Milankovitch cycles: Natural causes of climate change
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- เผยแพร่เมื่อ 14 มิ.ย. 2020
- Explanation of natural causes of climate change, like Milankovitch cycles, volcanoes and sunspots.
Full text:
The average temperature on Earth has always fluctuated. Millions of years ago, for example, it was on average 8 degrees warmer on Earth. There were also ice ages thousands of years ago and the average temperature on earth was 2 degrees lower.
How did these temperature differences arise?
First, the sun plays a role. When the sun is more active, sunspots can be seen. This can make it a little warmer on Earth, but this only involves a tenth of a degree of heating. The current global warming can therefore not be explained by a change in the activity of the sun.
Volcanoes also play an important role. During a violent eruption, a lot of ash is released into the atmosphere. This ash, if it enters the atmosphere high enough, can remain in the atmosphere for a long time and block the sunlight. For example, the eruption in 1815 of the Indonesian volcano Tambora in 1816 caused the global temperature to drop sharply and 1816 was called the "year without summer."
Although in the short term the volcanoes cause a temperature decrease, volcanoes cause a temperature increase in the long term. Volcanoes emit the greenhouse gas CO2, which causes the temperature to rise. The earth was once a planet full of ice, but due to a lot of volcanic activity, a lot of CO2 was emitted and the temperature on earth slowly increased.
Milankovic's variables are a final natural influence. Milankovic thought that the temperature on earth was influenced by 3 variables related to the position of the earth relative to the sun. In short, the point is that if the northern hemisphere receives less energy from the sun in the summer, the ice on the North Pole will not melt and an ice age may arise.
First, the Earth does not orbit the sun in a circle, but in an ellipse shape, in which the sun is not centered. This is called eccentricity. The point where the Earth is closest to the sun is annually at the beginning of January.
So in July, the Earth is farthest from the Sun. This is summer in the Northern Hemisphere. Because of the distance, the earth receives less energy from the sun, the ice in the Northern Hemisphere melts less quickly.
This could be the beginning of an ice age.
If there is a circular shape, the Earth is closer to the sun at the beginning of July. This gives the Northern Hemisphere more energy, and the ice melts.
This prevents the formation of an ice age. The eccentricity changes approximately every 100,000 years.
The second is obliquity. This is the tilt of the earth's axis relative to the sun. The Earths axis has a tilt of 23.5 degrees, but this changes between 22 and 24.5 degrees. The wider the angle, the more the northern hemisphere turns toward the sun in summer and the more ice melts. The smaller the angle, the less ice melts in summer and the greater the chance of an ice age. The obliquity changes approximately every 41,000 years.
The third is the precession. This is a toll movement around the Earth's axis that changes every 26,000 years. Here the first two effects are amplified or limited depending on the eccentricity and obliquity.
Now that you have learned how natural fluctuations in the climate arise, we can investigate the consequences of climate change for the earth.
great video! loved the animations! congrats!
thanks for sharing
thank you for good representation
awesome video! Thank you!
GREAT VIDEO!!!
I think changes in the earths' magnetic field can also precipitate localized changes in climate. In recent years, there has been a large shift in the composite magnetic field. Since the magnetic field is responsible for holding the earths' atmosphere intact (due to protection from solar wind effects), has anyone looked at this as a factor?
"I think changes in the earths' magnetic field can also precipitate localized changes in climate". What you think is entirely irrelevant because you've never studied any of the topics related to this in the slightest and your comment informs that you have a negligible education in the physical sciences and are a worthless babbler of un-informative nothingness. I mean, apart from that great comment.
i would think gravity is holding the atmosphere intact.
As long we have magnetic field ,I don’t think it will change anything.
Yes. And it's a valid possibility
can we talk about the political and economic condition of the world
Remember the thermohaline currents.
1 milankovitch cycles.
2 sunspots.
3 thermohaline circulation.
And we are in a CO2 famine ... th-cam.com/video/RLnQo8l-BHc/w-d-xo.html
4. your mom
I would you suggest discussing the effects of perihelion and aphelion times when having a lower or greater eccentricity. The latter allows Earth to experience perihelion times, opposite to the former. I would think twice on when ice ages are more prone to happen. Thanks for the video.
Your comment is nonsensical.
@@grindupBaker explain why, please, thanks.
I'm not an expert. Sedimentary samples from sea bed and other
Stable sources all around the world, line up perfectly the ice age every 100,000 years theory
Awesome 😎
Very good but you miss some details when it comes to the suns effects on climate , like the solar winds which changes in relation to the solar cycles. A weaker sun = less solar winds allowing more cosmic rays to enter the planet , there is growing evidence that this effects cloud cover.
