Marcott's Climate Reconstruction For the past 11,000 Years  

Posted by Big Gav in

The Atlantic has a look at a new study of historical temperatures - We're Screwed: 11,000 Years' Worth of Climate Data Prove It

Back in 1999 Penn State climate scientist Michael Mann released the climate change movement's most potent symbol: The "hockey stick," a line graph of global temperature over the last 1,500 years that shows an unmistakable, massive uptick in the twentieth century when humans began to dump large amounts of greenhouse gases into the atmosphere. It's among the most compelling bits of proof out there that human beings are behind global warming, and as such has become a target on Mann's back for climate denialists looking to draw a bead on scientists.

Now it's gotten a makeover: A study published in Science reconstructs global temperatures further back than ever before -- a full 11,300 years. The new analysis finds that the only problem with Mann's hockey stick was that its handle was about 9,000 years too short.

2 comments

The following post, at Planet3 dot org, shows two graphs with the expected warming for this century tacked onto Marcott's temp reconstruction. One for climate sensitivity of 3 C warming/doubling CO2
The other for if the consensus is wrong and sensitivity is only 1.5 C for doubling CO2.

Both are stunning.

Why Climate Sensitivity is Not Policy-Relevant

http://planet3.org/2013/03/08/why-equilibrium-sensitivity-is-not-policy-relevant/

Not counting the 800,000 year antarctic ice core records of course ;-)

http://cdiac.ornl.gov/trends/co2/ice_core_co2.html

http://www.realclimate.org/index.php/archives/2005/11/650000-years-of-greenhouse-gas-concentrations/

On the site where I first saw this one idiot wanted to know why the data wasn't freely available - ignoring the fact that all the data is freely available in the supplement link below the link at Science. For a paper like this they should just open access the paper, not just the supplement.

http://www.sciencemag.org/content/339/6124/1198/suppl/DC1




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