Comments by "Mark Pawelek" (@mark4asp) on "I Misunderstood the Greenhouse Effect. Here's How It Works." video.
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This explanation of the greenhouse gas effect, GHGE, is factually biased, and misinforms. When explaining earth's cooling Sabine only talks about infrared radiation. But there are 3 ways heat is transported: conduction, convection, and radiation. Sabine takes her cue from the self-styled "Climate Consensus" (CC), who are the IPCC, and your government, and other authorities. They claim that, at the surface of earth, cooling is:
W/m²
390 ------- 79% radiation (infrared)
24 --------- 5% convection and conduction
78 --------- 16% latent heat transport
492 ------- total
In practice all that latent heat must be transported by convection. So the simpler version has 21% convection and conduction / 79% radiation (infrared).
But their (CC) claim for 390W/m² of average infrared cooling, at the surface, is a massive exaggeration; achieved by misusing the Stefan-Boltzmann Law. In fact the operation of the Pirani gauge shows actual cooling of the surface immersed in an atmosphere will be 99.6% due to convection and conduction, with hardly any infrared [ see (3) ]
When the Stefan-Boltzmann Law was derived, 150 years ago, experimental derivation measured cooling by objects in vacuum. Earth's surface is not in a vacuum. When, in face, objects cool immersed in air they cool way quicker. 250 times faster.
-------------------------------------- IR radiation ---- Conduction/Convection
Sea level ---- GHGE model --------- 79% ---- 21%
80+ km --------- 0.004 Torr ---------- 79% ---- 21%
76.2 km -------- 0.02 Torr ------------ 50% ---- 50%
33.5 km -------- 10 Torr -------------- 0.7% ---- 99.3%
Sea level ------ 760 Torr ------------- 0.4% ---- 99.6%
Eventually when the atmosphere is very rarified - at high altitudes - radiative emission will cause most cooling. ( in the Mesosphere !).
GHGE "theory" says that a radiative imbalance causes the GHGE and this imbalance happens far below, close the top of the Troposphere! Our new understanding that heat transport below 76km is dominated by conduction & convection rules out GHGE warming of the surface. Since the theoretical surface warming is due to the ToT being higher for GHG with more CO2 in the atmosphere. See Hansen 1981.
James Hansen's influential GHGE model (no doubt still used by many to calculate "radiative forcing" ) depends on radiation escaping at the ToT = Top of the Troposphere - about 10 km above our heads. So that model is clearly nonsense. Basic fact-checking tells us that at 10km the pressure is ~ 523 Torr, and the balance there is still close to what it is at the surface ( > 99.5% conduction/convection).
Yet Hansen calculated his GHGE based on: "The basic physics underlying this global warming, the greenhouse effect, is simple. An increase of gases such as CO2 makes the atmosphere more opaque at infrared wavelengths. This added opacity causes the planet's heat radiation to space to arise from higher, colder levels in the atmosphere, thus reducing emission of heat energy to space. The temporary imbalance between the energy absorbed from the sun and heat emission to space, causes the planet to warm until planetary energy balance is restored." - Hansen et al, 1981.
To summarize Hansen - the GHGE is due to the radiation window (to space) beginning at a higher (therefore cooler) place at the top of the troposphere. Because it's cooler there - energy is emitted with less energy!
So a GHGE is ALL about where this atmospheric window to space opens. Is it 10km above (ToT) as Hansen modelled it, or is it +75km above where reality says it should be?
Note:
In earth's atmosphere:
Troposphere ~ 0 - 10 km
Tropopause ~ 10 - 20 km
Stratosphere ~ 20 - 47 km
Stratopause ~ 47 - 53 km
Mesosphere ~ 53 - 84 km
Mesopause ~ 84 km
Thermosphere
Citations:
(1) Hansen et. al. 2011; Atmos. Chem. Phys. 11, 13421-13449. doi:10.5194/acp-11-13421-2011 https://arxiv.org/abs/1105.1140
(2) Altitude/pressure conversion: https://www.sensorsone.com/altitude-pressure-units-conversion/
(3) Tom Shula: A Novel Perspective on the Greenhouse Effect https://www.youtube.com/watch?v=NS55lXf4LZk
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@enderwiggin1113
"What you have checked yourself?"
<- Good point. Everything climate alarmists tell me about the climate is lie built on lie, model built on model. All of it carefully tuned to give the maximum catastrophe effect. None of their countless projections of doom and apocalypse ever materialize.
That sounds like fraud to me.
In contrast, I'll give Tom Shula the benefit of the doubt, for now. I'm eager to hear what more established skeptics have to say; such as Curry, Lindzen, Happer, Nikolov, Zeller, Stallinga, Soon, Connollys, Rex Fleming, Yong Zhong, Scafetta, ... If any proper scientists raise an issue I'll consider that.
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