Unprecedented Warming My Ass

[ding]

Fort Fun Indiana you want to keep going?

 

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It is found that the global salinity variations associated with the thermohaline circulation may have a tendency to make the circulation increasingly asymmetric with respect to the equator. As a consequence the salinity difference between the Pacific and the Atlantic Ocean may be slowly increasing. Such a process could have a time scale long enough to be comparable with the time span between major glaciations. A speculative glaciation cycle is proposed which involves the above mentioned property of the thermohaline circulation. In this cycle the role of a Northern Hemisphere glaciation is to bring excess freshwater from the Pacific to the Atlantic.

The thermohaline circulation and the control of ice ages

 

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Abrupt Changes in Ocean Circulation During the Last Glacial-to-Interglacial Transition​

The melting of the vast continental ice sheets, which began ~20,000 years ago due to gradual changes in the seasonal and spatial distribution of the Sun's energy (Broecker & Von Donk 1970), was interrupted by several abrupt cold climate events. The two largest deglacial events in the North Atlantic — known as Heinrich Stadial 1 and the Younger Dryas — occurred approximately 17,500–14,600 and 13,000–11,500 years ago respectively (Figure 6) (Heinrich 1988, Bond et al. 1992, Grootes et al. 1993).

Evidence from marine sediment cores suggests large changes in deep ocean circulation associated with these events. For example, relatively high CdW values in the deep North Atlantic require a reduced relative contribution of NADW to the deep Atlantic during both the Heinrich Stadial and the Younger Dryas (Figure 6a). Relatively low CdW values at ~ 750m in the Florida Strait, where nutrient-rich AAIW reaches today, imply that AAIW did not penetrate as far north during these events (Figure 6a). These simultaneous decreases in both NADW and AAIW link the northward flow of AAIW to variations in the southward flow of NADW during the deglaciation, consistent with the role of AAIW as a supplier of NADW (Came et al. 2008).

Deglacial deepwater evolution based on δ13C exhibits some similarities to the CdW records, but also some important differences (Figure 6b). Like CdW, the δ13C records suggest that both the contribution of NADW to the deep Atlantic and northward AAIW penetration decreased during the Heinrich Stadial. Although δ13C records suggest that the contribution of NADW to the deep Atlantic was reduced during the Younger Dryas, δ13C records do not provide clear evidence for an associated reduced northward penetration of AAIW. The AMOC recovery following the Heinrich Stadial weakening is recorded ~ 16,000 years ago in the intermediate-depth δ13C record and both CdW records, but ~1,000 years later in the deepwater δ13C record.

Other proxies, including Benthic-Planktic 14C records also suggest that the contribution of NADW to the deep Atlantic decreased during these events (e.g., Boyle & Keigiwn 1987, Thornalley et al. 2011, Lynch-Stieglitz et al. 2007, Robinson et al. 2005) whereas the response of AAIW during these events is more controversial (e.g., Pahnke et al. 2008). Resolving why differences occur between proxy records is necessary in order to fully understand the link between deep ocean circulation and climate.

The prevailing view of the Heinrich Stadial is that instabilities in the Northern Hemisphere ice sheets resulted in catastrophic iceberg discharges into the North Atlantic Ocean (Bond et al. 1992). These freshened and reduced the density of North Atlantic surface waters, significantly curtailing surface-to-deepwater transformation and reducing northward transport of heat to the region. Expanded sea ice may have amplified cooling in the North Atlantic region. Once warming began at the end of the events, quick northward displacement of sea ice may have triggered an abrupt end of the cold events (Dansgaard et al. 1989, Li et al. 2005).

It is generally believed that freshening of the surface North Atlantic also initiated the Younger Dryas cooling. Fresh water from ice sheets melting into the North Atlantic, perhaps by way of the Arctic Ocean (e.g., Murton et al. 2010), reduced surface-to-deepwater transformation, and the associated northward heat transport. Expanded sea ice and meltwater from iceberg discharge may also have sustained the event.

 

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As shown by the work of Dansgaard and his colleagues, climate oscillations of one or so millennia duration punctuate much of glacial section of the Greenland ice cores. These oscillations are characterized by 5°C air temperature changes, severalfold dust content changes and 50 ppm CO2 changes. Both the temperature and CO2 change are best explained by changes in the mode of operation of the ocean. In this paper we provide evidence which suggests that oscillations in surface water conditions of similar duration are present in the record from a deep sea core at 50°N. Based on this finding, we suggest that the Greenland climate changes are driven by oscillations in the salinity of the Atlantic Ocean which modulate the strength of the Atlantic's conveyor circulation.

 

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[1] The waters passing through the Florida Straits today reflect both the western portion of the wind-driven subtropical gyre and the northward flow of the upper waters which cross the equator, compensating North Atlantic Deep Water export as part of the large-scale Atlantic meridional overturning circulation. It has been postulated from various lines of evidence that the overturning circulation was weaker during the Younger Dryas cold event of the last deglaciation. We show here that the contrast in the oxygen isotopic composition of benthic foraminiferal tests across the Florida Current is reduced during the Younger Dryas. This most likely reflects a decrease in the density gradient across the channel and a decrease in the vertical shear of the Florida Current. This reduced shear is consistent with the postulated reduction in the Atlantic meridional overturning circulation. We find that the onset of this change in density structure and flow at the start of the Younger Dryas is very abrupt, occurring in less than 70 years.

