Could disruption of heat circulation from the Atlantic to the Arctic have caused D-O events?
Can you think of any other phenomenon which could have caused D-O events?
There's my evidence.
How long until the Climate Cult re-appears, now that there's hot weather?
- Thread starter CrazyTrader55
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Can you think of any other phenomenon which could have caused D-O events?
There's my evidence.
Do you now claim we are undergoing a D-O event?
No. I'm claiming that D-O events are direct evidence of the ocean affecting the climate at each pole and everything in between.
And if you want to disprove it then you will need to explain what caused D-O events to happen. Why did temperatures fluctuate 5C to 8C over the course of several DECADES.
D-O events do not support your claim that interruptions in ocean currents are responsible for the glacial cycle nor your claim that the current warming is simply part of the glacial cycle. The dominant theory as to the cause of D-O events is an interaction between the atmosphere and ice pack, not the oceans.
So, another in a long, long, long line of Ding MISTAKES.
How did the interaction between the atmosphere and ice packs cause temperatures to rise and fall by 5C to 8C?
What interaction?
HikerGuy83
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Why don't you answer his question first ?
Your little game of cat-and-stupid(you) is pretty obvious.
See post #124.
YOU are the one who brought D-O events into this forum in the first place and into this conversation. Have YOU not read up on the theories as to their cause?
Yes, I did bring up D-O events and I have read up on the causes which is why I believe changing ocean currents is responsible for glacial cycles. Because that is what has been written.
Your explanation - which wasn't an explanation at all - was bullshit arm waving. Please prove me wrong and explain your nebulous BS interface argument.
Because they (i.e. IPCC) are attributing all warming to CO2 when it's not.
Suggestions of solar and oceanic causes have been made, but no clear proof is yet available. In addition, some studies suggest that D-O events may be triggered by complex interactions between the atmosphere, the polar ice pack, and the oceans that affect how heat energy is transported toward the poles.May 31, 2024
Dansgaard-Oeschger event | Definition, Causes, & Facts
Britannica
https://www.britannica.com › ... › Earth Sciences
What caused Heinrich and Dansgaard–Oeschger events? The cause of these glacial events is still under debate. During the last glacial time, large ice sheets rimmed the North Atlantic. At certain times, these ice sheets released large amounts of freshwater into the North Atlantic. Heinrich events are an extreme example of this, when the Laurentide ice sheet disgorged excessively large amounts of freshwater into the Labrador Sea in the form of icebergs. Scientists have hypothesized that these freshwater dumps reduced ocean salinity enough to slow deepwater formation and the thermohaline circulation. Since the thermohaline circulation plays an important role in transporting heat northward, a slowdown would cause the North Atlantic to cool. Later, as the addition of freshwater decreased, ocean salinity and deepwater formation increased and climate conditions recovered. Evidence for changes in deepwater formation supports the freshwater forcing hypothesis. Measurements from deep-sea sediments in the North Atlantic indicate reduction of deepwater formation during Heinrich events (McManus et al. 2004). Evidence for freshwater forcing and reduced deepwater formation during D-O events is more ambiguous. The initial trigger for freshwater releases has not yet been identified. One suggestion is that small, gradual changes in solar output could have influenced the timing of abrupt changes. Other ideas call upon natural oscillations of the ice sheets themselves or of ocean processes.
Causes
The processes behind the timing and amplitude of these events (as recorded in ice cores) are still unclear. The pattern in the Southern Hemisphere is different, with slow warming and much smaller temperature fluctuations. Indeed, the Vostok ice core was drilled before the Greenland cores, and the existence of Dansgaard–Oeschger events was not widely recognised until the Greenland (GRIP/GISP2) cores were done; after which there was some reexamination of the Vostok core to see if these events had somehow been "missed".[citation needed]
A closeup near 40 kyr BP, showing reproducibility between cores
The events appear to reflect changes in the North Atlantic Ocean circulation, perhaps triggered by an influx of fresh water[8] or rain.[12]
The events may be caused by an amplification of solar forcings, or by a cause internal to the earth system – either a "binge-purge" cycle of ice sheets accumulating so much mass they become unstable, as postulated for Heinrich events, or an oscillation in deep ocean currents (Maslin et al.. 2001, p25).
