Throwing a bit of ice on some AGW claims
Lots of stuff coming in under the oil spill and McChrystal radar. For instance, Antarctic ice melt (“PIG” refers to Pine Island Glacier, to which some scientists have attempted to attribute melting to man made sources – i.e. AGW):
Many scientists have theorised that the PIG’s accelerating flow is due to global warming. However, recent research – including surveys beneath the bottom of the floating, projecting ice sheet by Blighty’s Autosub robot probe – indicate that this may not be the case.
It appears from the Autosub’s under-ice surveys that the PIG’s ice flow formerly ground its way out to sea across the top of a previously unknown rocky underwater ridge, which tended to hold it back. Many years ago, however, before the area was surveyed in much detail, the glacier’s floating outflow sheet separated from the ridge top which it had been grinding away at for millennia and so picked up speed. This also allowed relatively warm sea water to get up under the sheet and so increase melting and ease of movement.
“The discovery of the ridge has raised new questions about whether the current loss of ice from Pine Island Glacier is caused by recent climate change or is a continuation of a longer-term process that began when the glacier disconnected from the ridge,” says Dr Adrian Jenkins of the British Antarctic Survey.
Really? There’s debate about whether a rock ridge might protect it from warmer sea water and thus when it broke away from it, what was then in the sea melted faster?
If there is debate, it’s face-saving debate. Instead why not admit to the fact that the theory its melting was driven by AGW was flawed because the information being used for the hypothesis was flawed (inaccurate and incomplete). Those that did the study conclude “the glacier would have shown the same acceleration and thinning it has shown since the 1990s with or without climate change.”
Moving on, this time to Arctic ice. A new study, using a new technique to measure ice thickness and distribution in the polar region (where we’ve been consistently told by the AGW crowd we’d be ice free soon) yielded these results:
Overall the researchers conclude that the distribution of old Arctic ice has changed little since 2007 and what changes there have been are well within the range of natural variability. They speculate that the large ice loss seen in 2007 may have been offset by weather patterns since then that prevented further ice loss.
“There is still hope for the ice,” said Christian Hass, adding that in many ways thje ice is in better shape entering the melt season than it has been for years. He dismisses suggestions that a “tipping point” may soon be encountered that will result in catastrophic, runaway ice loss. Extreme melts there may be, but he considered they would be compensated for by rapid recoveries.
Al Gore call your publicist. It seems that 2007 may have been an anomoly, but not one that was outside of the range any credible scientist would dismiss as “natural”.
And that also applies to Swiss glaciers as well – another favorite of the AGW crowd:
Matthias Huss and colleagues gather about 10,000 observations of glaciers in the Swiss Alps (daily ice melt, snow accumulation, ice and snow volume) made over the past 100 years and used them to create a computer model of some 30 glaciers.
Visible in the data was the influence of the very poorly understood Atlantic Multidecadal Oscillation (AMO) – a regular change in sea surface temperatures on timescales of up to 60 years or more.
The glaciers studied generally lost mass during the 20th century although there were brief periods of mass gain in the second decade and in the 1970’s. In the 1940’s and since 1980 mass has been lost as more precipitation fell as rain rather than snow.
Last December, Huss published a study that showed that Swiss glaciers melted at a faster rate in the 1940’s than they do nowadays, and that glacier melting is influenced by long-term changes in solar radiation.
You know, that big yellow hot thing that hangs in the sky every day? Yeah, that. Note too that glaicer melt was more pronounced in the ’40s than now.
In conclusion, the Swiss Alps now join Mt Kilimanjaro as having had a misleading press. We now know that Mt Kilimanjaro’s dramatic shrinkage of its summit glacier is due to decadal fluctuation in air moisture and not man’s effects. The changes seen in the Swiss Alps likewise seem to have a greater natural, perhaps even dominant, variation than has recently been reported. Glaciers are highly sensitive to many environmental factors, most of which cannot be laid at the door of man-made climate change.
All that to say you should be “cool” to any further suggestions by the Al Gore set that man is melting the ice caps and glaciers. Seems, as usual, to be a “misinterpretation” (one I see as deliberate) of natural phenomenon.
I’ll leave the “why” up to you, but the big three that come to mind for me are power, money and control. I’d also add that it appears that real science is finally beginning to prevail and show the AGW scare to be the big scam most of us skeptics thought it to be from the beginning.