地球的核心失去热量吗?- 江南体育网页版- - - - -地球科学堆江南电子竞技平台栈交换 最近30从www.hoelymoley.com 2023 - 07 - 30 - t18:21:43z //www.hoelymoley.com/feeds/question/428 https://creativecommons.org/licenses/by-sa/4.0/rdf //www.hoelymoley.com/q/428 26 地球的核心失去热量吗? 晚礼服 //www.hoelymoley.com/users/181 2014 - 04 - 22 - t16:36:55z 2020 - 05 - 06 - t13:28:22z < p >将所有的钻井和挖掘使用地球的自然热地热能源影响地球的核心,使其降温?< / p > < p >如果是这样的话,它会导致一个冰河时代?如果不是这样,地球的核心如何保持其热吗? < / p > //www.hoelymoley.com/questions/428/-/429 # 429 20. 答案通过Neo地核失去热量吗? Neo //www.hoelymoley.com/users/32 2014 - 04 - 22 - t16:46:28z 2014 - 04 - 22 - t18:22:00z < p >这个问题是相关的,< a href = " //www.hoelymoley.com/questions/94/why-is-the-inside-of-the-earth-so-hot/97 # 97 " >里面的地球为什么那么热?< / > < / p > < p >简短的回答是核心正在失去热量无论我们做什么。你看,从核心热量传递到表面,但其重要的热的能量。因为在地球上有限的能源,我们将从内部能量转移到。它的工作原理类似于内燃机里面你的车。你转换一个电位差(高温和低温)转化为机械能。在地球的情况下,这种机械能表示为对流细胞,哪个驱动器板块构造。最终,发动机运行的气体,或者在地球的情况下,能量,并将开始降温。< / p > < p >核心冷却下来时,我不认为一个冰河时代将想说的权利。火星将会是一个很好的例子,地球会发生什么当它失去了它的大部分热量。不再会有像火山构造事件,地球将会是一个寒冷的球的质量。将会有大量的冰,但最终宇宙辐射和太阳风将摧毁大气而不保护地球的磁场基本同质表面留下贫瘠的星球。 So sure, it will cause an ice age, but the ultimate destiny of the planet is barren, with a solid non-convecting mantle and core.

Edit:

I want to add this this is largely speculation, that we really don't know what will happen. I just assume that Earth will share a similar fate to Mars. Mars once had a magnetic field protecting its atmosphere, but as the planet cooled off the field disappeared. Mars's historic magnetic field is an area of contentious research.

As gerrit pointed out, Venus has an atmosphere without a magnetic field, so this is clearly postulation. Perhaps an expert will shed light on this question (How long) would Earth's atmosphere last without a global magnetic field?

//www.hoelymoley.com/questions/428/-/431 # 431 32 gerrit回答的地核失去热量吗? gerrit //www.hoelymoley.com/users/6 2014 - 04 - 22 - t17:40:48z 2014 - 04 - 23 - t23:23:55z < p >第1部分,请参见< a href = " //www.hoelymoley.com/a/429/6 " > < / >近地天体的答案。地球将失去热量无论我们做什么,我们提取地热能是微不足道的(< a href = " https://en.wikipedia.org/wiki/Geothermal_energy # cite_ref-5”rel = " noreferrer " >维基百科引用英国石油(BP)图11.4 GW电力、28 GW加热< / >)。< / p > < p >第2部分回答你的问题:如果地球核心失去热量,这不会有重大的直接影响气候。<强>内部热代估计< /强> < a href = " http://www.solid - earth.net/1/5/2010/se - 1 - 5 - 2010. - html”rel = " noreferrer " >戴维斯和戴维斯(2010)< / > < >强大约是< /强> 47太瓦。表面面积5.1报;10 <一口> 14 < /一口> m <一口> 2 < / >一同晚餐,这相当于大约<强> 0.1 W / m <一口> 2 < /一口> < / >强。这可以与气候系统中的其他流相比,说明了< a href = " http://link.springer.com/article/10.1007%2fs10712 - 011 - 9150 - 2”rel = " noreferrer " > Trenberth Fasullo, 2012 < / >: < / p > < p > < img src = " https://i.stack.imgur.com/Oydvq.png " alt =“全球能量流”> < br / >本;Trenberth,凯文·E。和约翰·t·Fasullo。“跟踪地球能量:从厄尔尼诺现象对全球变暖。”Surveys in geophysics 33, no. 3-4 (2012): 413-426. Weblink

So, from a climate perspective, internal heat generation is not important. See also this post on skepticalscience.

