antarctic glaciers. (Shifting winds may also be playing a role in the breaking of previous Austral sea ice records.) That melting is forming layers of unusually cold and relatively salt-free surface waters in the region, the tops of which are being frosted with layers of blue-white ice.

Those layers of cold water could recast the southern stretches of the influentialAtlantic Meridional Overturning Circulation, which ferries water between tropical and polar regions, all the way from the Arctic to the Antarctic — with planet-churning consequences. Recent modeling indicates that these cold-water layers also formed as Antarctica melted during the prehistoric past, when they blocked warm water, which gets carried by deepwater currents to the Southern Ocean from the tropics, from surfacing.

At the surface, that warm water normally sloughs its excess heat into the atmosphere, cools down, then flows back north — typically a standard feature of the Atlantic’s circulation system. Without that Antarctic upwelling, the new study, which waspublished in Nature Communications, warns that the ice sheet is in danger of beingmelted from beneath at a hastening pace.

“We found out that if you put a certain amount of freshwater into the Southern Ocean around Antarctica, then basically it reduces this overturning — it reduces the upwelling of that warm water,” said the study’s lead author, Nick Golledge, a scientist at the Victoria University of Wellington’s Antarctic Research Center in New Zealand. “All that heat just gets trapped at a depth where it can melt the base of the ice shelves and the grounded ice that’s sitting in the ocean.”

The paradox of the expanding Antarctic Sea Ice is rather well explained. And it doesn't bode well for the future.

Fresh water doesn't freeze ANY faster (or differently) than salt water. Or so I would expect a conservative to argue.

The poles will be ice free......hmmmm hasn't happened. hmmmmmmmm

If you took all the ice on the Antarctic and placed it in the middle of the USA, it would STILL take several years for it to melt due to the sheer volume of ice. Even people born today won't live long enough to see all that ice melt.

hmm.. then I wonder why the predictions were made by the 2000s? So has the mass declined?

 

[Mustang]

Growth Of Antarctic Sea Ice A Warning Bell For Coastal Flooding

The stunning outward spread of ice floes atop the seas surrounding the South Pole has been caused by cold freshwater flowing out of melting Antarctic glaciers. (Shifting winds may also be playing a role in the breaking of previous Austral sea ice records.) That melting is forming layers of unusually cold and relatively salt-free surface waters in the region, the tops of which are being frosted with layers of blue-white ice.

Those layers of cold water could recast the southern stretches of the influentialAtlantic Meridional Overturning Circulation, which ferries water between tropical and polar regions, all the way from the Arctic to the Antarctic — with planet-churning consequences. Recent modeling indicates that these cold-water layers also formed as Antarctica melted during the prehistoric past, when they blocked warm water, which gets carried by deepwater currents to the Southern Ocean from the tropics, from surfacing.

At the surface, that warm water normally sloughs its excess heat into the atmosphere, cools down, then flows back north — typically a standard feature of the Atlantic’s circulation system. Without that Antarctic upwelling, the new study, which waspublished in Nature Communications, warns that the ice sheet is in danger of beingmelted from beneath at a hastening pace.

“We found out that if you put a certain amount of freshwater into the Southern Ocean around Antarctica, then basically it reduces this overturning — it reduces the upwelling of that warm water,” said the study’s lead author, Nick Golledge, a scientist at the Victoria University of Wellington’s Antarctic Research Center in New Zealand. “All that heat just gets trapped at a depth where it can melt the base of the ice shelves and the grounded ice that’s sitting in the ocean.”

The paradox of the expanding Antarctic Sea Ice is rather well explained. And it doesn't bode well for the future.

Fresh water doesn't freeze ANY faster (or differently) than salt water. Or so I would expect a conservative to argue.

The poles will be ice free......hmmmm hasn't happened. hmmmmmmmm

If you took all the ice on the Antarctic and placed it in the middle of the USA, it would STILL take several years for it to melt due to the sheer volume of ice. Even people born today won't live long enough to see all that ice melt.

hmm.. then I wonder why the predictions were made by the 2000s? So has the mass declined?

The "2000's" lasts a thousand years.