 

[EMH]

In the past 10k, 20k, 50k, 1 million years


GREENLAND FROZE WHILE NORTH AMERICA THAWED


which completely DISPROVES the "glacials" BULLSHIT pushed by the Co2 FRAUD and Co2 FRAUD funded faux "skeptics" like ding.

 

[otto105]

https://www.cnn.com/2024/08/13/climate/us-cities-heating-up-fastest-dg/index.html

 

[ReinyDays]

Great dialogue between ding and votto ... SSDD EHM is why we can't have nice things ... what a dingbat ...

Can I be on ding's side here and still think votto makes great arguments? ... I don't know ... electrons are being wasted on folks like SSDD EHM, he'll never learn ... like a damn house cat ... sits on his dead ass threatening murder while licking his asshole ...

There also a lot of folks who aren't house cats, but smart enough to not post in these "minefield" threads ... so I agree with ding that we, who can, should be posting good science ... especially basic science ... most people reading here have never taken a college science class ... so I do think we should be explaining these matters at a level these fine honest folk can understand ... and then trust their humanity to carry on ...

I didn't say ding and votto were right ... [sniff] ... they're not, just they're not idiots ... or house cats ... it's only 1ºC warmer and that's nothing worth hacking up a hair ball over ...

 

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most people reading here have never taken a college science class ... so I do think we should be explaining these matters at a level these fine honest folk can understand ... and then trust their humanity to carry on ...

Roger that.

Warmer planet good.

Colder planet bad.

 

[otto105]

Roger that.

Warmer planet good.

Colder planet bad.

Wow, climate toddler is in the afternoon time slot.

 

[ding]

Wow, climate toddler is in the afternoon time slot.

CO2 is a weak GHG. The ocean is a heat engine for the polar regions. Remove that heat bad shit happens.

 

[otto105]

CO2 is a weak GHG. The ocean is a heat engine for the polar regions. Remove that heat bad shit happens.

Sure climate toddler.

And your proof is what, lord muckington?

 

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Sure climate toddler.

And your proof is what, lord muckington?

It is generally believed that freshening of the surface North Atlantic also initiated the Younger Dryas cooling. Fresh water from ice sheets melting into the North Atlantic, perhaps by way of the Arctic Ocean (e.g., Murton et al. 2010), reduced surface-to-deepwater transformation, and the associated northward heat transport. Expanded sea ice and meltwater from iceberg discharge may also have sustained the event.

 

[otto105]

It is generally believed that freshening of the surface North Atlantic also initiated the Younger Dryas cooling. Fresh water from ice sheets melting into the North Atlantic, perhaps by way of the Arctic Ocean (e.g., Murton et al. 2010), reduced surface-to-deepwater transformation, and the associated northward heat transport. Expanded sea ice and meltwater from iceberg discharge may also have sustained the event.

Doesn't prove shit about our current warming.

 

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Doesn't prove shit about our current warming.

"...the Eemian was punctuated by many short-lived cold events, as shown by variations in electrical conductivity (a proxy for windblown dust, with more dust indicating colder, more arid conditions) and stable oxygen isotopes (a proxy for air temperature) of the ice were used by these workers infer the climatic conditions during the Eemian. The cold events seemed to last a few thousand years, and the magnitude of cooling was similar to the difference between glacial and interglacial conditions; a very dramatic contrast in climate. Furthermore, the shifts between these warm and cold periods seemed to be extremely rapid, possibly occurring over a few decades or less...."

 

[otto105]

"...the Eemian was punctuated by many short-lived cold events, as shown by variations in electrical conductivity (a proxy for windblown dust, with more dust indicating colder, more arid conditions) and stable oxygen isotopes (a proxy for air temperature) of the ice were used by these workers infer the climatic conditions during the Eemian. The cold events seemed to last a few thousand years, and the magnitude of cooling was similar to the difference between glacial and interglacial conditions; a very dramatic contrast in climate. Furthermore, the shifts between these warm and cold periods seemed to be extremely rapid, possibly occurring over a few decades or less...."

Again, climate toddler explain how that informs us on our current rapid warming.

 

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Again, climate toddler explain how that informs us on our current rapid warming.

I just did, dummy. You were too dumb to notice. You really are ignorant.

 

[otto105]

I just did, dummy. You were too dumb to notice. You really are ignorant.

you didn't explain anything climate toddler. You just regurgitated something that you cut & pasted.

 

[ding]

you didn't explain anything climate toddler. You just regurgitated something that you cut & pasted.

Feel free to post some papers arguing the ocean can't cause abrupt climate change.

 

[ding]

you didn't explain anything climate toddler. You just regurgitated something that you cut & pasted.

You are out of your league. If you leave now I'll stop ass raping you.

Please do share the your peer reviewed scientific papers that say otherwise.


https://www.science.org/doi/10.1126/science.aaf5529?adobe_mc=MCMID=24445298415631476812898182430771639861|MCORGID=242B6472541199F70A4C98A6%40AdobeOrg|TS=1723213472

Sudden climate changes in the recent geological record

https://www.science.org/content/article/crippled-atlantic-currents-triggered-ice-age-climate-change

Collapse and rapid resumption of Atlantic meridional circulation linked to deglacial climate changes - Nature

Destabilisation of the Subpolar North Atlantic prior to the Little Ice Age - Nature Communications

Snapshots of mean ocean temperature over the last 700 000 years using noble gases in the EPICA Dome C ice core

https://www.sciencedirect.com/science/article/abs/pii/S0031018285800201

Deep Atlantic Circulation During the Last Glacial Maximum and Deglaciation​

https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/PA005i004p00469

https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2010PA0020