There's no doubt that when Venus was formed, the planet and it's atmosphere were very hot due to it's compression and increased pressure caused by it's own gravity.
Venus' solar flux is fixed by the distance between the Sun and Venus via the inverse square law.
(I'm assuming variation in Solar emissive power and orbit are insignicant).
Incoming power I = S * πr^2
S is solar irradiance
πr^2 is area exposed to the sun
You describe outgoing radiation E = B x T^4. It's commonly written as:
W = ε σT^4, the Stefan Boltzman equation where:
ε is emissivity
σ is the Stefan Boltzman constant
W Power per square meter.
Total emitted power E = W * 4πr^2
4πr^2 is the surface area of a sphere
Net power:
P = I - E = S * πr^2 - ε σT^4 * 4πr^2
Once Venus was created, 4.5 billion years ago, E > I meaning more energy is emitted than radiated.
The result of this, as energy is lost, is that Venus and it's atmosphere cooled down.
The cooling process would continue until incoming and outging energies balance.
I = E
S * πr^2 = ε σT^4 * 4πr^2
(this is where πr^2 cancels out)
S = ε σT^4 * 4
T^4 = 1/4 * S / ε σ
Take the quartic roots on both sides and you get Venus' effectice temperature of -47C.
There is no way the heat from the creation of Venus 4.5 Billion years ago can explain the difference between the effective (-47C) and actual surface temperature of 464C).
The heat generated at the creation of Venus dissipated Billions of years ago.
So the answer to the question of what causes the excessive temperatures on Venus is not atmospheric pressure.
There's no doubt that when Venus was formed, the planet and it's atmosphere were very hot due to it's compression and increased pressure caused by it's own gravity.
Venus' solar flux is fixed by the distance between the Sun and Venus via the inverse square law.
(I'm assuming variation in Solar emission power and orbit are insignicant).
Incoming power I = S * πr^2
S is solar irradiance
πr^2 is area exposed to the sun
You describe outgoing radiation E = B x T^4. It's commonly written as:
W = ε σT^4, the Stefan Boltzman equation where:
ε is emissivity
σ is the Stefan Boltzman constant
W Power per square meter.
Total emitted power E = W * 4πr^2
4πr^2 is the surface area of a sphere
Net power:
P = I - E = S * πr^2 - ε σT^4 * 4πr^2
Once Venus was created, 4.5 billion years ago, E > I meaning more energy is emitted than radiated.
The result of this, as energy is lost, is that Venus and it's atmosphere cooled down.
The cooling process would continue until incoming and outging energies balance.
I = E
S * πr^2 = ε σT^4 * 4πr^2
(this is where πr^2 cancels out)
S = ε σT^4 * 4
T^4 = 1/4 * S / ε σ
Take the quartic roots on both sides and you get Venus' effectice temperature of -47C.
There is no way the heat from the creation of Venus 4.5 Billion years ago can explain the difference between the effective (-47C) and actual surface temperature of 464C).
The heat generated at the creation of Venus dissipated Billions of years ago.
So the answer to the question of what causes the excessive temperatures on Venus is not atmospheric pressure.
"The assertion that the temperature on Venus is a consequence of a runaway greenhouse effect is misleading, often tied to a manipulated narrative aligned with certain climate agendas."
"In sharp contrast, carbon dioxide (CO2), present in mere trace amounts at 0.04%, assumes a marginal role."
The effect of CO2 is small when compared to the energy fluxes in Earth's energy budget, the current imbalance being ~1.4 W/m^2. However, that's a large enough imbalance to cause the current rapid rise in Earth's average temperature
There's no doubt that when Venus was formed, the planet and it's atmosphere were very hot due to it's compression and increased pressure caused by it's own gravity.
Venus' solar flux is fixed by the distance between the Sun and Venus via the inverse square law.
(I'm assuming variation in Solar emissive power and orbit are insignicant).
Incoming power I = S * πr^2
S is solar irradiance
πr^2 is area exposed to the sun
You describe outgoing radiation E = B x T^4. It's commonly written as:
W = ε σT^4, the Stefan Boltzman equation where:
ε is emissivity
σ is the Stefan Boltzman constant
W Power per square meter.
Total emitted power E = W * 4πr^2
4πr^2 is the surface area of a sphere
Net power:
P = I - E = S * πr^2 - ε σT^4 * 4πr^2
Once Venus was created, 4.5 billion years ago, E > I meaning more energy is emitted than radiated.
The result of this, as energy is lost, is that Venus and it's atmosphere cooled down.
The cooling process would continue until incoming and outging energies balance.