However, we might lose our atmosphere, which would have inconvenient consequences. An ice age would be the least of our worries. A subsequent question would be: (How long) would Earth's atmosphere last without a global magnetic field? That is a different question and I'm not sure if we really know the answer.

//www.hoelymoley.com/questions/428/-/438 # 438 18 回答由user2338816地核失去热量吗? user2338816 //www.hoelymoley.com/users/198 2014 - 04 - 23 - t00:01:41z 2014 - 04 - 23 - t00:01:41z < p >把炉子燃烧器上的煎锅,锅热。测量其温度每一分钟都在半个小时左右的时间来了解如何快速自然冷却。< / p > < p >然后开始实验了一遍又一遍。这一次,拿一根针和触摸其提示,煎锅,充当一个散热器。煎锅和针的相对大小将近似“地球和当前地热能量转移的方法”。测量冷却在接下来的半个小时。< / p >

If you run the two experiments a few times and compare results, you should find that it's practically impossible to detect any difference. The results can be extrapolated to estimate effects on the Earth, and a plausible conclusion is that it won't make a meaningful difference.

The simple reason is that our current geothermal efforts (as well as any currently projected future efforts) are so vanishingly small when compared to the size of the Earth that it has less effect than we can measure.

Now, that doesn't mean that some radical future change in technology won't change things. But no one can answer on those terms except to assert that we could make a significant difference if we could advance technology far enough.

//www.hoelymoley.com/questions/428/-/458 # 458 13 答案由Eric Lippert地核失去热量吗? 埃里克。 //www.hoelymoley.com/users/225 2014 - 04 - 23 - t15:28:55z 2014 - 04 - 23 - t15:40:35z < blockquote > < p >所有的钻井和挖掘使用地球的自然热地热能源会影响到地球的核心,使其降温?< / p > < /引用> < p >是的。但多少?让我们做一些粗略的数学。我们在这里只是关心数量级。< / p >

Suppose we have a uniform sphere the size of the Earth. Call it 1021 cubic meters.

Suppose this sphere is made of rock that is four times more dense than water. Water weighs 1000 kg per cubic meter.

Of course the Earth is not uniform; it is made up of rocks that are less dense and metals which are more dense. We're doing some rough math here.

And let's suppose that the interior of our planet is of uniform temperature, say, 5000 Kelvin.

Again, of course the Earth is not uniformly hot throughout. Again, we're doing rough math here, just to get an idea of the order of magnitude involved.

Let's suppose that our ball of rock is not producing new heat. Of course the Earth is producing new heat inside it, for instance, from radioactive elements in the core. But let's suppose that it is not.

And let's suppose that our ball of rock has a specific heat capacity of 0.8 joules per kilogram * kelvin. The specific heat capacity roughly speaking tells us how much energy is in some amount of a substance at a particular temperature. So multiply that out.

(1021 cubic meters) x

(4000 kg / cubic meter) x

(5000 kelvin) x

(0.8 Joules per kilogram * kelvin) =

1.6 x 1028 joules

We're just looking for an order of magnitude here. Our ball of rock has roughly 1028 joules of thermal energy.

Now let's suppose that we extract some amount of those joules. Total energy consumption of humanity from all sources -- nuclear, gas, etc -- is about 1018 joules per year. If we got 100% of that from our ball of hot rock, it would cool it off by one-ten-billionth of its total heat every year.

That's making the worst possible assumptions; of course we do not get anywhere even close to all our power from geothermal, the energy we do get was just going to be wasted into the atmosphere eventually anyway, the earth does make its own heat, and so on. We could get our total power needs met by geothermal energy for trillions of years without worrying about cooling the core.

how does it retain its heat?

The same way anything other ball of rock retains its heat. Heat, like all forms of energy, is retained indefinitely until something acts to remove it. I'm not clear on what question you're actually asking here.

//www.hoelymoley.com/questions/428/-/465 # 465 4 回答由mistermarko地核失去热量吗? mistermarko //www.hoelymoley.com/users/231 2014 - 04 - 23 - t17:47:40z 2014 - 05 - 03 - t06:11:11z < p >你必须开始热的原因:放射性同位素分布于整个地球,由于热辐射发生在表面,越变得越热。放射性同位素衰变以固定速率和一些很长的一半生活这热量释放超过地球的寿命。地球的热量不是(是吗?)由于动能的形成或潮汐挤压遗留月亮。因为规模将会使我们做很多改变这种情况。< / p > //www.hoelymoley.com/questions/428/-/467 # 467 13 回答由Mr.Mindor地核失去热量吗? Mr.Mindor //www.hoelymoley.com/users/230 2014 - 04 - 23 - t18:40:08z 2014 - 12 - 24 - t07:13:27z < blockquote > < p >…使其降温?< / p >

This answer to the question 'Why has Earth's core not become solid?' over on Physics seems to claim the answer is no.

