Consistent With Chronicles, Antarctic Edition

Consistent With Chronicles, Antarctic Edition. By Roger Pielke, Jr
Prometheus, January 21st, 2009

Excerpts:

An new paper is out in Nature that argues that the Antarctic continent has been warming. In an AP news story, two of its authors (one is Michael Mann from the Real Climate blog) argue that this refutes the skeptics and is “consistent with” greenhouse warming:

“Contrarians have sometime grabbed on to this idea that the entire continent of Antarctica is cooling, so how could we be talking about global warming,” said study co-author Michael Mann, director of the Earth System Science Center at Penn State University. “Now we can say: no, it’s not true … It is not bucking the trend.”

The study does not point to man-made climate change as the cause of the Antarctic warming — doing so is a highly intricate scientific process — but a different and smaller study out late last year did make that connection.

“We can’t pin it down, but it certainly is consistent with the influence of greenhouse gases,” said NASA scientist Drew Shindell, another study co-author. Some of the effects also could be natural variability, he said.

Of course, not long ago we learned from Real Climate that a cooling Antarctica was “consistent with” greenhouse warming and thus the skeptics were wrong:

. . . we often hear people remarking that parts of Antarctica are getting colder, and indeed the ice pack in the Southern Ocean around Antarctica has actually been getting bigger. Doesn’t this contradict the calculations that greenhouse gases are warming the globe? Not at all, because a cold Antarctica is just what calculations predict… and have predicted for the past quarter century. . .

. . . computer models have improved by orders of magnitude, but they continue to show that Antarctica cannot be expected to warm up very significantly until long after the rest of the world’s climate is radically changed.

Bottom line: A cold Antarctica and Southern Ocean do not contradict our models of global warming. For a long time the models have predicted just that.

So a warming Antarctica and a cooling Antarctica are both “consistent with” model projections of global warming. [...]