 

[jc456]

Growth Of Antarctic Sea Ice A Warning Bell For Coastal Flooding

The stunning outward spread of ice floes atop the seas surrounding the South Pole has been caused by cold freshwater flowing out of melting Antarctic glaciers. (Shifting winds may also be playing a role in the breaking of previous Austral sea ice records.) That melting is forming layers of unusually cold and relatively salt-free surface waters in the region, the tops of which are being frosted with layers of blue-white ice.

Those layers of cold water could recast the southern stretches of the influentialAtlantic Meridional Overturning Circulation, which ferries water between tropical and polar regions, all the way from the Arctic to the Antarctic — with planet-churning consequences. Recent modeling indicates that these cold-water layers also formed as Antarctica melted during the prehistoric past, when they blocked warm water, which gets carried by deepwater currents to the Southern Ocean from the tropics, from surfacing.

At the surface, that warm water normally sloughs its excess heat into the atmosphere, cools down, then flows back north — typically a standard feature of the Atlantic’s circulation system. Without that Antarctic upwelling, the new study, which waspublished in Nature Communications, warns that the ice sheet is in danger of beingmelted from beneath at a hastening pace.

“We found out that if you put a certain amount of freshwater into the Southern Ocean around Antarctica, then basically it reduces this overturning — it reduces the upwelling of that warm water,” said the study’s lead author, Nick Golledge, a scientist at the Victoria University of Wellington’s Antarctic Research Center in New Zealand. “All that heat just gets trapped at a depth where it can melt the base of the ice shelves and the grounded ice that’s sitting in the ocean.”

The paradox of the expanding Antarctic Sea Ice is rather well explained. And it doesn't bode well for the future.

Fresh water doesn't freeze ANY faster (or differently) than salt water. Or so I would expect a conservative to argue.

The poles will be ice free......hmmmm hasn't happened. hmmmmmmmm

If you took all the ice on the Antarctic and placed it in the middle of the USA, it would STILL take several years for it to melt due to the sheer volume of ice. Even people born today won't live long enough to see all that ice melt.

hmm.. then I wonder why the predictions were made by the 2000s? So has the mass declined?

The "2000's" lasts a thousand years.

it was by 2013, not one thousand years. Nice try. So what about them libs trying to scare the public that the ice would be gone in their lifetime when you the smart one knew better.

So see, we are sometimes smarter than the science.

 

[westwall]

Growth Of Antarctic Sea Ice A Warning Bell For Coastal Flooding

The stunning outward spread of ice floes atop the seas surrounding the South Pole has been caused by cold freshwater flowing out of melting Antarctic glaciers. (Shifting winds may also be playing a role in the breaking of previous Austral sea ice records.) That melting is forming layers of unusually cold and relatively salt-free surface waters in the region, the tops of which are being frosted with layers of blue-white ice.

Those layers of cold water could recast the southern stretches of the influentialAtlantic Meridional Overturning Circulation, which ferries water between tropical and polar regions, all the way from the Arctic to the Antarctic — with planet-churning consequences. Recent modeling indicates that these cold-water layers also formed as Antarctica melted during the prehistoric past, when they blocked warm water, which gets carried by deepwater currents to the Southern Ocean from the tropics, from surfacing.

At the surface, that warm water normally sloughs its excess heat into the atmosphere, cools down, then flows back north — typically a standard feature of the Atlantic’s circulation system. Without that Antarctic upwelling, the new study, which waspublished in Nature Communications, warns that the ice sheet is in danger of beingmelted from beneath at a hastening pace.

“We found out that if you put a certain amount of freshwater into the Southern Ocean around Antarctica, then basically it reduces this overturning — it reduces the upwelling of that warm water,” said the study’s lead author, Nick Golledge, a scientist at the Victoria University of Wellington’s Antarctic Research Center in New Zealand. “All that heat just gets trapped at a depth where it can melt the base of the ice shelves and the grounded ice that’s sitting in the ocean.”

The paradox of the expanding Antarctic Sea Ice is rather well explained. And it doesn't bode well for the future.

Fresh water doesn't freeze ANY faster (or differently) than salt water. Or so I would expect a conservative to argue.

The poles will be ice free......hmmmm hasn't happened. hmmmmmmmm

If you took all the ice on the Antarctic and placed it in the middle of the USA, it would STILL take several years for it to melt due to the sheer volume of ice. Even people born today won't live long enough to see all that ice melt.

