UN says 1st of decade of century shows accelerated warming with more climate extremes

Jul 3, 2013 | Posted by: roboblogger | Full story: Canada.com

In this Dec. 30, 2010 file photo a wallaby stands on a large round hay bail trapped by rising flood waters outside the town of Dalby in Queensland, Australia.

Comments
1 - 18 of 18 Comments Last updated Jul 10, 2013

“Geologist [I'm Climate Change]”

Since: Mar 07

Nuneaton

#1 Jul 3, 2013
Interesting article.

A case of about time too.

As far as it goes, it is now a mite too warm to run the earth in the jason model climate (mode#2).

As a result the last decase has been marked by on/off switches between mode#2 and mode#3(which is about 2 degrees c more efficient @ cooling the planet).

The problem is that the Earth is not yet warm enough to stay in climate mode#3 so as a result the weather tacked onto the climate goes out of kilter in BOTH temperature extremes and BOTH rainfall extremes.

Good news is that the oceans & their huge heatsink continue to warm steadily so as a result the heatsink enables the increasingly longer term outbreaks of climate mode#3. Currently we remain on a warming trend as a result of the impending solar max, so the relatively more even weather of climate mode#3 happens more often.

Mode#3 is not good for farmers as the monsoonal flows are not fixed & instead track E. In classic mode#2 monsoonal areas such as India it results in a pulsating monsoon with high and low precipitation rates rather than a steady front trackable and predictable.
Mode#3 is however good for semi desert dwellers as it results in monsoonally fed squall lines & flashfloods which waters random areas enabling a "green desert" situation (watch out for the locusts).

The real bad news is that mode#3 appears right @ the end of interglacial warm spells and tends to switch off the thermohaline circulation driving the Gulf stream into the arctic ocean via Spitzbergen. Once the Gulf stream switches OFF & goes to NW.Africa for a Holiday, the next El nino event triggers climate mode#4 which re grows the laurentide ice cap over a period of a few millennia.

Have a nice day: Ag
SpaceBlues

Houston, TX

#2 Jul 3, 2013
Adrian Godsafe MSc wrote:
Interesting article.
A case of about time too.
As far as it goes, it is now a mite too warm to run the earth in the jason model climate (mode#2).
As a result the last decase has been marked by on/off switches between mode#2 and mode#3(which is about 2 degrees c more efficient @ cooling the planet).
The problem is that the Earth is not yet warm enough to stay in climate mode#3 so as a result the weather tacked onto the climate goes out of kilter in BOTH temperature extremes and BOTH rainfall extremes.
Good news is that the oceans & their huge heatsink continue to warm steadily so as a result the heatsink enables the increasingly longer term outbreaks of climate mode#3. Currently we remain on a warming trend as a result of the impending solar max, so the relatively more even weather of climate mode#3 happens more often.
Mode#3 is not good for farmers as the monsoonal flows are not fixed & instead track E. In classic mode#2 monsoonal areas such as India it results in a pulsating monsoon with high and low precipitation rates rather than a steady front trackable and predictable.
Mode#3 is however good for semi desert dwellers as it results in monsoonally fed squall lines & flashfloods which waters random areas enabling a "green desert" situation (watch out for the locusts).
The real bad news is that mode#3 appears right @ the end of interglacial warm spells and tends to switch off the thermohaline circulation driving the Gulf stream into the arctic ocean via Spitzbergen. Once the Gulf stream switches OFF & goes to NW.Africa for a Holiday, the next El nino event triggers climate mode#4 which re grows the laurentide ice cap over a period of a few millennia.
Have a nice day: Ag
What's your point precisely?

I doubt highly that you are trying to contradict the the PhD's in climate science. Whatever you are saying is of no consequence anyway.
June

Toronto, Canada

#3 Jul 4, 2013

“Tilt my hat at the sun”

Since: Jun 12

And the shadows they burn dark

#4 Jul 4, 2013
Of course the UN would sprout garbage like that.
What better way to convince the sheeple to give them more money than creating a disaster.
Fun Facts

Las Cruces, NM

#6 Jul 5, 2013
"On the one hand, as scientists we are ethically bound to the scientific method. On the other hand, we are not just scientists but human beings as well. To do that we need to get some broad based support, to capture the publicís imagination. That, of course, means getting loads of media coverage. So we have to offer up scary scenarios, make simplified, dramatic statements, and make little mention of any doubts we might have. Each of us has to decide what the right balance is between being effective and being honest."

