- Nov 10, 2014
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Common sense 101 for gas holding capabilities of water also covered in any introduction to chemistry class. Regarding the belated spikes, makes perfect sense to me when you consider permafrost melting and methane hydrates releasing their payload into the atmosphere.
The NASA quote stated that carbon dioxide levels in ice cores recorded atmospheric level shifts. post 844
Post 852 responded "This is totally false. Ice core data show just the opposite: CO2 levels always rose about 800 years (average, I think) after temperatures rose."
My request for a citation was about the conclusion that temperatures on earth rose about 800 years before the carbon dioxide layers in the ice.
In response, the poster cited to Joanne ["Nova"] Codling. She asserts the 800 year delay, but also admits the rising carbon dioxide levels.
By looking into the citation concerning the 800 delay assertion, I found updated peer review research from Science magazine:
The Scientific American published information about the more updated and complete research, which narrows the gap to closer to 200 years.
"His team compiled an extensive record of Antarctic temperatures and CO2 data from existing data and five ice cores drilled in the Antarctic interior over the last 30 years. Their results, published February 28 in Science, show CO2 lagged temperature by less than 200 years, drastically decreasing the amount of uncertainty in previous estimates."
...
"Snowpack becomes progressively denser from the surface down to around 100 meters, where it forms solid ice. Scientists use air trapped in the ice to determine the CO2 levels of past climates, whereas they use the ice itself to determine temperature. But because air diffuses rapidly through the ice pack, those air bubbles are younger than the ice surrounding them. This means that in places with little snowfall—like the Dome C ice core—the age difference between gas and ice can be thousands of years. Parrenin’s team addresses these concerns with a new method that establishes the different ages of the gas and ice."
https://www.scientificamerican.com/article/ice-core-data-help-solve/