What's funny is you have no idea how long it would take! Here's a hint bucko, it's more than "several years"

 

[Old Rocks]

It would take only a small amount of the ice on Antarctica and Greenland to raise the sea level a meter. And that would affect nearly every seaport in the world.

 

[westwall]

It would take only a small amount of the ice on Antarctica and Greenland to raise the sea level a meter. And that would affect nearly every seaport in the world.

Tell the class how little and how long it would take then.

 

[Billy_Bob]

This one ought to be good!

Lots of popcorn.. Check

 

[Crick]

Excerpts from West Antarctic Ice Sheet - Wikipedia the free encyclopedia

In January 2006, in a UK government-commissioned report, the head of the British Antarctic Survey, Chris Rapley, warned that this huge west Antarctic ice sheet may be starting to disintegrate. It has been hypothesised that this disintegration could raise sea levels by approximately 3.3 metres (10 ft).[9] (If the entire West Antarctic Ice Sheet were to melt, this would contribute 4.8 m to global sea level.)[10]Rapley said a previous (2001) Intergovernmental Panel on Climate Change (IPCC) report that played down the worries of the ice sheet's stability should be revised. "I would say it is now an awakened giant. There is real concern." [5]

Polar ice experts from the U.S. and U.K. met at the University of Texas at Austin in March, 2007 for the West Antarctic Links to Sea-Level Estimation (WALSE) Workshop. The experts discussed a new hypothesis that explains the observed increased melting of the West Antarctic Ice Sheet. They proposed that changes in air circulation patterns have led to increased upwelling of warm, deep ocean water along the coast of Antarctica and that this warm water has increased melting of floating ice shelves at the edge of the ice sheet.[13] An ocean model has shown how changes in winds can help channel the water along deep troughs on the sea floor, toward the ice shelves of outlet glaciers.[14] The exact cause of the changes in circulation patterns is not known and they may be due to natural variability. However, this connection between the atmosphere and upwelling of deep ocean water provides a mechanism by which human induced climate changes could cause an accelerated loss of ice from WAIS.[14] Recently published data collected from satellites support this hypothesis, suggesting that the west Antarctic ice sheet is beginning to show signs of instability.[4][15]

On 12 May 2014, It was announced that two teams of scientists said the long-feared collapse of the Ice Sheet had begun, kicking off what they say will be a centuries-long, "unstoppable" process that could raise sea levels by 1.2 to 3.6 metres.[16] They estimate that rapid drawdown of Thwaites Glacier will begin in 200 – 1000 years.[17] (Scientific source articles: Rignot et al 2014 [18] and Joughin et al 2014.[19])

Warming
The West Antarctic ice sheet has warmed by more than 0.1 °C/decade in the last 50 years, and the warming is the strongest in winter and spring. Although this is partly offset by fall cooling in East Antarctica, this effect was restricted to the 1980s and 1990s. The continent-wide average surface temperature trend of Antarctica is positive and significant at >0.05 °C/decade since 1957.[20] This warming of WAIS is strongest in the Antarctic Peninsula. In 2012, the temperature records for the ice sheet were reanalyzed with a conclusion that since 1958, the West Antarctic ice sheet had warmed by 2.4 °C, almost double the previous estimate. Some scientists now fear that the WAIS could now collapse like the Larsen B Ice Shelf did in 2002.[21]