Dr Stephen Schneider, of Stanford University

“Geologist [I'm Climate Change]”

Since: Mar 07

Nuneaton

#7 Jul 8, 2013
SpaceBlues wrote:
<quoted text>What's your point precisely?
I doubt highly that you are trying to contradict the the PhD's in climate science. Whatever you are saying is of no consequence anyway.
Simply put: The Jason model that all the AGW Brouhaha erupted over is now failing as it is no longer in operation for an increasing amount of the time.
Now isn't that an inconvenient truth.

The modellers are going to have to run a climate model from a timescale longer than 4000BC which was the strict limit enforced by the theocrats governing the climatology PhD awarding bodies during the Bush & Cheney Hegemony.

As a matter of fact the current Jason model that the UN works to was only modelled using weather station reports for the bulk of the last century,(and a few historic docs in western renaissance hotspots prior to the last century). As such the Jason model did not even follow the effects of oceanic warming during the time that climate mode#2 (the Jason model descriptive) was actually in operation.

A look back at palaeoclimate reportage for ancient world civilisations shows some interesting changes as the oceans warmed, one of which was the drying of the Sahara for example.

The point was that the model in use was too limited as it did not take in past data and model climate as a result.

Run one model using Brute force and you will get changes if it is robust enough.

Run the timescale over several glacial-interglacial cycles and 4 distinct circulation pattern models, each with individual efficiencies of cooling become apparent, ALL of which last long enough to leave a fossil record.

Tell the climate modellers to "get some rocks".

Have a nice day: Ag
SpaceBlues

Houston, TX

#9 Jul 8, 2013
Adrian Godsafe MSc wrote:
<quoted text>
Simply put: The Jason model that all the AGW Brouhaha erupted over is now failing as it is no longer in operation for an increasing amount of the time.
Now isn't that an inconvenient truth.
The modellers are going to have to run a climate model from a timescale longer than 4000BC which was the strict limit enforced by the theocrats governing the climatology PhD awarding bodies during the Bush & Cheney Hegemony.
As a matter of fact the current Jason model that the UN works to was only modelled using weather station reports for the bulk of the last century,(and a few historic docs in western renaissance hotspots prior to the last century). As such the Jason model did not even follow the effects of oceanic warming during the time that climate mode#2 (the Jason model descriptive) was actually in operation.
A look back at palaeoclimate reportage for ancient world civilisations shows some interesting changes as the oceans warmed, one of which was the drying of the Sahara for example.
The point was that the model in use was too limited as it did not take in past data and model climate as a result.
Run one model using Brute force and you will get changes if it is robust enough.
Run the timescale over several glacial-interglacial cycles and 4 distinct circulation pattern models, each with individual efficiencies of cooling become apparent, ALL of which last long enough to leave a fossil record.
Tell the climate modellers to "get some rocks".
Have a nice day: Ag
You, too.

I don't have any problem with all that. It is called the march of progress. Limits are exposed to wring dry a particular approach, etc.

Climate modellers do talk with and listen to those who "get some rocks."

All the while man-made emissions are increasing .. thus making our future smoky .. murky .. muddy .. ugly .. hot.
SpaceBlues

Houston, TX

#10 Jul 8, 2013
Anglo-Saxon-Celt wrote:
<quoted text>
In other words "what can we get away with?"
WRONG.

That is your own technique which was taught by your parents.
LessHypeMoreFact

Toronto, Canada

#11 Jul 8, 2013
SpaceBlues wrote:
<quoted text>What's your point precisely?
I doubt highly that you are trying to contradict the the PhD's in climate science. Whatever you are saying is of no consequence anyway.
I've asked him to reference the 'climate modes' in some climate publication and he avoided it. I have no doubt that he is a climate scientist or modeller but his claims do not (as far as I can tell) come under 'established science'.

Somewhat less than convincing without source in the science journals referenced.
Fun Facts

Las Cruces, NM

#12 Jul 8, 2013
Anglo-Saxon-Celt wrote:
<quoted text>
In other words "what can we get away with?"
Exactly
Fun Facts

Las Cruces, NM

#13 Jul 8, 2013
"UN says 1st of decade of century shows accelerated warming with more climate extremes"

No, not really.

Our last 10 years as compared with the prior ten years. Repeated for each decade back to 1902.

.14*C warmer

http://data.giss.nasa.gov/cgi-bin/gistemp/nma...

.15*C warmer

http://data.giss.nasa.gov/cgi-bin/gistemp/nma...

