What is the Greenhouse Effect?
Is there a glass dome over the earth?
- DiracLv 46 months agoFavorite Answer
Over the long term, the Earth system is in radiative equilibrium with the radiation from the sun that is not reflected.Let's assume there are no greenhouse gases in the atmosphere (or no atmosphere at all). Then the energy absorbed the surface of the Earth will equal the amount radiated away from the Earth has a blackbody. If this is not true, then either would warm up or cool down--it would not be in equilibrium.
Now imagine there is something in the atmosphere that absorbs some of the radiation coming from the Earth's surface. It will also radiate, based on its temperature as a blackbody. Some will go out toward space, and some goes back down toward the Earth. There is now MORE energy striking the Earth's surface than there was before--not only is there the sunlight, but also this downward radiation directed radiation from the atmosphere. If it is to remain it equilibrium, it must radiate more. If its blackbody properties haven't changed, the only way for it to radiate more is to be at a HIGHER temperature. That is the essence of the greenhouse effect. The Earth still has to be in radiative equilibrium with the incoming sunlight, but now the outward radiation to space is not just from the surface, but also from the atmosphere. Essentially what has happened is that the level of radiative equilbrium has shifted upward, away from the surface.
Contrary to what Solar Wind implies, this does not violate either the first or second laws of thermodynamics. Simple accounting at every level shows that the first law is not violated. The second law is not violated because the net flow of energy (heat or thermal energy) is from the warmer surface to cooler atmosphere, exactly as it should be.
- 6 months ago
It's when we don't *laughs* Yes we are in a glass dome yes that's true.
- antarcticiceLv 76 months ago
Watching deners produce claims and theories that greenhouse theory can’t work, is one of the funnier things they do, sadly they just don’t seem to grasp how much their absurd theories demonstrate how they don’t really understand even basic science. The actual basic experiments demstrating the greenhouse effect are now well over a century, and referencing fake science from obscure Mexican scientists has (outside the faithful of the denier set) had no real effect on any aspect of the genuine science.
- Anonymous6 months ago
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- J.R.Lv 46 months ago
`Even Elizabeth says there is a bot here:
- ElizabethLv 76 months ago
You put a saucepan of water on a gas stove and turn it low. The water heats up until it hits maybe 80 degrees C. You are supplying heat to the saucepan at a certain rate. The saucepan and water loses heat to the surroundings. When the rate of supply is higher than the rate of loss, the water warms. When the rate of loss exceeds the rate of supply, it cools. Constant temperature is achieved when the two balance.
To get the water to boil you have to do one or both of two things ... increase the supply rate (turn up the gas) and/or reduce the loss rate (put a lid over the water).
The earth receives heat from the sun. The earth radiates heat into space. The planet is at a constant average temperature when the rates balance. By pumping CO2 into the atmosphere we reduce heat loss into space because those molecules redirect some of that energy back towards the earth. The planet has to warm. It would settle at a new higher temperature, but we keep adding more CO2 ...
- $@!ar W!ndLv 66 months ago
The Greenhouse Effect is a man made theory that defies the Laws of Physics, it is fiction.
Climate alarmism is based, of course, upon its alternative conception of a greenhouse effect from that of an actual real greenhouse. A real greenhouse is warmed by the sun and remains warmer inside than outside because it physically traps warmed-air inside, whereas outside that air warmed in contact with the sunlight-heated surface is immediately diluted with cooler air from the entire atmosphere. Inside a greenhouse there is trapped a much, much smaller quantity of air than the entire atmosphere, and so this air trapped inside can be warmed quickly to the temperature at which it is being heated from sunlight, which is typically fifty degrees Celsius and higher.
The climate alarmist alternative greenhouse theory, however, is based upon sunlight not being able to heat anything to a temperature above minus eighteen degrees Celsius. Climate alarmism begins with this position because they treat the Earth as flat. Yes, it is actually flat Earth theory. From there the theory develops a scheme where the radiation passively amplifies itself to a higher temperature.
In any case, aside from these existing fatal flaws which already make the postulate of an alarming climate pseudoscientific, let us consider the First Law of Thermodynamics:
1. ΔU = W + Q
ΔU is the change in internal energy of a system, and W and Q are the work (W ) performed upon and heat (Q) sent to the system. And so that is:
In order to increase a system’s internal energy, i.e. to increase its temperature, it must have work performed upon it and/or heat sent to it.
Thermal radiation from the atmosphere satisfies neither of those requirements in order that the atmosphere may behave as a temperature-increasing function for the surface of the Earth: thermal radiation from the atmosphere is not performing any work on the surface, and nor does the cooler atmosphere have any heat to send to the warmer surface since heat can only be sent from a warmer object to a cooler one.
Thus it is all extremely simple: there is no mechanism, in thermodynamic law, that the cooler atmosphere could cause the warmer surface to increase in temperature. Look at equation 1: this is algebra for 5 year old’s. It is so, so simple.
There are no heat (Q) sources other than the Sun and sunlight (aside from the negligible geothermal heat making to to the surface).
However, the atmosphere does have a temperature gradient where the gas is warmest at the bottom of the atmosphere, coolest at the top (of the troposphere, where Ideal laws apply), and the average temperature is, of course, in the middle.
And so, since there are no other heat sources around, what is the only possible thing left which can perform work upon the atmosphere in order to affect its energy and temperature?
The only phenomenon left is gravity. And we already know the physics of how this works, and how to derive the effects, and what is derived is likewise empirically confirmed. Thus there’s neither need nor room for any alternative and/or additional phenomenon, such as an alarming radiative greenhouse effect, in order to explain the temperature distribution of the troposphere.
This is precisely what Nikolov and Zeller found in their independent research.
The thermal radiation from the cool atmosphere has no heat to send to and performs no work upon the warmer ground surface. Therefore, there is no alarming radiative greenhouse effect. The First Law of Thermodynamics refutes political climate alarmism.
Furthermore, only gravity can perform work upon the atmosphere, and this explains the temperature gradient of the atmosphere with theory matching observations, and this leaves no room for any additional influence from a supposed radiative greenhouse effect notwithstanding that said effect is not supported by theory in any case.Source(s): Taken from peer reviewed scientific papers.
- LônLv 76 months ago
The basic physics of the greenhouse effect is simple. Greenhouse gases, such as CO2. allow short wave radiation from the Sun to pass through and block some of the longer wave radiation from the Earth from escaping into space. Without the greenhouse effect, the Earth would not be able to support life because it's temperature would be below freezing. However, since humans started to burn fossil fuels, the atmospheric concentration of CO2 has been increasing, causing the Earth to warm. This may effect weather in unpredictable ways, such as more storms and droughts and it is causing the ice in the Arctic to melt at a rapid rate. If this is not stopped, sea levels may rise, causing millions of people to lose their homes.