These events have been attributed to changes in the size of the ice sheets[13] and atmospheric carbon dioxide.[14] The former determines the strength of the Atlantic Ocean circulation via altering the northern hemisphere westerly winds, gulf stream, and sea-ice systems. The latter modulates atmospheric inter-basin freshwater transport across Central America, which changes the freshwater budget in the North Atlantic and thus the circulation. These studies corroborate the previously suggested existence of a "D-O window"[15] of AMOC bistability ('sweet spot' for abrupt climate changes) associated with ice volume and atmospheric CO2, accounting for the occurrences of D-O type events under intermediate glacial conditions in the late Pleistocene.
Dansgaard–Oeschger event - Wikipedia
Yep. Changes in ocean currents. Shouldn't be a surprise to anyone.View attachment 981096
Suggestions of solar and oceanic causes have been made, but no clear proof is yet available. In addition, some studies suggest that D-O events may be triggered by complex interactions between the atmosphere, the polar ice pack, and the oceans that affect how heat energy is transported toward the poles.May 31, 2024
Dansgaard-Oeschger event | Definition, Causes, & Facts
View attachment 981097
Britannica
https://www.britannica.com › ... › Earth Sciences
What caused Heinrich and Dansgaard–Oeschger events? The cause of these glacial events is still under debate. During the last glacial time, large ice sheets rimmed the North Atlantic. At certain times, these ice sheets released large amounts of freshwater into the North Atlantic. Heinrich events are an extreme example of this, when the Laurentide ice sheet disgorged excessively large amounts of freshwater into the Labrador Sea in the form of icebergs. Scientists have hypothesized that these freshwater dumps reduced ocean salinity enough to slow deepwater formation and the thermohaline circulation. Since the thermohaline circulation plays an important role in transporting heat northward, a slowdown would cause the North Atlantic to cool. Later, as the addition of freshwater decreased, ocean salinity and deepwater formation increased and climate conditions recovered. Evidence for changes in deepwater formation supports the freshwater forcing hypothesis. Measurements from deep-sea sediments in the North Atlantic indicate reduction of deepwater formation during Heinrich events (McManus et al. 2004). Evidence for freshwater forcing and reduced deepwater formation during D-O events is more ambiguous. The initial trigger for freshwater releases has not yet been identified. One suggestion is that small, gradual changes in solar output could have influenced the timing of abrupt changes. Other ideas call upon natural oscillations of the ice sheets themselves or of ocean processes.
Causes
The processes behind the timing and amplitude of these events (as recorded in ice cores) are still unclear. The pattern in the Southern Hemisphere is different, with slow warming and much smaller temperature fluctuations. Indeed, the Vostok ice core was drilled before the Greenland cores, and the existence of Dansgaard–Oeschger events was not widely recognised until the Greenland (GRIP/GISP2) cores were done; after which there was some reexamination of the Vostok core to see if these events had somehow been "missed".[citation needed]
A closeup near 40 kyr BP, showing reproducibility between cores
The events appear to reflect changes in the North Atlantic Ocean circulation, perhaps triggered by an influx of fresh water[8] or rain.[12]
The events may be caused by an amplification of solar forcings, or by a cause internal to the earth system – either a "binge-purge" cycle of ice sheets accumulating so much mass they become unstable, as postulated for Heinrich events, or an oscillation in deep ocean currents (Maslin et al.. 2001, p25).
These events have been attributed to changes in the size of the ice sheets[13] and atmospheric carbon dioxide.[14] The former determines the strength of the Atlantic Ocean circulation via altering the northern hemisphere westerly winds, gulf stream, and sea-ice systems. The latter modulates atmospheric inter-basin freshwater transport across Central America, which changes the freshwater budget in the North Atlantic and thus the circulation. These studies corroborate the previously suggested existence of a "D-O window"[15] of AMOC bistability ('sweet spot' for abrupt climate changes) associated with ice volume and atmospheric CO2, accounting for the occurrences of D-O type events under intermediate glacial conditions in the late Pleistocene.
Dansgaard–Oeschger event - Wikipedia
en.wikipedia.org
The majority of heat from the sun is stored in the ocean.
The ocean is warming up naturally because of the sun.
The NH is still thawing from the last glacial phase.
The combination of the sun heating the ocean and the NH thawing from the last glacial period is the primary reason the earth is warming.
CO2 has only added 0.22C to 0.5C of the warming since the industrial revolution.
I just did.
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