Posted on 11/15/2022 5:38:17 PM PST by vrwc1
Maybe the Earth is getting warmer. Wind Power, Electric Vehicles and solar panels won’t solve anything.
Since the dawn of time Humans acting individually have relocated, developed new crops and adjusted or found solutions. We don’t want big government or worse the United Nations telling us what to do.
I’m not surprised.
Simple question. What’s the correct temperature of the planet supposed to be?
There is NO science proving that human activity causes any climate changes. We couldn't if we tried. We must simply adapt to what God's nature sends us.
Odd, in the late 1960’s, I attended Kate Collins Junior High School in Waynesboro, Virginia.
“Never mind basic facts, I’m trying to make a point.”
Reminds me of the climate-change crowd.
Liberals are fond of using the term “denier” to smear people. Let’s turn it around. Mayorkas and Harriss are “border deniers”. Biden is an “inflation denier”. They are all “crime deniers” e.g. Lightfoot and Adams. They are all “gender deniers”, they pretend there are more than 2 genders. They are “fraud deniers” because they won’t admit there is fraud in elections. They are “death deniers” because they don’t admit that abortion causes a human to die....
BTTT!!!!
I like it.
Simple question. What’s the correct temperature of the planet supposed to be?
Good question. I worked with the International Satellite Cloud Climatology Project (ISCCP) in 1989. The annual average temperature of the Earth in 1989 was ~60°F (15°C). The satellite derived average annual temperature has been the same ever since but NOAA would never publicly release this product.
Cooling oceans caused the ice ages.
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Interesting idea, kinda like warming caused a rise in CO2 (released from the warmer oceans). Do you have a reference for this process? I can add that to my list of causes. Over the past one million years the Earth has experienced several ice ages (Pleistocene Epoch), each ~100,000 years in length and separated by a short interglacial period lasting 15-20 thousand years. The last interglacial period (Eemian) ended 115,000 years ago.
There are many possible triggers for the onset of an ice age including Milankovitch cycles, asteroid impacts and increased volcanic activity. Changes in ocean and atmosphere circulation patterns are certainly contributing factors.
Plate tectonics can change circulation pattens over time. 700 million years ago the super continent Rodinia stopped ocean circulation, preventing heat transfer from the equator to the poles. Glaciers expanded from the poles toward the equator until the entire planet was encased in ice, Snowball Earth. Global temperatures averaged -40 degrees.
There seems to be a pattern over 250 million years where the continents merge into a supercontinent and then break up again. After Rodinia there was Gondwana (550 million ybp) and Pangeae (250 million ybp).
Satellite imagery recently revealed a 300-mile wide impact crater in the Wilkes Land region of East Antarctica. This asteroid impact (250 million ybp) was more than twice as large as the Chicxulub crater that caused extinction of the dinosaurs 185 million years later. The Wilkes Land asteroid is estimated to have been 30 miles in diameter. Translational waves from the Antarctic impact propagated around the globe and focused at the anti-impact site, inducing an outbreak of volcanism over what is now called Siberia. This impact event 250 million ybp is known as the “Great Dying,” the Permian-Triassic extinction event. 90% of all life on earth was obliterated.
I’m thinking that an asteroid impact and subsequent increased volcanic activity may be the primary trigger for the onset of an ice age. Milankovitch cycles and changes in ocean and atmosphere circulation patterns can lead the planet out of an ice age but the initiation of ice age onset could be triggered by a catastrophic event. I don’t think that changes in CO2 has much to with the process at all.
Addendum: The current interglacial period (Holocene) began in earnest about 11,000 years ago but glaciers began melting 20,000 years ago. Over this melting period, global sea levels rose 120 meters. Atmospheric CO2 increased as well because of outgassing from the oceans but lagged behind the global rise in temperatures. Oceans are tremendous CO2 sinks and slowly release their reserves after a period of sustained warming.
There was a cool period that began 12,800 years ago (Younger Dryas) and lasted 1,300 years, likely the result of a comet that broke-up over Europe and Canada, raining down fragments and cooling the Earth. But warming returned about 10,700 years ago. Temperatures rose 20°F (11°C) over a period of just several years. Rapid spikes in global temperatures have occurred two dozen times over the last 100,000 years.
She is a propagandist.
I’m thinking that an asteroid impact and subsequent increased volcanic activity may be the primary trigger for the onset of an ice age. Milankovitch cycles and changes in ocean and atmosphere circulation patterns can lead the planet out of an ice age but the initiation of ice age onset could be triggered by a catastrophic event. I don’t think that changes in CO2 has much to with the process at all.
Yes, CO2 follows temperature so it can't lead anything. It can help amplify warming or cooling but it's not the primary driver. The M-cycles can cause glaciation and glacial retreat. That assumes we are in an ice age because the M-cycles aren't strong enough to change the planetary temperature much. Instead what they do is create an imbalance in one hemisphere.