The core is heated by radioactive decays of Uranium-238, Uranium-235, Thorium-232, and Potassium-40, all of which have half-lives of greater than 700 million years (up to about 14 billion years for Thorium).

The core isn't hot just because of remnant heat left over from formation, the heat energy in the core is continually renewed by radioactive processes.

If so, would it result in an ice age?

This energy from the core must already be continually dissipated up through the mantle, through the crust, into the atmosphere and eventually into space (or else the planet would be heating up).

All we could possibly do is speed the dissipation of this energy through the crust, any energy we extract would get to the surface anyway.

As others have pointed out geothermal energy is a tiny fraction of what heats our atmosphere, most of that comes from the sun.

Even if this were not the case, for us to cause an ice age, would require us to have near complete control over geothermal release through artificial means. We would have to extract enough energy over a long enough period from deep enough in the earth that there was no longer significant natural heat dispersion through the crust. Then we would have to stop and bottle up our manual extraction so that the heat had no other means to escape but rising through the crust in the natural way. The heat present in the atmosphere would dissipate into space far quicker than new heat would rise through the crust.

I imagine both the process of our intervening to the point of control, and our sudden relinquishing control would both have significant effects aside from climate change: earthquakes, volcanic eruptions, disrupting continental drift...

If not, how does it retain its heat?

I hope it is clear that it doesn't.

//www.hoelymoley.com/questions/428/-/16307 # 16307 2 回答由CL4P-TP地核失去热量吗? CL4P-TP //www.hoelymoley.com/users/15268 2019 - 02年- 21 - t11:55:53z 2019 - 02年- 21 - t11:55:53z < p > 20 tw[1]地球产生的热能在地幔放射性衰变。这是温暖地球产生的数量,所以它应该给我们一个大概的想法,我们需要多少热量从地球上消除为了使影响地球内部温度。总结加热情况下地壳,现有~等量的热量来自两个来源:放射性衰变,剩余的热量从地球的创建[1]。大量的热冲击地球从太阳但会辐射退出;它并没有与内部温度[1]。< / p >

[1] https://en.wikipedia.org/wiki/Earth%27s_internal_heat_budget

As far as I can tell from that wikki page: Current heat in the earth: ~50% radiation, ~50% leftover Internal heat budget: Geothermal Power Consumption + 47TW transferred from the mantle to the crust and beyond[1] - 20TW generated from radiation = Core cooling rate Core cooling rate without geothermal: 0 + 47TW - 20TW = 27TW

The world consumed 22,000 TWh in 2017[2]. That means an average power consumption of 2.5TW. If all of that was geothermal, we'd be increasing the cooling rate of the earth's core by about 10%.

[2] https://yearbook.enerdata.net/electricity/electricity-domestic-consumption-data.html

So based on that, how quickly does each TW of geothermal power cool the earth? Well, I looked at the most abundant elements of the earth by mass, and found that the weighted average thermal capacitance is about 1000 J/kg/deg C. To get a ballpark idea of the impact 1 TW would make, I'll use that number, and an average internal temperature of 3000 degrees C. To calculate that the thermal energy of the earth, I'll use Q=McdT I'll consider a thermal window between 0C and 3000C. The difference in the earth's thermal energy between those points is on the order of 1.8x10^31 J.

In one decade, a 1TW source generates 3.2x10^20 J. In order to have a 1% impact on the average internal temperature of the planet (30 degrees C for our window of analysis), a 1TW source would have to work full time until the sun consumed the earth in 5 billion years.

I think this is awesome! I wanted to see how awesome though.

What about the fact that humans seem to double their power demand every decade or so? I threw together a quick spreadsheet table and simulated it century by century to see how long it took to get measurable effects on the earth's temperature as our power demands go up through time.

It turns out that if we were to convert all our power generation to geothermal today, and double our total global geothermal power generation every decade, we would get 8,400 years of clean energy before cooling the earth's core by 1%!

We would have to make a change soon after though, because if we continued on like that, we'd totally deplete the earth's warmth in centuries. By that time though, we might even have powerful enough technology to reheat the earth artificially.

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