I = E
S * πr^2 = ε σT^4 * 4πr^2
(this is where πr^2 cancels out)
S = ε σT^4 * 4
T^4 = 1/4 * S / ε σ
Take the quartic roots on both sides and you get Venus' effectice temperature of -47C.
There is no way the heat from the creation of Venus 4.5 Billion years ago can explain the difference between the effective (-47C) and actual surface temperature of 464C).
The heat generated at the creation of Venus dissipated Billions of years ago.
So the answer to the question of what causes the excessive temperatures on Venus is not atmospheric pressure.
The obvious cause is the GHG effect.
There's no doubt that when Venus was formed, the planet and it's atmosphere were very hot due to it's compression and increased pressure caused by it's own gravity.
Venus' solar flux is fixed by the distance between the Sun and Venus via the inverse square law.
(I'm assuming variation in Solar emission power and orbit are insignicant).
Incoming power I = S * πr^2
S is solar irradiance
πr^2 is area exposed to the sun
You describe outgoing radiation E = B x T^4. It's commonly written as:
W = ε σT^4, the Stefan Boltzman equation where:
ε is emissivity
σ is the Stefan Boltzman constant
W Power per square meter.
Total emitted power E = W * 4πr^2
4πr^2 is the surface area of a sphere
Net power:
P = I - E = S * πr^2 - ε σT^4 * 4πr^2
Once Venus was created, 4.5 billion years ago, E > I meaning more energy is emitted than radiated.
The result of this, as energy is lost, is that Venus and it's atmosphere cooled down.
The cooling process would continue until incoming and outging energies balance.
I = E
S * πr^2 = ε σT^4 * 4πr^2
(this is where πr^2 cancels out)
S = ε σT^4 * 4
T^4 = 1/4 * S / ε σ
Take the quartic roots on both sides and you get Venus' effectice temperature of -47C.
There is no way the heat from the creation of Venus 4.5 Billion years ago can explain the difference between the effective (-47C) and actual surface temperature of 464C).
The heat generated at the creation of Venus dissipated Billions of years ago.
So the answer to the question of what causes the excessive temperatures on Venus is not atmospheric pressure.
The obvious cause is the GHG effect.
Jupitor is the worst possible example to use in this document.
- It's the least understood (nobody is certain what is happening near the core)
- the atmosphere does not approximate to ideal gases due to high pressures
- Jupitor has a significant internal heat source
"Rather, the explanation is more straightforward: temperature elevation correlates with pressure increase."
Yes, temperatures fall with altitude in the troposphere (usually). Temps can rise with reduced pressure as in Earth's stratosphere.
The high Venus surface temperature is not caused by high pressure and you havn't shown that it is.
"The assertion that the temperature on Venus is a consequence of a runaway greenhouse effect is misleading, often tied to a manipulated narrative aligned with certain climate agendas."
You're incorrect opinion
"The earth’s climate is all about water. Oceans, clouds, rain, vapor and their complex interplay."
Clearly not. Apart from the other greenhouse gases, there's albedo, criosphere and the sun!
"In sharp contrast, carbon dioxide (CO2), present in mere trace amounts at 0.04%, assumes a marginal role."
The effect of CO2 is small when compared to the energy fluxes in Earth's energy budget, the current imbalance being ~1.4 W/m^2. However, that's a large enough imbalance to cause the current rapid rise in Earth's average temperature
"Venus' surface temperature stands as an anomaly owing to its exceptionally thick atmosphere (92 bar)"
I think you should clarify the meaning of 'thick'.
If you mean due to the pressure, the statement if incorrect.
If you mean due to the large amount of CO2, it should say so.
A question. Why didn't you use the Stefan=Boltzmann equation including emissivity?
Emissivity varies quite a bit, e.g. Earth ~0.7, Venus ~0.3
"The dominant effect for the high temperature is simply fundamental physics and a well know relation.
P V = N k T"
Not true. High temperatures cannot be sustained by high pressures.
Many gases can be treated as ideal gases. However, at extreme pressures, their behaviour deviated significantly.
"Under such intense pressure, the surface temperature on Venus would likely have soared to thousands of degrees Celsius"
That's only true if high atmospheric pressure causes an increase in a planet's surface temperature, which isn't correct.
Remember, the planets formed around 4.5 billion years ago.
"At 1 bar, the observed temperature is around 30°C, in line with expectations."
Can you go into more detail here. Whatare these expectations based on.
Can you please expound on "To resolve B, we use -18°C for earth (the reported no atmosphere value). "?
Is this saying earth generates heat from within itself that means it reaches a net -18C with no atmosphere but assuming its molten core, etc?