与地球的日常旋转相比，地球的内芯旋转有多快?内核通常被描述为一个旋转/旋转的实心内核，而地球每天只转一圈。我一直想象它是一个快速旋转的陀螺，但意识到与地球自转相比，我实际上不知道它是一个更快的旋转还是更慢的旋转。即使我知道速度(我不知道)，一个数字也没有任何意义，除非与一些相关的东西相比。
那么与24小时旋转相比，核心旋转快/慢多少?例如，内核每一天旋转25或2.5次。或者说，内核每1天旋转0.5次。< / p >
地核有百分之多少是铀?核心的热量有多少来自放射性衰变而不是其他力量?< / p >
- 地球形成的剩余能量
- 核内元素的放射性
- 核与旋转更快的外层之间的摩擦
然而，我还没有发现任何迹象表明高压是一个因素。那么，地核内部的巨大压力导致了它的高温吗?
EDIT:如果没有，我想知道为什么。如果压力是分子的动能，我认为压力越大温度越高，类似于理想气体定律
断言引用this paper发表于1994年。
这种几十年的气候周期在气候学家中被广泛接受吗?在这项研究之前，它可能被归因于内核旋转之外的其他原因?
那么内核旋转如何影响气候?< / p >
-Yang, Y., Song, X. (2023): "Multidecadal variation of the Earth’s inner-core rotation." Nature Geoscience. https://doi.org/10.1038/s41561-022-01112-z
-Schlesinger, M., Ramankutty, N. (1994) "An oscillation in the global climate system of period 65–70 years." Nature 367, 723–726. https://doi.org/10.1038/367723a0
我最近研究了超离子冰这基本上是水在如此大的压力和热量下，它变成了黑热的冰。我读了这篇文章关于它。我发现超离子冰存在于地球内部，但我无法理解它是如何进入地核的，考虑到海洋中的任何水基本上至少在地幔以下是封闭的，因为它会立即蒸发，导致蒸汽气泡上升，直到它再次冷却
有人读过(最新的)ipcc报告全文吗?你知道他们在模型中是否考虑到了地核温度吗?除了ipcc报告，我们知道它对地球表面的气候和温度有多大影响吗?我猜，地球的核心温度是气候模型需要的一个非常重要的变量
地核要多久才能凝固?问题引用了一项估计，即地球(作为一颗行星，而不是它的表面)自形成以来已经冷却了约250K。问题是，由于这种冷却，地球的有效直径/平均直径减小了多少?
此外，考虑到地壳“几乎立即”出现;在地球形成后大约1亿年，由于这种冷却，地球发生了什么?< / p >
There is also the effect of the Earth's mass increase due to its gravitation pulling cosmic dust as well as cosmic bodies falling onto it, which surpass the loss of mass through the atmosphere, thus slightly increasing the weight of crust and its pressure against the mantle.
Obviously, the crust is too (relatively) thin and weak to allow emptinesses/cavities/hollows appearing under itself because of the shrinkage of the inner matter, so it was breaking in places thus forming continents that float over the mantle and "falling" downwards a bit instead, right?
Or the additional volume because of the cooling did not really change the Earth's effective/average diameter at all since the mantle (and deeper layers) was pushing against the crust with high pressure in the first place so the decrease of volume of the Earth's innards did not happen and it all only ended up decreasing the pressure against the crust, thus decreasing volcanic activity instead of changing the effective/average diameter of the planet?
Thanks in advance.
(The question was inspired by Dunno on the Moon scientific fiction novel, which is obviously unrealistic, but is fun to wonder about hypothetically in terms of real-life physics.)
I thought the same could happen if the matter currents giving rise to Earth's magnetic field changed direction, this would cause an increase in speed too. That is, if the currents have the right direction. The reversal of the currents' momentum (if such currents exist but I don't see why not) could also decrease the speed.
So, are these scenarios realistic?
“此外，没有令人信服的实验证据表明，在目前的核幔边界条件下，Si被提取到地核中。例如，在一个高压/高温的陆地岩浆海洋的底部，Si的金属/硅酸盐分配系数大约是10^{-3}$到10^{-2}$"
但由于这篇论文是在12年前发表的，我想知道是否有任何令人信服的证据表明Si在地核中，它的浓度可能是多少?它是如何到达那里的?< / p > < p > < >强引用< /强> < / p > < p >德雷克,M,改正者,K。2002。决定地球的组成。
I would also expect this to happen in spite of the density gradient, that anyway should be less relevant down there, where the acceleration of gravity is much smaller than in the surface.
Why this dissolution doesn't happen? Why is the outer core stable?
As a bonus question inspired by this one: would any other blob of molten iron be stable anywhere in the mantle?
如果是这样，它会导致冰河时代吗?如果不是，地核是如何保存热量的呢?< / p >
维基百科的地震波包含下面的S波和p波速度作为地球深度的函数的图。在外核区域，s波或横波的速度被显示为零，但实际上它们是消失的，所以速度可能是复杂的。然后在内核边界处，s波的速度再次向下显示到地球中心，相当平坦，接近4公里/秒。
地球内核中的横波速度是一个测量量还是只是推导出来的?如果它被测量了，如果横波不能通过外核传播，它们是如何到达核心的?
So how is it that pressure drops off fast enough relative to temperature to give rise to the liquid outer-core. A good answer will explain how temperature drops off with radius and how pressure drops off with radius and how these compare to give rise to the liquid outer-core.
The fact that tall buildings and houses are being excavated from under the ground means that we are living very much away from earth's core than the past.
Does this mean that we are experiencing less gravity compared to past Since we are further from the earth's core that causes the pull?
Note: Parent question Was the Earth's sea-level significantly lower in ancient times?
asking as separate question as per community suggestion
A。组成内核的铁镍合金比地幔和外核中的其他元素更重，导致它下沉到地球的中心。< / p > < p > B。由于铁和镍都受到磁铁的吸引，地球的磁场将这些金属吸引到内核中，将它们混合成合金。< / p > < p > C。地球一开始是一颗巨大的小行星，由铁镍合金组成(很多都是铁镍合金)，其他来自太空的物质建立在它上面，导致地球有一个铁镍核心(我告诉过你他们疯了!)
但是这些解释对我来说没有多大意义
全球变暖会改变这些估计吗?< / p >
自然通讯文章"到地核的任务-一个谦虚的建议"，建议在裂缝中放置大量液态铁，让它一直下沉到地核，携带一个可以使用地震波传输数据的探测器。这是一个有趣的想法。虽然可能有许多技术问题，但我觉得似乎没有什么是不可克服的，值得一试。但是，我想知道为什么作者建议使用液态铁而不是液态铅。我希望铅更便宜，也需要更小的体积来实现相同的断裂应力(由于密度更高)。此外，较低的熔点有利于裂纹在表面附近扩展。
铅会溶解在周围的岩浆中吗?它会发生化学反应变成更轻的化合物吗?
由于原文是在付费墙后面，我在这里复制正文:
Google returns a radius of 1220km for the inner core. It also returns a diameter of 1220km for the inner core.
I went so far as to reimplement this an an Excel spreadsheet to double check my code, and I get consistent results.
Is there a good source for the (rough is fine) densities, mass, and radii of the geological layers? I don't trust Google and Wikipedia at this point, and even if I find the answer somewhere else I won't know for sure if they're even close to correct.