References
Notes

1. In this case the ice is effectively moving upslope towards the sea.

Citations

1. Lythe, Matthew B.; Vaughan, David G. (June 2001). "BEDMAP: A new ice thickness and subglacial topographic model of Antarctica". Journal of Geophysical Research 106 (B6): 11335–11352. Bibcode:2001JGR...10611335L. doi:10.1029/2000JB900449.
2. Anderson, John B. (1999). Antarctic marine geology. Cambridge University Press. p. 59. ISBN 0-521-59317-4.
3. Ice Shelves, Antarctic and Southern Ocean Coalition[dead link]
4. Rignot, E. (2008). "Changes in West Antarctic ice stream dynamics observed with ALOS PALSAR data". Geophysical Research Letters 35 (12): L12505.Bibcode:2008GeoRL..3512505R. doi:10.1029/2008GL033365. edit
5. Jenny Hogan, "Antarctic ice sheet is an 'awakened giant'", New Scientist, February 2, 2005
6. Rignot, E.; Bamber, J. L.; Van Den Broeke, M. R.; Davis, C.; Li, Y.; Van De Berg, W. J.; Van Meijgaard, E. (2008). "Recent Antarctic ice mass loss from radar interferometry and regional climate modelling". Nature Geoscience 1 (2): 106.Bibcode:2008NatGe...1..106R. doi:10.1038/ngeo102. edit
7. King, M. A.; Bingham, R. J.; Moore, P.; Whitehouse, P. L.; Bentley, M. J.; Milne, G. A. (2012). "Lower satellite-gravimetry estimates of Antarctic sea-level contribution". Nature491 (7425): 586–589. doi:10.1038/nature11621. PMID 23086145. edit
8. Hughes, Terence J. (1981). "The weak underbelly of the West Antarctic ice-sheet.".
9. Bamber J.L., Riva R.E.M., Vermeersen B.L.A., LeBroq A.M. (2009). "Reassessment of the potential sea-level rise from a collapse of the West Antarctic Ice Sheet". Science 324(5929): 901–3. Bibcode:2009Sci...324..901B. doi:10.1126/science.1169335.PMID 19443778.
10. Bamber J.L., Riva R.E.M., Vermeersen B.L.A., LeBroq A.M. (2009). "Reassessment of the potential sea-level rise from a collapse of the West Antarctic Ice Sheet (Supporting Online Material)". Science 324 (5929): 901–3. Bibcode:2009Sci...324..901B.doi:10.1126/science.1169335. PMID 19443778.
11. "West Antarctic ice sheet: Waking the sleeping giant?", Symposium, February 19, 2006
12. Jonathan Leake and Jonathan Milne, "Focus: The climate of fear", The Sunday Times — Britain, February 19, 2006
13. Statement: Thinning of West Antarctic Ice Sheet Demands Improved Monitoring to Reduce Uncertainty over Potential Sea-Level Rise (March 28, 2007)
14. Thoma, M.; Jenkins, A.; Holland, D.; Jacobs, S. (2008). "Modelling Circumpolar Deep Water intrusions on the Amundsen Sea continental shelf, Antarctica". Geophysical Research Letters 35 (18): L18602. Bibcode:2008GeoRL..3518602T.doi:10.1029/2008GL034939. edit
15. Kaufman, Mark (2008) "Escalating Ice Loss Found in Antarctica: Sheets Melting in an Area Once Thought to Be Unaffected by Global Warming" Washington Post (January 14) p. A01 online
16. Parts of West Antarctic ice sheet beginning slow alarming collapse studies show CTV News
17. Boyle, Alan (12 May 2014). "West Antarctic Ice Sheet's Collapse Triggers Sea Level Warning". Retrieved 12 May 2014.
18. Rignot, E., J. Mouginot, M. Morlighem, H. Seroussi and B. Scheuch (May 12, 2014)."Widespread, rapid grounding line retreat of Pine Island, Thwaites, Smith and Kohler glaciers, West Antarctica from 1992 to 2011". Geophysical Research Letters.doi:10.1002/2014GL060140.
19. Joughin, Ian, Benjamin E. Smith, Brooke Medley (May 12, 2014). "Marine Ice Sheet Collapse Potentially Underway for the Thwaites Glacier Basin, West Antarctica".Science. doi:10.1126/science.1249055.
20. Jump up^ Steig, E. J.; Schneider, D. P.; Rutherford, S. D.; Mann, M. E.; Comiso, J. C.; Shindell, D. T. (2009). "Warming of the Antarctic ice-sheet surface since the 1957 International Geophysical Year". Nature 457 (7228): 459–462. doi:10.1038/nature07669.PMID 19158794. edit
21. Matt McGrath (23 December 2012). "West Antarctic Ice Sheet warming twice earlier estimate". BBC News. Retrieved 16 February 2013

Twelve of these references are peer-reviewed studies. Swallow your popcorn and tell us about your references.

 

[SwimExpert]

It has been hypothesised

Enough said....

 

[Crick]

I see you've not gotten any more intelligent in your absence.

 

[jc456]

I see you've not gotten any more intelligent in your absence.

That's ok, you have no idea what the word means!!!! WiNNiNg.

Hey why are you on here? What is your objective here?

 

[IanC]

so the Antarctic isnt warming up appreciably, and likely not at all.

we are being told that warmer temps cause more sea ice extent.

nope, that doesnt seem to hold up either.