.18*C warmer

http://data.giss.nasa.gov/cgi-bin/gistemp/nma...

.15*C warmer
http://data.giss.nasa.gov/cgi-bin/gistemp/nma...

.12*C warmer

http://data.giss.nasa.gov/cgi-bin/gistemp/nma...

'63 as compared to '53 cooler by .01*C

http://data.giss.nasa.gov/cgi-bin/gistemp/nma...

.02*C warmer
http://data.giss.nasa.gov/cgi-bin/gistemp/nma...

.02*C cooler
http://data.giss.nasa.gov/cgi-bin/gistemp/nma...

.15*C warmer
http://data.giss.nasa.gov/cgi-bin/gistemp/nma...

.11*C warmer
http://data.giss.nasa.gov/cgi-bin/gistemp/nma...

.11*C warmer
http://data.giss.nasa.gov/cgi-bin/gistemp/nma...

The most recent ten year period is .14^C warmer than the previous ten year period.

Four ten year periods had a greater increase in temperatures than the last ten year period.
SpaceBlues

Houston, TX

#14 Jul 8, 2013
Hey ff, submit your beef to a science journal. Other posters like myself don't have the time or interest to play games with you.

“Geologist [I'm Climate Change]”

Since: Mar 07

Nuneaton

#15 Jul 10, 2013
SpaceBlues wrote:
<quoted text>You, too.
I don't have any problem with all that. It is called the march of progress. Limits are exposed to wring dry a particular approach, etc.
Climate modellers do talk with and listen to those who "get some rocks."
All the while man-made emissions are increasing .. thus making our future smoky .. murky .. muddy .. ugly .. hot.
Remember that we are in an interglacial interval. There have been lots of them during the Pleistocene which in the ~2.4 Million years of operation has had either 24 or 26 glacial periods depending on whom actually published the data from marine cores.

The prior interglacial periods were all also marked by global warming and ALL had the same conditions during the closing stages as we have right about now (with your descriptions of summer weather tacked on).

The addition of more warming influence merely makes the initially cold ocean warm faster bringing the interglacial closing stage forward in time,(ie. shortening the length of the interglacial period).

Our current interglacial was ALREADY warmer than the prior interglacial which was heavily influenced in NW Europe by the influence of the Gulf stream. This warming was in fact due to the CO2 output from the Toba supervolcano (74000Bp), which having erupted a sum total of ~7000Km3 of rhyolite (most of which is ponded as densely welded tuff in the caldera, with ~2800Km3 in the outflow sheet); which altered the partial pressure of the atmosphere as a result of exsolved magmatic gas. Glacial conditions were cold post Toba as a result of the response to the SO2 transient which approximately doubled the size of the Laurentide ice cap, leaving the plains of NE.Canada and central Alaska ice free and everything close to the E.coast Canada covered complete with "snowbergs filling the arctic ocean until ~30,000Bp.

One would therefore expect that the current warm conditions @ the end of the current interglacial will not last for particularly long. and the outcome long term is in fact the exact opposite of the AGW Brouhaha,(Ain't that a bitch).

Once the rocks are got by the climatologists the missing bits should be tacked on, until then the politicians and theologians will continue to run the population around like terrified sheep hoping for some dropped money, or a handy accident victim to pick clean.

Have a nice day: Ag

“Geologist [I'm Climate Change]”

Since: Mar 07

Nuneaton

#16 Jul 10, 2013
LessHypeMoreFact wrote:
<quoted text>
I've asked him to reference the 'climate modes' in some climate publication and he avoided it. I have no doubt that he is a climate scientist or modeller but his claims do not (as far as I can tell) come under 'established science'.
Somewhat less than convincing without source in the science journals referenced.
These taken from reports of vegetation patterns and faunal habitats throughout the pleistocene and matching to published times and conditions @ the time. The modes are NOT published in climatology journals as a result of the lack of summing up by palaeoclimatologists OR a direct block preventing such a summation as a result of the implications for current real time climate models.

Climate mode#1

This is the default mode for the cold climate typical of glacial periods when all the excess heat has been drawn out of the ocean.

It is characterised by "Belt weather" with a fit due to geometry according to the radius of the planet. There is a central descending high pressure band over the equator. This is then succeeded by a tropical rainbelt fixed at a latitude approx. 5-10 degrees or so N, & S. of the equator resulting in 2 jungles which cannot meet as a result of dry savannah between them. This is what has separated the Chimps (N.) from the Bonobos (S.) in Africa. which continue not to meet as a result of the intervening Congo river @ present.

