Written by Christos I. Vournas,
M.sc. mechanical engineer
We do planets and moons surface temperatures comparison.
The presence of atmosphere doesn't warm Earth's surface.
It is the other reasons, not the presence of atmosphere, that make Earth warmer than the Moon by +68°C.
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Key words:
Specular Reflection
Φ - Solar Irradiation Accepting Factor (spherical shape and surface roughness coefficient), for smooth bodies Φ = 0,47 and for rough / porous Φ = 1
Immediate IR Emission
Rotational Warming Phenomenon ( N*cp )1/16
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I’ll try here in few simple sentences explain the very essence of how the planet surface SPECIFIC HEAT "cp"warming Phenomenon occurs.
Lets consider two identical planets "H" and "L" at the same distance from the sun. Let’s assume the planet "H" has a Higher average surface specific heat, and the planet "L" has a Lower average surface specific heat.
Both planets "H" and "L" get the same intensity solar flux on their sunlit hemispheres. Consequently both planets receive the same exactly amount of SOLAR RADIATIVE ENERGY.
Depending on the specific heat capacity of bodies containing the heat energy, the temperatures can be quite different.
For Lower average surface specific heat planet "L" the sunlit hemisphere surface gets warmed at higher temperatures than for Higher average surface specific heat planet "H" the sunlit hemisphere.
The surfaces emit at σT⁴ intensity – it is the Stefan-Boltzmann emission law.
Thus the planet "L" emits more intensively from the sunlit hemisphere than the planet "H".
So there is MORE ENERGY LEFT for the planet "H" to accumulate then. That is what makes for Higher surface specific heat planet "H" to be a WARMER PLANET.
That is how the Planet Surface SPECIFIC HEAT "cp" Warming PHENOMENON occurs.
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David A
04.03.2021 16:07
Yes, and thank you. So once L cools to planet H temperature, it continues to emit more radiation, even when it is cooler.
Christos Vournas
04.03.2021 18:12
IR emission = σTΛ4.
Planet LTday =200K, LTnight =100K
To balance the same energy in = out
Planet HTnight grows higher (100+7,5) K, than HTday goes down (200-1) K.
So the HTmean > LTmean
Thanks ask
Christos Vournas
04.03.2021 17:55
Important - Rough example:
LTday>HTday
LTday - HTday = 20 oC
But
HTnight - LTnight = 50 oC
So HTmean>LTmean
Thanks
Christos Vournas
04.03.2021 17:43
Important topic H on average is always warmer than L because L lit surface emits more intense24/7
For L Tmean=(Tnight+Tday)/2
For H the Tnight↑↑→T↑mean ←T↓day
(Tnight↑↑+T↓day)/2>(Tnight+Tday)/2 Thanks
David A
03.03.2021 13:22
Once the warmer planet L emitted adequet radiation to reach the same T as planet H, would not any further emissions then be equal?
david a
04.03.2021 16:04
Yes, and thank you. Just trying to understand. I should have specified planet L as sunlight side being warmer. Can you be more specific as to your answer. Once planet L cools to planet H temperatur
Christos Vournas
03.03.2021 15:27
Thank you for asking. The planet L is not the warmer planet on average. The planet L is warmer on the sunlit side. The L is on average colder, because during the day it has already emitted more.
Table of contents - Links
0). Explain Rotational Warming Model.
Demonstrate the Initial PREMISE, Links: (1) and (2)
3).The Planetary Temperatures Comparison Criteria.
4). "The total amount of the specularly reflected portion of solar flux"
5). How A Planet Retains The Solar Energy - the role of the Immediate IR emission.
6). Φ -Factor is an analogue of the well known Drag Coefficient Cd=0,47
7). “What ‘portion’ of ‘sunlight’ reaches surface of Earth?”
8). The satellites do not measure Bond Albedo.
9). Stefan-Boltzmann formula J = σ T4 W/m² doesn't apply to terrestrial temperatures.
10). The Theoretical Equation.
12). The actual reason of the observed Global Warming.
13). The Axial Precession's role in Global Warming.
14). The Original Milankovitch cycle.
15). The Reversed Milankovitch cycle.
16). The higher CO2 content in ice core samples relates to colder periods.
17). Sensible Heat /Latent Heat ratio.
18). The conventional greenhouses, and the role of immediate IR emission.
19). NASA Technical Memorandum An Earth Albedo Model
20). The yearly total Immediate IR Emitted solar energy - in our times - is lower.
21). The yearly total reflected solar energy - in our times - is lower.
Appendix - Links
1). Earth's Corrected Effective Temperature (210 K ) calculation.
2). Earth's Average Surface Temperature (288 K ) calculation.
3). Moon's Corrected Effective Temperature (224 K ) calculation.
4). Moon's Average Surface Temperature (220 K ) calculation.
5). Mars' Corrected Effective Temperature (174 K ) calculation.
6). Mars' Average Surface Temperature (210 K ) calculation.
7). Mercury's Corrected Effective Temperature (364 K ) calculation.
8). Mercury's Average Surface Temperature (340 K ) calculation.
9). Titan's Average Surface Temperature (93,7 K ) calculation.
10). Earth / Mars satellite measured mean surface temperatures 288 K and 210 K comparison.
11). Earth's /Moon's temps 288K /220K comparison.
13). Blog.
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The table of contents will be completed some time soon. For more pages view the menu at the top.
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