 

[Youch]

Growth Of Antarctic Sea Ice A Warning Bell For Coastal Flooding

The stunning outward spread of ice floes atop the seas surrounding the South Pole has been caused by cold freshwater flowing out of melting Antarctic glaciers. (Shifting winds may also be playing a role in the breaking of previous Austral sea ice records.) That melting is forming layers of unusually cold and relatively salt-free surface waters in the region, the tops of which are being frosted with layers of blue-white ice.

Those layers of cold water could recast the southern stretches of the influentialAtlantic Meridional Overturning Circulation, which ferries water between tropical and polar regions, all the way from the Arctic to the Antarctic — with planet-churning consequences. Recent modeling indicates that these cold-water layers also formed as Antarctica melted during the prehistoric past, when they blocked warm water, which gets carried by deepwater currents to the Southern Ocean from the tropics, from surfacing.

At the surface, that warm water normally sloughs its excess heat into the atmosphere, cools down, then flows back north — typically a standard feature of the Atlantic’s circulation system. Without that Antarctic upwelling, the new study, which waspublished in Nature Communications, warns that the ice sheet is in danger of beingmelted from beneath at a hastening pace.

“We found out that if you put a certain amount of freshwater into the Southern Ocean around Antarctica, then basically it reduces this overturning — it reduces the upwelling of that warm water,” said the study’s lead author, Nick Golledge, a scientist at the Victoria University of Wellington’s Antarctic Research Center in New Zealand. “All that heat just gets trapped at a depth where it can melt the base of the ice shelves and the grounded ice that’s sitting in the ocean.”

The paradox of the expanding Antarctic Sea Ice is rather well explained. And it doesn't bode well for the future.

Antarctic ice......growing.... must be caused be warming.

Phucking phools.....

 

[Crick]

I'm surprised Ian. I wouldn't touch the "work" of Bob Tisdale with a ten-foot pole.

Latest Southern Ocean research shows continuing deep ocean change mdash Australian Antarctic Division


Comparing detailed measurements taken during the Australian Antarctic program’s 2012 Southern Ocean marine science voyage to historical data dating back to 1970, scientists estimate there has been as much as a 60% reduction in the volume of Antarctic Bottom Water, the cold dense water that drives global ocean currents.

In an intensive and arduous 25-day observing program, temperature and salinity samples were collected at 77 sites between Antarctica and Fremantle. Such ship transects provide the only means to detect changes in the deep ocean.

The new measurements, which have not yet been published, suggest the densest waters in the world ocean are gradually disappearing and being replaced by less dense waters.

“The amount of dense Antarctic Bottom Water has contracted each time we’ve measured it since the 1970s,” said Dr Steve Rintoul, the voyage leader and oceanographer with the CSIRO and the Antarctic Climate and Ecosystems CRC. “There is now only about 40% as much dense water present as observed in 1970.”

The ocean profiles also show that the dense water formed around Antarctica has become less saline since 1970.

and

Recall hearing that a great portion of the surface cooling witnessed recently is due to warmed surface waters being replaced by cooler waters from the depths (the flip side of which would be responsible for the drop in the density of bottom waters observed in the article above). Well...:

You posted a version of this yourself. Did you not wonder what would have driven surface temperatures downward when your air temps were doing no such thing?

 

[IanC]

I'm surprised Ian. I wouldn't touch the "work" of Bob Tisdale with a ten-foot pole.

You posted a version of this yourself. Did you not wonder what would have driven surface temperatures downward when your air temps were doing no such thing?

are you saying that Tisdale is incapable of importing the data and graphing it up; or are you saying that the data is faulty; or are you saying that Tisdale is fraudulently changing the data before making the graphs?

I think someone would have caught Tisdale in the last ten years if he was changing the KNMI Climate Explorer data. dont you?

 

[Crick]

Why go to Tisdale when you can go to the people who actually collected, processed and published that data? What is Tisdale's value to you? Could it be that he collects and interpets the data of others in manners that result in an apparent display of what you want to see? I think it is.

Now, back to the real question. What do you believe has driven surface temperatures downward Ian, when you have no corresponding cold air temps at the surface to do so? And what has caused the 60% delta-rho (from temperature and salinity) of the Southern Ocean's bottom water?

Eh?