<p>While Venus is not tidally locked to the sun, it rotates slow enough that you might as well consider it tidally locked.</p>
<p>However you have to disentangle the slow rotation from the superrotating atmospheric motion. The fast atmospheric rotation (as reaction of the atmospheric gases to the intense solar radiation) redistributes heat very efficiently in the upper atmosphere.</p>
<p>In the <a href="https://en.wikipedia.org/wiki/Atmosphere_of_Venus#Troposphere" rel="nofollow noreferrer">lower atmosphere,</a> no significant winds are observed, but the atmosphere has a large density, which through heat conduction again makes redistribution of heat efficient.</p>
<p>All in all, Venus' atmosphere has therefore a horizontally uniform temperature. Said differently, next to no dayside-nightside temperature gradients exist. Nothing will precipitate.</p>
<p>Furthermore the <span class="math-container">$CO_2$</span> at the surface is superfluid due to the intense pressure, and this state doesn't seem to form droplets, it IS a sort of highly-viscous <span class="math-container">$CO_2 $</span>-ocean.</p>

CC BY-SA 4.0
2021-05-18T01:23:36.583Z
Would not superrotation disappear if the planet was locked?
Anixx
CC BY-SA 4.0
2021-05-18T01:27:23.910Z
@Anixx: There is nothing magic in a tidally locked state compared to the extremely slowly rotating state that Venus is in now. So for the purposes of atmospheric dynamics the planet is non-rotating, the same as it would be essentially non-rotating in a tidally locked state. Therefore the answer is, no, as it already has superrotation.
AtmosphericPrisonEscape
CC BY-SA 4.0
2021-05-18T01:28:13.977Z
@Anixx: Is there a physical reason why you would presume superrotation to disappear?
AtmosphericPrisonEscape
CC BY-SA 4.0
2021-05-18T01:30:15.943Z
Where the supertotation gets angular momentum?
Anixx
CC BY-SA 4.0
2021-05-18T01:36:44.257Z
@Anixx: Initially, always from the dayside pressure-gradients. Just as with any wind. The wind then equilibrates the pressure gradients that created it. However in details this story for Venus is very much more complex, have a look here for example, https://science.sciencemag.org/content/368/6489/405
AtmosphericPrisonEscape
CC BY-SA 4.0
2021-05-18T01:11:42.533Z
2021-05-18T05:16:00.830Z
2021-05-18T05:16:00.830Z
AtmosphericPrisonEscape
<p>Suppose, Venus becomes tidally locked. Will its dark side cool enough so that the CO<sub>2</sub> from atmosphere to precipitate in liquid form to make an ocean?</p>

CC BY-SA 4.0
2021-05-17T15:45:53.423Z
Planetology is earth science.
Anixx
CC BY-SA 4.0
2021-05-17T15:49:06.653Z
I just noticed an Answer on Meta Earth Sciences, your question is on-topic  I was just suspicious about this one because of the Name of this site.
Tardy
CC BY-SA 4.0
2021-05-18T01:02:52.173Z
The question should easily fit earthscience.se as the same physics, chemistry and geological principles as on Earth are applicable to the other solar system objects.
AtmosphericPrisonEscape
<atmosphere><planetary-science><climate-models><atmosphere-modelling><climatology>
Climate on Venus after it becomes tidally locked
Anixx
# Climate on Venus after it becomes tidally locked

(Asked by: username_0 on 2021-05-17)

Suppose, Venus becomes tidally locked. Will its dark side cool enough so that the CO2 from atmosphere to precipitate in liquid form to make an ocean?

**Tags:** atmosphere, planetary-science, climate-models, atmosphere-modelling, climatology

> **Comments:**
> **username_0**: Planetology is earth science.  
> **username_1**: I just noticed an Answer on Meta Earth Sciences, your question is on-topic  I was just suspicious about this one because of the Name of this site.  
> **username_2**: The question should easily fit earthscience.se as the same physics, chemistry and geological principles as on Earth are applicable to the other solar system objects.  

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## 1 answers

### Answer by username_2 on 2021-05-18. Score: 2

While Venus is not tidally locked to the sun, it rotates slow enough that you might as well consider it tidally locked.

However you have to disentangle the slow rotation from the superrotating atmospheric motion. The fast atmospheric rotation (as reaction of the atmospheric gases to the intense solar radiation) redistributes heat very efficiently in the upper atmosphere.

In the [lower atmosphere,](https://en.wikipedia.org/wiki/Atmosphere_of_Venus#Troposphere) no significant winds are observed, but the atmosphere has a large density, which through heat conduction again makes redistribution of heat efficient.

All in all, Venus' atmosphere has therefore a horizontally uniform temperature. Said differently, next to no dayside-nightside temperature gradients exist. Nothing will precipitate.

Furthermore the $CO\_2$ at the surface is superfluid due to the intense pressure, and this state doesn't seem to form droplets, it IS a sort of highly-viscous $CO\_2 $-ocean.

> **Comments:**
> **username_0**: Would not superrotation disappear if the planet was locked?  
> **username_2**: @username_0: There is nothing magic in a tidally locked state compared to the extremely slowly rotating state that Venus is in now. So for the purposes of atmospheric dynamics the planet is non-rotating, the same as it would be essentially non-rotating in a tidally locked state. Therefore the answer is, no, as it already has superrotation.  
> **username_2**: @username_0: Is there a physical reason why you would presume superrotation to disappear?  
> **username_0**: Where the supertotation gets angular momentum?  
> **username_2**: @username_0: Initially, always from the dayside pressure-gradients. Just as with any wind. The wind then equilibrates the pressure gradients that created it. However in details this story for Venus is very much more complex, have a look here for example, https://science.sciencemag.org/content/368/6489/405  

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