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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We know, that the on the smooth without atmosphere planet's surface the "absorbed" incident solar flux fraction is Φ (1 - a) S.
Φ (1 - a) S - is what is left to "absorb".
Φ (1 - a) S - is the basis for estimating the planet's theoretical uniform emission temperature.
Te - is the planet's emission temperature calculated by the improved equation:
Te = [ Φ (1-a) S / 4 σ ]¹∕ ⁴
here:
a - is the planet's surface average albedo
Φ - is the spherical surface solar irradiation accepting factor
S - is the solar flux W/m²
σ = 5,67*10⁻⁸ W/m²K⁴, the Stefan-Boltzmann constant
Φ (1 - a) S - is the "absorbed" fraction of the solar flux
(1 - Φ + Φ*a) S - is the reflected fraction of the solar flux
Planet ......Te........ Tmean...... Tsat......... N
............emission equation measured rot /day
.........theoretical..... new.... from orbit
Mercury.. 364 K.... 325,83 K.. 340 K... 1 /176
Earth....... 211 K.... 287,74 K.. 288 K....... 1
Moon .......224 Κ.... 223,35 Κ.. 220 Κ.... 1 /29,5
Mars ........174 K.... 213,21 K.. 210 K .......1
And we observe here that Te is depended only on solar flux and albedo, but with the same Φ = 0,47 gradually subsides from Mercury to Mars from 364 K to 174 K.
Eath and Moon, having the same solar flux, have different Te because Earth has a higher than Moon albedo.
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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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