Above this tropical rainbelt is another savannah which may be desert (as in Australia) which has preserved its Pleistocene landscape in N.Central Australia into the Holocene.

Above this is another rainbelt (Temperate) which covers a latitude similar to the N. Sahara, and is likely to have reached S.Australia and S.Africa. On the N.part of this rainbelt conditions are cold enough for snow with the result being development of local ice caps such as Patagonia on high ground crossing the rainbelt.

Above this is a polar hood characterised by cold descending air which sweeps out in a katabatic flow into the N. part of the temperate rainbelt. Precipitation here is very low and is usually spindriff blown in by wind during winter. Vegetation in this zone is the classical "Mammoth steppe" which covered a wide belt of Eurasia stretching from E.Ireland through to Kamchatka and Beringia linking up with Alaska & E.Canada.

This mode is VERY inefficient @ cooling the planet. Practically unbroken sunlight on the equator & a very limited seasonal drift of the rainbelts results in very steep equatorial heating, particularly of ocean waters. The temperatures in the equatorial zone as a result of the inefficiency are relatively warm with the result that Jungle in glacial conditions resembles jungle in our current climate.
Conversely as a result of very inefficient atmospheric heat transport, polar regions refrigerate, with extensive frosts and a very reduced precipitation rate reminiscent of modern Antarctica which may cause ablation of ice caps by wind erosion & sublimation such as in the "dry valleys region of Antarctica @ present.

As a default cold period climate mode, this one naturally shows up following major cooling events in the Glacial periods.

End description Mode#1 Ag

“Geologist [I'm Climate Change]”

Since: Mar 07

Nuneaton

#17 Jul 10, 2013
Mode#2

This is the classical mode that has been characterised in the Reagan Era by Jason (whom I actually believed was a climate modeller in person for many years).

This mode is characterised by fixed monsoonal roots in longitude, where monsoonal flows carrying warm tropical air head for the poles on E directed equator to pole flows in a /(N.) or \(S.) vector depending on which hemisphere they operate in.

The bulk of monsoonal flows are relatively weak and terminate in the temperate rainbelt. There are however 2 very strong monsoonal flows which terminate in the polar regions, these being the "Gulf stream" monsoonal flow (E.Caribbean-Spitzbergen) following the equator-pole thermohaline driven gulf stream, and the "Coral sea" monsoon in the south, extending from the region of Vanuatu through to Patagonia & the Antarctic peninsula. Both of these strong monsoonal flows feed ice caps (Greenland & Patagonia).

The mode is also characterised by a linking of the monsoonal roots with as a result, a single tropical rainbelt, the mode#1 equatorial savannah becomes history once the earth warms enough to link the monsoonal roots. The tropical rainbelt ALSO shifts in latitude, with a rainy season N. & S. of the equator as a result of the drift and also seasonal directionality of the weaker monsoonal flows (where the name came from). The temperate rainbelt also drifts N & S, as a result of seasonality (largely absent from mode#1). This seasonality drift is enhanced by global temperatures with the result being an increase in latitude of the temperate rainbelt with increasing warming which added significantly to the drying of the Sahara & S.Australasian desert belts.

The polar regions in mode#2 are similar to mode#1 with the addition of monsoonal influence & also frontal weather from the temperate rainbelt. The Boreal forest therefore extends into the former mammoth steppe and is limited by the frost line in winter, & the summer growth season length.

This should seem familiar to anyone older than 30 years of age is it adequately describes the climate in their schooldays.

Weather variability in this mode is both latitudinal and longitudinal particularly via easterly wave thunderstorms in the tropical rainbelt, which produces enhanced rainfall in monsoonal root areas and local drying in the linkage areas (such as the E.African famines of the 80s & 90s).

The limiting factor for operation of this mode is global temperature as it eventually cannot run above a certain temperature due to instability affecting the strong monsoons. Above this limiting global temperature the strong monsoonal flows weaken and the mode switches to a more efficient circulation pattern. Mode#2 can only operate above the fixed limiting temperature as a result of continental geometry in which case the strong monsoonal flows will be dry and the rainfall from weak monsoons and the linking tropical waves will be on the opposite side of the planet to the strong monsoonal flows. This scenario happened during the Permian period immediately after the assembly of Pangaea which was a < shape perfect for the development of 2 strong dry monsoonal flows from equator-pole.

end description mode#2 Ag

“Geologist [I'm Climate Change]”

Since: Mar 07

Nuneaton

#18 Jul 10, 2013
mode#3

This is the default climate mode for a situation involving scattered continents and free connectivity between the oceans. In this mode unlike mode#2 the oceans direct the climate (in mode#2 the climate directive was continental).