Yes, sun spot optimum and minimum 11 year cycles affect variations of solar radiations as well as changes in the Earth's magnetic field. Thank you for noting this further complexity, now maybe we can tax it.
Variations of solar irradiance also effects heat transport to the arctic, impacting climate change. Read: Solving the climate puzzle by Javier Vinos, in which Vinos explains his Winter gatekeepers hypothesis.
At what point in the cycle timelines, are we currently at? Can you clarify? Thank you
If you search there's a graph with all 3 cycles and the summer sunshine at 65N from it plotted on it. It's the summer sunshine at 65N that shows where we are. Easy to find that graph. It's a graph with 4 plots on it that you want.
Amazing visual representation and explanation!
May I suggest one correction, the precession cycles last 23ka and 19 ka (giving an average of 21.000 years) (Davis and Brewer, 2009) and not 26.000 as pointed in this video.
Its going to be a hard number to nail; we can see the climate record in ice easier which shows a planet freezing disaster cycle every 12k years and we are either due for one again or going through a cycle right now. The Venus and Jupiter tug (amplified by ALL of the gas giants pulling in the same direction this time) would have happened in Feb of 2021 and will only now start to become more and more noticable over the years.
no. you can't explain $hit.
Either number is way to large to have any significance in the current warming trend.
Planetary alignments are interesting for astronomers, fascinating for astrologers and completely irrelevant to the climate.@@Morristown337
Thank you!!!! You're my savior!!!!
lol
It's in all of us with which S/He speaks.
It could be also that all other planets in our solar system endure similar Milankovich cycles the exerts orbital & tilt variance of Earth, thus affecting its climates
Green house gas co2? But the plants and trees need co2..
Yes and if there are not enough plants to absorb it. It stays around.
@@SophiaAphrodite How much is enough? CO2 in our atmosphere has not changed since at the least the 1970s. 0.04% then and now.
I'm having a tilt at learning this.
The Milankovitch Cycles, Volcanoes. and Sunspots have always been the prevailing reasoning of climate change for myself. I'd appreciate seeing these factors compared to records on Paleoclimatology, the earliest documented observations of Sunspots, and documented global temperature. Be interesting to see if anything corresponds to global famines, cold snaps, and heatwaves outlined in historical text. The video is well presented.
Yes, on large time scales you are right. But don't fool yourself, the rapid climate change we are experiencing now is almost entirely man-made.
@@Zwerggoldhamster how so?..
According to guys like Freeman Dyson co2 is a good thing ( Le chatelier's principle) ..and the narrative of climate crisis is man made ......
See Patrick Moore PhD lectures. He is not paid by govt.
Applies common sense to science.
@@Zwerggoldhamster note that temperature and CO2 in atmosphere poorly correlate. Increase in CO2 is good for plants. Pollution is another issue. Man makes a flea's fart against a hurricane of difference in climate change.
@@frankmoore7292 What you say is simply wrong, there is no suger coating it. Temperature and CO2 do in fact correlate (look at the Keeling curve and compare it with temperature over the last 200 years). Plus, you can measure where CO2 comes from by looking at the isotope distribution (Carbon from fossil fuel has basically no C14 isotopes left), and this value corresponds to what one would expect given that we know more or less how much fossil fuel we are burning and how much CO2 we are therefore producing. Plus, the greenhouse effect is well understood in lab conditions, well observed on other planets and measured here on Earth.
Also, don't imply that this knowledge is dependant on the government. How probable is it that the meteorologists of *all* countries are being bribed? Look at the IPCC report. They only put something in there, if ALL UN-nations agree to put it in. That includes oil countries like Saudi Arabia.
I agree with you on minor points, tho: yes, pollution is a problem (actually cools the planet, but still not great to breathe in), and yes, there have been studies that show, that CO2 might help plants grow. That doesn't take away from what I wrote before and certainly doesn't mean that more CO2 is a good thing.
Your lecture is really good but we are from Asian part ,so it's is difficulty to understand your ancent so please use subtile that's y we can understand in better manner .
Thanks a lot for such wonderful video .
Keep it up .
Go to bottom of video screen, settings, then select language for subtitles. Also press captions to enable subtitles Can do for any video on YT 🙏
I still don’t understand how procession affects the weather
It's a simple explanation of the Milankovic Cycles, not a textbook on earth science.
Milankovitch cycles are clearly not the only cause, otherwise the cycles would have a regular pattern. The Younger Dryas glacial period followed the warming after the last stage 12,000 years ago and lasted 1500 years. It may have started within a period of less than 100 years and we don't know what the trigger was. Some model studies suggested that three cold summers, e.g. following a volcanic event with a lot of ash in the atmosphere, could trigger a return to glacial conditions. A warming climate is preferable to a cooling one!
