We will probably change this at some point to more realistically cover the in-between states and expose what's going on. So any time you add a random rocky planet, when it crosses an arbitrary atmosphere mass threshold it will stop paying attention to the Infrared Emissivity value, and start behaving more like Venus. So we use an equation for an optically-thick dry troposphere runaway greenhouse limit, which depends on other parameters and is calibrated for Venus. You would need an infrared emissivity much greater than 1, which doesn't really make sense. The trouble is that this conceptualization does not work for very thick atmospheres like Venus. Usually for rocky planets we use a single layer atmosphere with an infrared emissivity, as referred to in the third item of the FAQ. In answer to the question, you have indeed observed a discontinuity in the way we calculate temperature for very thick atmospheres. It clearly implements some aspects like the Stefan–Boltzmann law and non-ideal body properties for absorbance and emission, but some of the numerical results like those dramatic shifts don't make much sense to me. I guess my question boils down to what the mathematical model of the surface temperature is right now. I have doubts that such a dramatic shift around that transition really fits well with reality and expectations of game mechanics. The more predictable rise with significantly more mass makes sense, but that already sits well with me. Depending on the parameters for albedo and IR emissivity, I've seen shifts in the greenhouse effect as large as starting at +50 K and crash to near 0 K when crossing over that point (~1% increase) in atmospheric mass. In particular, the changes in atmospheric mass around that critical ratio can cause dramatic shifts in the temperature rise due to the greenhouse effect (or at least what is called such in the program). My question relates to reconciling what I see in the game with reality. What you said makes sense in regards to reality and physical models. Also while (visible) light is escaping the planet it's wavelength slightly shifts towards red and eventually infrared, contributing to the effect because visible light is also reflected and hence bounces as well, shifting a little towards red each time it goes "up". With a thick layer of atmosphere containing reflective stuff the IR light of both sources will hit the surface more often, bouncing between surface and greenhouse contributors. Infrared Emissivity mostly refers to your planet cooling down and not so much to reflecting light of IR wavelength. Below that ratio, gases would simply escape. Pressure and gravity are working against each other and it's only at and above a certain M atmosphere / M planet ratio that gravity gets the upper hand. For the same reason the pressure will go up with more atmosphere mass. The more massive a planet is the more atmosphere it takes to get the atmosphere reach higher above the surface, because of gravity. its kinda long, so i will stop it here.Scale Height is playing a big role once the atmosphere passes a certain mass relative to the planet's mass. Uv light: uv light can strip away atmospheres and that. Gas giants and stars use these elements to heat up on their own. Plants are needed for other life forms (the food chain).Ītmospheres with flammable elements will become more red in collisions, this will increase temperature, and cause O2 to become Co2 (if there are plants). Life: plants make Co2 become O2, making more plants. makes new elementsĬities: cities will become more clean over time, once a city has industrialised, it may produce Co2, whether it becomes runaway greenhouse effect depends on the civilisation.Ĭities with low cleanliness will cut down more trees (this causes more Co2.) 2parts hydrogen, 1 part O will cause water (through heat and stuff). Ozone protects from UV light and other things. Hydrogen can be made into helium, which does nothing except float away in heavy atmosphere (unless nuclear forces happen)Ĭo2 is an element cities can make (city details later).Ĭo2 heats up a planet by trapping heat, until the heat cools down, then it will cause the planet to go cold. if the sea level cup is full, the object cannot even absorb any more water or hydrogen. if sea level is at max elevation, there is no room for atmosphere. Hydrogen is very flammable, making more fire. sea level then functions as a 'cup.' atmosphere is restricted to sea level to max elevation, also a cup. Hydrogen is light, and likes to escape with heavy atmospheres. Oxygen is a major factor in earth, but it can be decided if it is needed for life. Oxygen is made with life, if there is co2, if an object collides with a planet, the amount of oxygen is a factor in how much fire there will be (red shockwave thing).
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