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Thursday, March 19, 2015

Criticality

I know, hard to believe.

Criticality is a nuclear term that refers to the balance of neutrons in the system. “Subcritical” refers to a system where the loss rate of neutrons is greater than the production rate of neutrons and therefore the neutron population (or number of neutrons) decreases as time goes on.

Scientific explanation

Sunday, March 15, 2015

The Holocene temperature conundrum (edited May 5 2021)

The paper (no longer works)  The paper --> archive.org ... another link to the paper

"The question is, 'Who is right?'" Liu said. "Or, maybe none of us is completely right. It could be partly a data problem, since some of the data in last year's study contradicts itself. It could partly be a model problem because of some missing physical mechanisms."

This mystery is known as the "Holocene temperature conundrum," and it describes a debate that has gone on over how temperatures have changed during the Holocene, an epoch that describes the last 11,700 years of our planet's history. While some previous proxy reconstructions suggest that average Holocene temperatures peaked between 6,000 and 10,000 years ago and the planet cooled after this, climate models suggest that global temperatures have actually risen over the past 12,000 years, with the help of factors like rising greenhouse gas emissions and climate change.

A blog 
(mentions the Holocene Maximum, also called the Altithermal, something also not found on Wikipedia)

Another blog 
"The fact that all the world’s complex and expensive climate models can’t explain climate change since the last glacial period ended is one of the little talked about embarrassments of climate science."

Google scholar

Paleoclimate: The End Of The Holocene By Stefan Rahmstorf

The Holocene temperature conundrum, not found on Wikipedia

The paper is about climate models vs estimated global temperature trends.