Is it possible that all the gas giants pulling from the same direction is causing this too? (recently Venus and Jupiter did their thing too.) This is happening now and the past decade as far as planet alignment pull. It seems that geographic north this past equinox is more towards Russia/Europe putting North America more south. Instead of 23.5 its over 24 if I am not mistaken next season.
Do you know what the effect of Jupiters gravity on earth is? It is Zero. Or, rather, unmeasurably small.
Milankovitch cycles? Not the gas giants?@@Onequietvoice
@@Onequietvoicethe other planets like Jupiter are the cause for the Change in orbit of the Earth...
For my 10th birthday a volcano erupted. It was May 18, 1980. I had a horrible birthday cake. It was Disney's Cinderella. It's hot today for winter December weather.
What causes these cycles?
Tilt is just the way the 2 half-planets collided that made Earth & Moon. The collision gave Earth it's rotation and it's varying tilt & wobble. The orbit changes because Jupiter & Saturn relationships mostly. The Sun & all planets gravity pull on each other & this makes all their orbits gradually change and change back again. However, Jupiter & Saturn are hugely heavier than the other planets, with Sun being even many times as heavy as Jupiter. All planets orbit around the centre of all their combined gravity and that centre of gravity slowly moves around inside the Sun and just outside it.
a bunch of factors
More CO2, more trees. More trees more production of oxygen which will naturally result in the balancing of the O2/CO2 ratio again.
We are in a CO2 famine ...th-cam.com/video/ZB6KGUFbCkU/w-d-xo.html
doesn't work that way. especially since we are destroying them
@@oleonard7319 Exactly. So stop destroying trees. End of problem.
@@gordondwyer3641, not that simple we don't just need to stop doing it we would need to reverse everything we have done in the past 10ks going from 30% coverage to 57% coverage
@@oleonard7319 OH God no. Worst production I've ever seen. They need to get better actors.
Just one more time. Then i sill know it. 😢
wrong about Sun's forcing ability
hi there
Climate deniers in the comment section confusing past changes to climate with modern global warming.
If this was ancient times people wouls assume God is mad at us, but God is cause and effect. It has nothing to do with good or evil it just... is.
A more effective way of reducing global temperatures would be to alter the tilt of the earth's axis. If we can get everyone on earth to gather at a particular spot once a year we can change the tilt of the earth and thus reduce global warming.
Actually, a U.S. American Republican Senator asked the lady in charge for Forestry Services whether Forestry Services could arrange that and she said she'd need to check & get back to him on that. I'm not kidding ! This level of total idiocy is what we are up against, as you see in almost all the comments (except mine). Ain't life a hoot though ?
That is the best idea I have ever heard.
😂
hello
Hello
yo. think like an ice age, in millennia not like a koolaid drinker, in decades.
The proportions of the things that warmed Earth by 7.45 degrees from the last glaciation period (colloquial "ice age"), warming from 17,300 to 6,000 years ago is:
0.5 +- 1 w/m**2 8% Milankovitch cycles orbital eccentricity, axial tilt & precession of the
equinoxes changes forcing (what pulled the trigger that started it)
3.5 +- 1 w/m**2 53% ice sheets & vegetation changes albedo-change feedback
1.8 +- 0.3 w/m**2 27% CO2 change feedback
0.4 +- 0.1 w/m**2 6% CH4 change feedback
0.4 +- 0.1 w/m**2 6% N2O change feedback
:::::::::::::::::::::::::::::::::::::
6.6 +- 1.5 w/m**2 total
it sounds like co2 is a good thing it may prevent us going back into another ice age
Correct ... th-cam.com/video/DNeujL1IoCA/w-d-xo.html
It is meant to make people think that. It is not so.
Anyone here from MrBrady🌚
Sun spots are dark areas on the sun surface and less light coming to earth, this does not warm it more, it warms it less.
Wrong
These are areas where the light isn't held back by a EMF. They cause a phenomenon called coronal hole stream vastly increasing the speen and energy hitting our planet. Comprende hombre?
It does niether, at least not measurably, the only claim i have heard suggests a 0.1 deg warming.
Everything spot on except Wikipedia warning
Doesn't end with the fear mongering idiocy of a PBS lecture.
Correct ... th-cam.com/video/WtBT3M-RIZ0/w-d-xo.html
Awesome, so we can fill our atmosphere with co2, and not even worry about it
At last a geographer telling the truth which is that climate change is natural and expected
And more CO2 is good ... th-cam.com/video/zVRVopDdNyg/w-d-xo.html
until you realize that we re on the mylancovic cycle at the moment on this kinda side where it should get colder but it gets more warm.
@@momo1442 says who? Our EMF has weakened significantly over the last century. We might be facing a flip of our magnetic field which is going to cause mayhem.
