Climate Change Dries Up Huge Lakes, Melts Glaciers

[Weatherman2020]

Just 10,000 years ago this was a pristine glacier, now it's just a valley free of year round ice.

10,000 years ago this was the largest lake in California, now it is one of the driest and hottest place on earth.

This lake used to cover 3,000 sq miles 10,000 years ago, now it is just a series of valleys.

10,000 years ago this was a pristine ice field, now it is just a series of lakes.

Embrace change in climate.

 

[WillowTree]

My my!

 

[Weatherman2020]

You can see the evidence of what was once a pristine lake on the hillside. Now it's just a city with a university on what was the bottom of the lake 10,000 years ago.

 

[CrusaderFrank]

The Internal Combustion engine must be 14,000 years old.

What else can account for this rapid climate change?

 

[Weatherman2020]

What was once a very lovely glacier is now just ice free land inhabited by carbon polluters.

 

[Old Rocks]

Nice pictures. Now, what is your point?

 

[Weatherman2020]

Nice pictures. Now, what is your point?

Once again, the self evident flies unnoticed over your head.

 

[Old Rocks]

Are you, in your typically tortured way, trying to compare a climate change that took thousands of years to one that is occurring on the scale of decades and centuries?

 

[SSDD]

Nice pictures. Now, what is your point?

 

[Weatherman2020]

Are you, in your typically tortured way, trying to compare a climate change that took thousands of years to one that is occurring on the scale of decades and centuries?

Glacier Bay glacier receded 65 miles in 80 years.
In the 1800's.

The climate change I speak of also occurred in a very short time period.

 

[Billy_Bob]

The average inter-glacial cycle is between 9,000 and 16,000 years. Our current inter-glacial is a mere 14,650 years long at current.

Those glaciers have come and gone many times.. The "point" the alarmist morons are missing is quite literally the span of the inter-glacial cycle. (Sorry Old Fraud but your pointy head is what it went over..)

Maybe my use of crayons has helped you all understand seeing as you all think anything from the crayon kids as SKS is gospel...

 

[Old Rocks]

PERFECT STORM
We humans are threatened by a perfect storm as our population passes seven billion thanks to shortages of land, food and energy. Increased emissions of greenhouse gases are also reversing climatic changes that occurred over millions of years. The greenhouse-to-icehouse shift was caused by a succession of processes that took 49 million years, but mankind’s emission of greenhouse gases could reverse this process in just a few decades, changing the climate back to a greenhouse world with dizzying speed. Could Azolla help us combat man-made climate change and also provide local renewable food, livestock feed, biofertilizer and biofuel?

The Geological Society of London - The Arctic Azolla event

Thank you, Ding.

 

[Billy_Bob]

PERFECT STORM
We humans are threatened by a perfect storm as our population passes seven billion thanks to shortages of land, food and energy. Increased emissions of greenhouse gases are also reversing climatic changes that occurred over millions of years. The greenhouse-to-icehouse shift was caused by a succession of processes that took 49 million years, but mankind’s emission of greenhouse gases could reverse this process in just a few decades, changing the climate back to a greenhouse world with dizzying speed. Could Azolla help us combat man-made climate change and also provide local renewable food, livestock feed, biofertilizer and biofuel?

The Geological Society of London - The Arctic Azolla event

Thank you, Ding.

Your fantasy about going back to a hot house world is simply a fantasy. We will enter a glacial cycle long before we gain enough CO2 atmospherically to create the shift. Note the word "could" in the sentence and the fact that the paper then goes on to show other cycles within the system that would not allow it to happen.. You fixated on what you wanted to see and not on the science..

 

[SSDD]

PERFECT STORM
We humans are threatened by a perfect storm as our population passes seven billion thanks to shortages of land, food and energy. Increased emissions of greenhouse gases are also reversing climatic changes that occurred over millions of years. The greenhouse-to-icehouse shift was caused by a succession of processes that took 49 million years, but mankind’s emission of greenhouse gases could reverse this process in just a few decades, changing the climate back to a greenhouse world with dizzying speed. Could Azolla help us combat man-made climate change and also provide local renewable food, livestock feed, biofertilizer and biofuel?

The Geological Society of London - The Arctic Azolla event

Thank you, Ding.

Your fantasy about going back to a hot house world is simply a fantasy. We will enter a glacial cycle long before we gain enough CO2 atmospherically to create the shift. Note the word "could" in the sentence and the fact that the paper then goes on to show other cycles within the system that would not allow it to happen.. You fixated on what you wanted to see and not on the science..

