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What ever happened to snowlover? he seemed so interested in predicting arctic sea ice extents and now; nothing from him. I wonder why?

I wondered that myself when I saw this story.

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Good riddance to the denialist, whose rehashed arguments were untenable more each day.

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2012 is a genuine record low for Arctic Sea Ice over the last 30 years, 2011 had conflicting places for the minimum sea ice extent.

It should be interesting to see the studies on the 2012 record low, and how much natural variability played in relation to regional climate change in the Arctic. A large chunk of the sea ice melt occured with a very strong area of low pressure that significantly compacted the ice.

It should also be noted that the southern hemisphere experienced it's 2nd highest ice extent on record about a week ago.

small technical point; Isn't it winter in the Antarctic now? and don't we know why antarctic sea ice is expanding in the summer anyway?

http://news.nationalgeographic.com/news ... vironment/

Does that mean there was less sea ice in 1982?

Extent is area not volume. Volume would be the determination of amount.

http://nsidc.org/cryosphere/seaice/char ... rence.html

_________________
With friends like Guido, you will not have enemies for long.

“Intellect is invisible to the man who has none”
Arthur Schopenhauer

"The difference between genius and stupidity is that genius has its limits."
Albert Einstein

There was more Arctic Sea Ice in 1982. There was probably slightly less Antarctic Sea Ice in 1982 than there is now.

However, there were periods in Earth's History with significantly less Sea Ice than today, making this current period not very unusual (Funder et al. 2011).

Of course.

Some people try and argue that it's the Ozone Hole that has created circulation changes that have managed to cool Antarctica over the last 30 years, but I don't buy that explaination, especially since the Ozone Hole has recovered somewhat recently, and we have continued to see an increase in Antarctic Sea Ice.

Perhaps it is the same reason for why the Arctic Sea Ice is declining... the oceanic oscillations.

I am as always not convince by pretty graphs, also it is a graph of a range of simulations. Very ropey.

How does the sea shell evidence hold up?

I think that the circulation changes are what has insulated Antarctica (apart from West Antarctica) from global warming explains well the (geographical) distribution of the sea ice build-up and loss in Antarctica. I believe that there is evidence that ozone plays a part in the circulation changes, but also evidence that it has not.



Depending on your meaning of "somewhat". It is still near the deepest and and largest it has ever been, give or take only a few percent, whereas the minimum O₃ concentration in the hole is still half what it was in 1979.



I believe the cause of the declining Arctic sea ice is much less complicated. It is attributed to anthropogenic global warming. If it were due to oscillations, it would be oscillating, not declining.

...

Why arctic sea ice shouldent leave anyone cold

The arctic is a long way from me why should I care what happens up there? this is why;


http://neven1.typepad.com/blog/2012/08/ ... .html#more

bump this to the top because it's very important at the moment.

http://www.csmonitor.com/Science/2012/0 ... -low-video

Ozone may have contributed to the cooling of Antarctica, but I think that we need to understand all of the processes first, before we say things with absolute certainty.

Stratospheric Temperatures have started increasing recently (since 1995) which could represent a recovery in the Ozone Layer (Liu and Weng 2009).

I also think that Ozone Depletion is far more complicated than what most people make it out to be. Anthropogenic CFCs had played a major role in Ozone Depletion, but there were also major natural components like Solar Proton Storms that also depleted the Ozone layer.

I think that most of the warming in the Arctic is probably due to regional climate change up there amplified by Arctic Amplification, but you can not deny that natural variability has played a significant role in Arctic Sea Ice depletion. Various studies that I have read estimate the contribution from natural variability to sea ice decline to be around 40-50% or so.