This mode does NOT have fixed monsoonal roots, as there is no strong monsoonal flow in operation assisting in longitudinal fixing of monsoonal flows. In this mode the monsoonal flows are ephemeral and drawn from the tropical rainbelt which has lost a fair amount of its N-S seasonal drift. The monsoonal flows drift E with time drawing the bulk of the equatorial airflow with them. easterly wave thunderstorms tend to be drawn into the monsoonal flows (as also are tropical storms and cyclones) with as a result a relatively smooth coverage in the former desert belt N. of the tropical rainbelt. The tropical rainbelt also tends to dry out as a result of the failure of monsoonal root fixing so as a result a relatively dry forest subject to storm rainfall and irregular drought develops over the equator.

The desert belt characteristic of mode#2 becomes more watered as a result of the passage of E drifting monsoonal flows resulting in "squall line" flashfloods, and the coverage of wide areas by semi desert vegetation subject to a combination of flashflood, fires, and vegetarian insect plagues according to the rainfall events of the previous year.

The temperate rainbelt is considerably more balanced and better fed with no polar distortions produced by the strong monsoons of mode#2. The input of monsoonal flows can produce a low pressure cell in the rainbelt fed by a monsoonal flow(which drifts E with time); The developing low pressure cell drifts away from the feeding monsoonal flow with time and expands in size as expected. The problem @ ground level caused by this characteristic is the fact that the low pressure cell may stay fixed over one spot until it is bumped out of the way by another low pressure cell drifting E in the rainbelt. Such a low acts like a marble on a conveyor belt and may drop rainfall totals over one spot measured in centimetres rather than millimetres resulting in impressive flood totals.{There have been a few of these this year}.

The temperate rainbelt is capable of latitudinal drift with global temperature and when running "Hot" the rainbelt will drift to a latitude above the level of the arctic & Antarctic circle leaving only a lightly cloudy polar high pressure cell which may reach the diameter of a hurricane eye in really hot periods.

The fossil records of climate mode#3 show up as Artcic circle rainbelt forests in Greenland during the Palaeocene & Eocene featuring swamp cypress, dawn redwoods, Sequoia, Pseudolarix, Cedrus & Ginkgo; particularly during the eruption of the Thulean plateau large igneous province. These species are generally now semitropical or warm temperate, with only Larix evolving to boreal from Cedrus.

The main character of mode#3 is its generally smooth spread in longitude producing belted weather with general chaos in each belt as a result of the weather tacked on.

This mode does NOT last very long in the Pleistocene as a result of its shutdown of the strong monsoonal flows and its interference with the thermohaline boreal circulation in the N.Atlantic as a result of flood drainage from major temperate rainbearing low pressure cells debouching into the Arctic ocean plating over the surface with low density freshwater.
Outside of the Pleistocene it became the default climate mode from the time interval ~mid Triassic to at least Eocene in the Tertiary with probably no breaks in between times.

end description mode#3

“Geologist [I'm Climate Change]”

Since: Mar 07

Nuneaton

#19 Jul 10, 2013
mode#4

This is a sudden short duration very efficient cooling mode. It is the characteristic which produces the Laurentide ice cap in the Pleistocene and was probably also responsible for minor ice caps in Patagonia and S.Africa and definitely responsible for the inflated ice cap and outflow glacial shelf deposits of Antarctica, which effectively doubled its size during glacial intervals.

The mode is characterised by equator to pole loops driven by the "El Nino" hot pool backed up against the pan American barrier joining N. & S. America and separating the Pacific ocean from the Atlantic.

The master cell runs as a chain of low pressure cells from the El Nino hot pool through the Caribbean and up the E.Coast USA before arcing back through Greenland and N.Canada. The temperature differences between equator & arctic guarantee extensive precipitation in this belt, and maintained the Appalachian rainforest through the Pleistocene. The driving mode#4 cell then arcs the flow across the pole and returns it through Alaska as a cold dry flow extending from Alaska offshore of the N.American Pacific coast back into the El Nino hot pool. Precipitation on the N.American W. coast is driven by snow & hail showers in cool dry air over warm ocean. The central high pressure cell in the middle of the loop is fixed & is about the size of Australia.