You couldn't put enough CO2 in the atmosphere to cause the shift....the earth went into an ice age with atmospheric CO2 concentrations at about 4500ppm

 

[Old Rocks]

No, the Earth did not go into an Ice age with 4500 ppm in the atmosphere. Where the hell did you get that?

 

[Votto]

Well I can say with 100% certainty that all this talk about melting ice here in the artic is an absolute lie.

 

[Billy_Bob]

No, the Earth did not go into an Ice age with 4500 ppm in the atmosphere. Where the hell did you get that?

DO I really have to post this?

About 450 million years ago we glaciated and yes the levels of CO2 were well above 4,000ppm...

 

[Old Rocks]

The late Ordovician carbonate sedimentation as a major triggering factor of the Hirnantian glaciation
Enrique Villas, Emmanuelle Vennin, José Javier Álvaro, Wolfgang Hammann, Zarela A. Herrera, Eduardo L. Piovano
DOI: 10.2113/173.6.569 Published on November 2002, First Published on November 01, 2002


Abstract
A new approach explaining the main forcing factor of Hirnantian glaciation is proposed herein. It follows the models associating occurrences of continental glaciations with periods of low atmospheric CO2 levels. The accumulation of great volumes of carbonates during pre-Hirnantian late Ordovician, in regions where these deposits were previously absent, is suggested as a major sink of atmospheric CO2. This would have caused an important lowering of the average temperature in the early Hirnantian, after CO2values had attained a certain threshold. This process was maintained by other positive feedbacks, such as the short-term carbonate weathering CO2 sink. An increase of the direct flux of CO2 from the atmosphere to the oceans by means of dissolution would have been driven by the enhancement of carbonate deposition. The great inundation of the low latitude Laurentia craton during Cincinnatian times and the establishment of a temperate-water carbonate sedimentation on the North Gondwana margin during pre-Hirnantian Ashgill allowed the burying of more than 840 × 1015 kg (1.9 × 1019 mol) of dissolved CO2. This mass is equivalent to nearly 350 times the present values of atmospheric CO2. This is important enough to have greatly altered the equilibrium between the CO2 dissolved in the oceans and the partial pressure of CO2 in the air, eventually causing an important reduction of the latter. The new model also offers a simple explanation for the end of the glaciation after a short time-span. Glacioeustatic lowering of the sea level, concomitant with the glaciation, would have stopped the extra-sedimentation of carbonate due to the retreat of the oceans from the platforms, closing this CO2 sink. Pre-glacial CO2 levels would then recover, due to volcanic and metamorphic CO2 outgassing. After subsequent melting of the ice cap, oceanic circulation did not recover pre-Hirnantian Ashgill strength, resulting in a strong stratification of ocean waters and precluding the recovery of an extensive carbonate deposition. The well-known positive shift in the δ13C at the base of the Hirnantian is assumed to have been caused by weathering and dissolution of carbonates, relatively enriched in 13C, during the glacioeustatic regression and exposure of the platforms.

The late Ordovician carbonate sedimentation as a major triggering factor of the Hirnantian glaciation | Bulletin de la Société Géologique de France

One

 

[Old Rocks]

Polar front shift and atmospheric CO2 during the glacial maximum of the Early Paleozoic Icehouse

1. Thijs R. A. Vandenbrouckea,b,c,1,2,
2. Howard A. Armstronga,1,
3. Mark Williamsd,e,1,
4. Florentin Parisf,
5. Jan A. Zalasiewiczd,
6. Koen Sabbeg,
7. Jaak Nõlvakh,
8. Thomas J. Challandsa,i,
9. Jacques Verniersb, and
10. Thomas Servaisc

Abstract
Our new data address the paradox of Late Ordovician glaciation under supposedly high pCO2 (8 to 22× PAL: preindustrial atmospheric level). The paleobiogeographical distribution of chitinozoan (“mixed layer”) marine zooplankton biotopes for the Hirnantian glacial maximum (440 Ma) are reconstructed and compared to those from the Sandbian (460 Ma): They demonstrate a steeper latitudinal temperature gradient and an equatorwards shift of the Polar Front through time from 55°–70° S to ∼40° S. These changes are comparable to those during Pleistocene interglacial-glacial cycles. In comparison with the Pleistocene, we hypothesize a significant decline in mean global temperature from the Sandbian to Hirnantian, proportional with a fall in pCO2 from a modeled Sandbian level of ∼8× PAL to ∼5× PAL during the Hirnantian. Our data suggest that a compression of midlatitudinal biotopes and ecospace in response to the developing glaciation was a likely cause of the end-Ordovician mass extinction.

Polar front shift and atmospheric CO2 during the glacial maximum of the Early Paleozoic Icehouse

Two

 

[CrusaderFrank]

Nice pictures. Now, what is your point?

The climate changed