Antarctic Sea Ice Increase: Fodder for Global Warming Skeptics?

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antarctic200.jpgHold onto your hats, kids, because climate change skeptics are sure to have a field day with this one: Researchers have found that for the past 20 years, while ice in the Arctic has been rapidly decreasing, Antarctic sea ice has actually been increasing. “See?” The skeptics will say. “If the world really were getting warmer, then it wouldn’t be all cold and icy in the South Pole.”

But like many global warming denialist arguments, this one doesn’t leave a whole lot of room for scientific nuance. Not all that science is fully understood yet, but until it is, you can fire back at doubting Thomases with a few basic facts: For starters, South Pole ice is much thicker than North Pole ice (2 miles in the Antarctic vs. 6-10 feet in the Arctic). Also, the ice in the north sits on open ocean, so it gets warmed from beneath&8212;while in the south, much of the ice sits on a continent.

Sydney Indymedia e-mailed renowned NASA climate scientist James Hansen, and he kindly put the Antarctic trends in some context:

All of the models, and the observations, have the central parts of
Greenland and Antarctica growing faster because of global warming. This
is a consequence of warmer air holding more moisture, thus increasing
snowfall. But the net effect of warming on both continental ice sheets
is mass loss, the increased melting being a larger effect than the
increased snowfall.

And according to Hansen, not all of Antarctica’s sea ice is increasing:

He also said “The fact that West Antarctica is shedding mass at a
substantial rate, even though there is only small warming of
surrounding sea surface temperatures, is a telling fact in my opinion,
and a likely consequence of the warming ocean at depth, which affects
the ice shelves that buttress West Antarctica, as discussed in our
paper ‘Dangerous human-made interference with climate: a GISS modelE
study.'”

So there you have it: As usual, climate change is much more complex than skeptics would have us believe.

HERE ARE THE FACTS:

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As we wrote over the summer, traffic has been down at Mother Jones and a lot of sites with many people thinking news is less important now that Donald Trump is no longer president. But if you're reading this, you're not one of those people, and we're hoping we can rally support from folks like you who really get why our reporting matters right now. And that's how it's always worked: For 45 years now, a relatively small group of readers (compared to everyone we reach) who pitch in from time to time has allowed Mother Jones to do the type of journalism the moment demands and keep it free for everyone else.

Please pitch in with a donation during our fall fundraising drive if you can. We can't afford to come up short, and there's still a long way to go by November 5.

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