New research utilizing the DNA of dinoflagellate (Polarella glacialis) indicates that, 14,000 years ago, when the atmospheric CO2 concentration is thought to have been 230 ppm, the studied Arctic region (Yermak Plateau) was sea ice-free year-round.
“Around 14.0-13.9 cal kyr BP, a short-lived year-round, ice-free, open ocean occurred.”
During the Early to Middle Holocene (10,000 to 4,000 years ago), Arctic sea ice was seasonal, dominated by first-year ice that did not survive the summer melt season.
“The Holocene Yermak Plateau is characterized by a seasonal sea ice cover, which my consist mainly of first-year sea ice … a large part of first-year ice, as opposed to seasonally drifted multi-year ice.”
Today, at 430 ppm CO2, Arctic sea ice is increasingly first-year, but a “multi-year environment” persists. Multi-year sea ice has survived at least one summer melt season, and it continues to thicken over multiple years.
The current phase is similar to the sea ice conditions that predominated ~16,000 years ago, or during the last glacial.
“…a marginal sea ice cover ca. 16 cal kyr BP [characterized by] first-year sea ice in a multi-year sea ice environment, a setting not unlike today.”
If the Arctic can be sea ice-free year-round when CO2 is 230 ppm, but dominated by multi-year ice when the CO2 concentration is 430 ppm, this does not support the alarmist claims that high CO2 concentrations are responsible for enhanced Arctic sea ice melt.
Another failure of the CO2 control knob .
When will they ever learn…
😉
There is a CO2 control knob on their panel..
… but behind the panel, it is not connected to anything !! 😉
Much like their brains.
I also wonder how polar bears survived without sea ice and without Coca Cola.
For a long time Pepsi had the slogan “Twice as Much for a Nickle”
{12 oz while Coke was 6 oz and cost a dime}
Naturally the Polar Bears switched to Pepsi.
Maybe every true believer in the “climate crisis” should be given a case of Coca-Cola and be sent off to make friends with the Polar Bears.
If the past is any indication, never? If anything science is humbling, as the data (a dirty word in many CO2 control knob circles) often proves your assumptions wrong, yet many scientists seem to have ego without end.
When the real world keeps telling you your hypothesis is wrong and your mind doesn’t change, you are no “scientist.”
One is really puzzled why they do not hindcast that far back.
Oh. Wait…..
But the CO2 Control Knob is….. The Golden Ticket!
Very nice.
As with most proxy studies, I tend to take them with a grain of salt. If Mann is involved, a Grand Canyon full of salt.
The paleo records consistently show temperature starts falling at maximum co2 and starts increasing at minimum co2. This is the same as a control knob that when turned to maximum the volume goes down, and when the knob is turned to minimum the volume goes up.
Saying “this does not support the alarmist claims” is quite an understatement. For those of us who respect the scientific method, such data disconnect falsifies the alarmist claims. But the notion that the presence of a magical trace gas in the atmosphere could act in any way similar to a greenhouse covering was always ridiculous.