Originally
posted by
Heston:
Vostok ice core samples fluff all over the man made global warming climate change myth
Ice core samples 101
Ever wonder how those little bubbles of atmosphere get into that solid ice? That ice is rarely flash-frozen like your Gorton's fish sticks and tater tots
They are captured in and by new snowfall.
It can take tens, hundreds, even thousands of years for that snowfall to change in density as the weight of layers upon layers of new snowfalls accumulate and compress it from loosely compacted snow, to a frozen slush, and finally to solid ice at around 30 meters depth That's a ballpark figure, it can be 3x that and I believe it is in the area of the Vostok Station due to such little annual snowfall.
Think glacial formation and you'll get the idea.
That air trapped in the slowly forming icepack does not stay with the particular layer of snow that originally segregated it from the surface atmosphere. This layer between surface atmosphere and icepack is called the firn zone, and gasses can move around in the firn, almost always moving upward to the less densely packed firn.
40+ yrs ago when the study of ice cores was in its infancy it was thought you could date the ice, extract the trapped air and determine its chemical composition, and tie the chemistry directly to the layer of ice that it was extracted from.
This resulted in very confusing numbers which led to bad conclusions that is still used by publications dedicated to denying climate change, even though we've known for 30-35 years that the bubbles in core ice samples are younger than the ice surrounding it. And the longer it takes the firn to transition to solid ice, the younger the air bubbles will be in the layer of surrounding ice.
The atmospheric samples extracted from those core samples are now dated separately, using the isotope Nitrogen 15.
Your source is is either ancient or deceiving you.
http://www.iceandclimate.nbi.ku.dk/...alysing_gasses/firn_zone/
https://www.researchgate.net/...2f5101825a7737a000000.pdf
One thing that's notable about the overall warming of the Earth - it is thought that most of the significant warming events of the past were initiated by the release of methane due to volcanic activity. Methane has 25x the effect of CO2.
The curreent warming is different. It's being driven by the rise in atmospheric CO2 which although has a lesser effect stays in the atmosphere much longer than methane. The warming of the oceans and the loss of forests world-wide result in less of a natural carbon sink and it's obvious that the earth cannot keep up with the 9.8 gigatonnes of carbon emissions pumped into the atmosphere annually from the use of fossil fuels.
And now that frozen methane found in permafrost and ocean hydrates is starting to thaw, some at depths where it goes straight to gas.
http://www.washington.edu/...tons-of-seafloor-methane/
It's looking like we can expect a six to eight meter rise in sea level by the 2050s. With 80% of the world's population living within 60 miles of the coast, we will be seeing massive human migration.
George Carlin is great, but the thing is, he's dead. Much of the data we've gained from new technologies that allow us to measure the driving mechanisms of climate change and the resulting realization that vast change can happen in decades instead of centuries was not around when George started decomposing.
To anyone with kids and grandkids, we've got some 'splaning to do. They will not be inheriting the same planet we did.
If you're gonna be a science denier, please don't vote.
The rest of us want you to get out of the fluffing way.
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