@@de4ds1ghtcsgo94 Thats not a question about who says it but what you observe and we observe that we re right now in that direction of getting colder in this cycle.
@@momo1442 yes. This will happen when the EMF flips and our EMF is at full strength again
skabada
warning! this video aint woke!
One for the climate deniers
TH-cam and it’s “unbiased” wiki articles acting as the authority on this topic… That’s pretty rich 😅
Whenever I see the wiki disclaimers, I feel that it is safe to assume that whatever I'm about watch is going to be more factual than what the mainstream media tells me.
I had the blue box full of government nonsense at the beginning of this video
YEah what do scientists know...............
That is the bit you should have listened to. It was all the rest that was nonsense.
Of course, the idea that CO2 raised or raises the temperature on Earth is totally false. I stopped watching after hearing this piece of dis-info. Milankovich cycles do exist, but I do not want to hear it from a guy who doesn't have a clue about CO2.
So CO2 doesn't have better insulative properties than the other atmospheric gasses?
@@GuardianSoulkeeper No. 1) CO2 absorption spectrum is almost identical to that of O2. When you burn carbon, the O2 from the atmosphere gets replaced by CO2 molecules. So, nothing changes in terms of absorption of infra-, visible and UV light. 2) So called "human emissions" make up only 3% of CO2 in the atmosphere, at worst. 3) The total amount of CO2 in the atmosphere is overridden by the volcanic activities and temperature of the oceans - no human activities matter here.
@@skrzek 1) Really? So what's happening in those experiments where heat sources observed through containers with CO2 gas appear dimmer in the IR spectrum than those with O2 gas?
2) That's about a trillion tons...
3) Humans emit approx 60 times more CO2 than volcanic activity. Where's your source?
@@GuardianSoulkeeper What experiments? CO2 is colorless and odorless gas. I have purposely released CO2 gas from welding tanks just to see if it produces smoke and so on. You cannot see CO2 or tell the difference from other gases in the atmosphere. "All those experiments" produce smoke because of other gases mainly water vapor. 2) Trillion tons or not, it is still only three percent of CO2 contributed to the atmosphere. There is a massive number of active volcanoes that release gases all the time and on top of it you forgot to take into account the buffering action of the oceans. My best source is the scientific data presented and promoted by Al Gore. He showed the correlation between the CO2 content in the atmosphere and temperature of the oceans. Undisputedly, the CO2 level in the atmosphere lag between 200 to 500 years behind changes in the temperatures of the oceans.
@@skrzek There's a mountain of scientific evidence--thousands of research studies--proving that our emissions of CO2 (which raised global levels of CO2 by 50%) caused almost all recent global warming. What many people don't understand is why CO2 is THE main atmospheric control knob of global temps: Specifically, as a non-condensing gas that stays aloft for centuries, one you add much more CO2 to the atmosphere, it sets in motion a chain reaction that leaves global temps elevated for centuries. A large part of this effect is because jacking uop CO2 levels also jacks up global levels of water vapor and methane.
this video kinda gay ngl
I hate when you use a flat map instead of a globe, it shows you don’t really care or understand what you are explaining. I shut off your video there
You didn't get as far as 1;40 then?
The Milankovitch cycle is a very artificially constructed cycle. But ancient books as the Indian Mahabharata and the Mayan Popol Vuh, tell us that the Earth is suffering from a cycle of seven natural disasters. The only possible natural cause of this cycle can be a ninth planet in our solar system, orbiting our sun in an eccentric orbit. Those disasters are causing massive floods, earthquakes, hurricanes and a bombardment of fiery meteors every few thousand years. Several animal species become extinct and mankind hardly survives. If you don't know this cycle, history is incomprehensible. To learn much more about the cycle of recurring floods, the recreation of civilizations and its timeline, and ancient high technology, read the eBook: "Planet 9 = Nibiru". You can read it on any computer, tablet or smartphone. Search for: invisible nibiru 9
Have you been talking to Greta again?
@@frankmoore7292 No, I studied ancient information for many years and I found abundant and convincing evidence, both in texts as in pictures, about this recurring disaster. The next disaster will not occur for several thousands of years.
It's not. It just doesn't show you, the bigger picture or other things which cause climate change.
The 9th planet theory has been fully debunked.
@@SophiaAphrodite What must I do with many depictions of the so called invisible planet? The youngest are only just over 2,000 years old. And I have depictions of its orbit and its whereabout. Keep on denying!
Earth is only 7000 years old
Дај бре не брукај се, и обриши ту своју глупост !!!
OMG ... th-cam.com/video/WtBT3M-RIZ0/w-d-xo.html
Yes, of course, we all agree with you .
Close enough for a Kovacevic. Most Kovaceviceses I know think THREE's a huge number.
Hope you’re joking