Why was Greenland much warmer with a lot less ice in the last interglacial? It's actually pretty simple, the earth was closest to the sun in summer. Right now the earth is closest to the sun in winter. So right now Greenland won't melt substantially like it did in the Eemian. That's pure M-cycle, doesn't change the earth's temperature much but the sea levels were about 5-6 m higher than present.
M-cycles can also affect the southern hemisphere and kick off glaciation. One theory is that the icing over of the southern ocean kicks off glaciation. In any case the "tempo" of glacial cycles is governed by M-cycles which control ice, see https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1002/2016GL071307. If that link doesn't work try clicking through https://scholar.google.com/scholar?cluster=16039226567289430571&hl=en&as_sdt=0,47
Meanwhile the long term ice age itself comes from geography, not just supercontinents as you pointed out, but much more recent and seemingly subtle geographic changes. Paper https://hal.archives-ouvertes.fr/hal-00413525/document shows and explains why the Drake passage makes us super chilled right now (other than the ancient snowfall earth anomaly that you pointed out).
Another very recent event was the closing of the ithsmus of Panama https://oceanrep.geomar.de/7208/1/703_Haug_2004_HowTheIsthmusOfPanama_Artzeit_pubid12139.pdf which "put ice in the Arctic".
In short the temperature of the planet is mostly set by geography. M-cycles can override that regionally and they can certainly trigger a glaciation (what you called ice age). They can also end the glaciation or trigger some unusual regional warmth (e.g. the Greenland Eemian).
Why was Greenland much warmer with a lot less ice in the last interglacial? It’s actually pretty simple, the earth was closest to the sun in summer. Right now the earth is closest to the sun in winter. So right now Greenland won’t melt substantially like it did in the Eemian. That’s pure M-cycle, doesn’t change the earth’s temperature much but the sea levels were about 5-6 m higher than present.
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Thank you for addressing my speculations. So M-cycles can amplify warming or assist in cooling. I’ll follow up on Greenland melting during the Eemian interglacial. The earth being closest to the sun in the summer causes more heating in the Northern Hemisphere, where there is more land than in the Southern Hemisphere. I can see how Greenland would experience significant melting compared with the current earth-sun configuration. Thanks for the references, I’ll check them out.
A doubling of CO2 would at most induce warming of 1°C based on laboratory tests. But climate sensitivity to CO2 seems much lower than the 3°C assumed by the climate models (amplification from H2O has not been observed in the atmosphere). Negative feedback from clouds, aerosols, volcanism and cosmic rays may provide a counterbalance to any warming from CO2.
If climate sensitivity to CO2 doubling was as high as they claim, the earth would have suffered from a runaway greenhouse effect a long time ago. The fact that we are still here bears witness to the long-term stability of our climate system. The risk of another ice age is a much greater existential threat than the catastrophic global warming predicted by the so called climate change community.
Happy Thanksgiving to all FRiends.
Start with THE big lie, and it's all downhill from there.
In your first reference “Hemispheric sea ice distribution sets the glacial tempo”, Geophysical Research Letters, [Shackleton, 2000] is cited,
“Temperature differences arising from atmospheric CO2 changes and energy loss will propagate globally, amplifying the cooling and leading to the growth of glaciers and the onset of an ice age” [Shackleton, 2000].
But ice core samples show that during periods of glaciation, atmospheric CO2 decreased by 64% and methane decreased by 50%. [1] It is clear that the glaciations were driving the changes in CO2 and CH4. Green House Gas (GHG) concentrations decrease in response to cooling in the oceans and increase with subsequent ocean warming. To suggest otherwise is incorrect.
1. Physics Today 73, 5, 48 (2020); https://doi.org/10.1063/PT.3.4474 (a good read)
“Greenland and Antarctic ice sheets show low GHG concentrations during cold glacial periods and high concentrations during warm interglacial times. Carbon dioxide usually varies between 180 ppm and 280 ppm and methane from 350 ppb to 700 ppb.”
Correction: But ice core samples show that during periods of glaciation, atmospheric CO2 decreased by 36% and methane decreased by 50%.
We apologise for the fault in the subtitles. Those responsible have been sacked. Mynd you, møøse bites Kan be pretti nasti...
We apologise again for the fault in the subtitles. Those responsible for sacking the people who have just been sacked have been sacked.
Well, we do the nose, and the hat, but she’s a witch. Turned out she was, “it’s a fair cop.”
We did do the nose, and the hat, but she’s a witch. All typos are intentional, for copyright purposes. What else floats beside witches? More witches? Very small rocks!? A duck! Who are you, who is so wise in the ways of science? It’s a fair cop.
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