This master cell precipitates a geometric fit of 3 cells (possibly 4) per hemisphere with mirror image results cycling air from equator to pole. The El Nino hot pool produces the master cell as it is BOTH hotter and moister than other roots for the mode#4 cells.

The very efficient cooling caused by cycling of air in a loop between equator & pole turns the bulk polar precipitation from rain to snow in a few centuries. The Laurentide ice cap fed by the El Nino hot pool, covering Greenland E. & Central Canada & the NE.USA grows to its max size in about 3 millennia, with a corresponding sea level drop as a result of the draw out of water and its dumping as snow. Other small ice caps fed by a cooler drier root also appear, but the laurentide ice cap is the one most easily recognised and is a characteristic of this mode in operation.

The good news for those whom like interglacial life, is that while it is warm enough NOW to operate during major El Nino events, it cannot run with the gulf stream in operation running from The Caribbean to Spitzbergen via the Thermohaline cold density current of wintertime as a result of its interference with the geometric fit of the mode#4 cell. The other feature that prevents its operation is the smooth temperature gradient of the gulf stream off the E. coast of the USA and Canada which causes the mode#4 cell to break up into a monsoonal flow in less than a week (handy).

The El Nino hot pool is the cause of the Laurentide ice cap which is the reason for the main glacial interval featuring only the laurentide ice cap in the temperate-arctic zone.

For mode#4 to operate at all, the gulf stream driven by the thermohaline current in the arctic must shut down & go the NW. Africa region for a holiday (it seems to prefer this spot long term).

Climate mode#4 in operation evens out the temperature between equator & pole as a result of direct transport of equatorial air into polar regions. The coldest part of the mode#4 cell is in the N. part of the return loop over Alaska. It can occasionally be cold enough here to freeze carcasses in minutes (such as the Blue boy Eurasian Bison carcass). This may also be the cause of the frozen Siberian mammoth carcasses with well preserved flesh. Once the heat is drawn completely out of the equatorial region oceans (low temperature limit unknown @ present), the climate mode defaults to the default mode#1 which runs until the equatorial ocean temperatures rise enough to trigger another phase of mode#4.

end description mode#4

“Geologist [I'm Climate Change]”

Since: Mar 07

Nuneaton

#20 Jul 10, 2013
That neat little set should do the biz. I would like to hear him complain about that one.

I have done this before, and the posts were hacked & removed at least TWICE prior to this time.

Note: the Major European ice caps such as Fennoscandia did NOT exist during the classical glacial periods. The last of the Fennoscandia ice caps began growth when the Thermohaline circulation switched ON ~30,000Bp when the last of the snowbergs cleared out of the arctic ocean allowing winter frosts to cause cold brine to sink. The switch on of the thermohaline circulation then restores the gulf stream from the E.Caribbean-Spitzbergen & any further operation of climate mode#4 is prevented from that time onward.

The Fennoscandia ice cap was formed from monsoonal flow during the coldest stage of mode#2, when the bulk of precipitation in Fennoscandia was snow rather than rain.

Conclusion: The interglacials star cold & are characterised by global warming throughout.

One other note:(More rocks).

Climate mode#4 has been in operation before.
It was previously active in the late Vendian (900-~650Ma). It was again a feature of a time when the oceans were captured into basins by continental landmasses and a pan equatorial land bridge. In the case of the late Vendian, 1 or 2 hot pools were in operation & the sun was younger & smaller with somewhat less insolation. The CO2 drawdown from pelagic "acritarch" algae was also a factor in the late Vendian. The time period featured at least 4 intervals where the oceans froze down to the equator leaving windows in ice ablation zones with prismatic crystals able to transmit light and preserve algae and also eventual Ediacaran filter feeding fauna. These global snowball Earth scenarios ended when the CO2 content of the atmosphere drove atmospheric temperatures up to the point where the equatorial oceans melted driving a runaway melt episode and carbonate precipitation from a then cooling "selzer ocean"

We do not have a global "snowball @ present due to there being only one land barrier, and also due to the sun being older and larger than it was in the late Vendian.

The current Pleistocene glacial-interglacial cycles are driven by geometry of the continents rather than the capture of the oceans into basins with multiple mode#4 cells driven by el Nino type hot pools. There is only one true barrier & only one el Nino hot pool hence only one mode#4 driven ice cap.

Have a nice day: Ag

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