All CO2 molecules in the photons path have the potential to absorb this photon. It seems that direct heat from the sun feels significantly warmer on my skin than the 33C ambient temperature of our test day. Atomic gases such as the noble gases have no dipole moment and hence no greenhouse properties. ( We are just 9 or 10 degrees ( 3% ) warmer than a flat spectrum ball in our orbit . ) CO2 – An Insignificant Trace Gas? c) The rate of change in pressure with altitude changes as carbon dioxide is replace by nitrogen. “If Venus had the same albedo as the earth, the energy absorbed per m² of surface area would be, E = 2,636 * (1-0.3) / 4 = 941 W/m².”. And I didn’t realize that spectralcalc would let you change pressure to see the results in the absorption spectrum – which page in spectralcalc are you going to? — Rob Honeycutt (@robhon_) December 20, 2019. Planetary atmosphere remember. Venus is closer to the Sun, and gets proportionally more power from it. Thirdly. Here, I want to focus initially only on the empirical temperature study, the “paper-within-the-paper” as I referred to it in my first post. (7.15) . Thanks for your reply and the citations, all of which I have studied. It’s not worth my time to point out all the errors. What’s being claimed is something like that spherical shell contains another sphere and that the outer sphere reflects 76% and is transparent for 24% of radiation with wavelengths less than 4 micrometers and absorbent for wavelengths greater than 4 micrometers. In the atmospheric window at 8-12 mm,the atmosphere is only weakly absorbing except for the O3 feature at 9.6 mm. Hang on, isn’t the 158w/m2 the external radiation from the sun which reaches the surface and the 160w/m2 which leaves from TOA; they’re balanced so the 16000 w/m2 can heat the surface and the atmosphere? We see from the above discussion how terrestrial emission spectra measured from space can be used to retrieve information on the temperature of the Earth's surface as well as on the thermal structure and composition of the atmosphere. Calculate the value of the 'solar constant' on Mercury, Jupiter? I took 590 W/m^2 and divided it by 4 (the shape of the planet is a sphere) then took in to account the albedo of 22 %. In these models, a radiative perturbation associated with increase in a greenhouse gas (radiative forcing) triggers an initial warming; complex responses follow involving for example enhanced evaporation of water vapor from the ocean (a positive feedback, since water is a greenhouse gas), changes in cloud cover, and changes in the atmospheric or oceanic circulation. The solar radiation flux FS at that distance is distributed uniformly over the sphere centered at the Sun and of radius d ( The net transmitted radiation is only a fraction of a watt, at most, near the ground, and only becomes significant at higher altitudes where the CO2 density is much lower. One point I left out, assume the surface has a black body emissivity for the long wave outgoing radiation. , we obtain a relationship between DTo and DF: where l is the More heat is lost by radiation to space at any given altitude in the troposphere than is absorbed from radiation from below. According to Newton’s law of universal gravitation, the planet would act as a gravitational force (F g) to its orbiting moon. If calculation using 99.99 percent Argon and 0.01 percent CO2 give a MUCH lower surface temperature, I would be convinced that I may be wrong. – by radiation to the surface – sigma x T^4 Marty Hertzberg comes to the same approximately 279k value for a flat spectrum earth , leaving about a 9k deficit , that I do . Its dissapointing to find that the equation is so nonlinear near Et=1 that no useful info can be had for the Venus case. For example, with 3 totally opaque layers the solution to a similar set of equations (with 4 equations and 4 unknowns) is: It should be easy to see how the surface temperature gets extremely hot from radiation with many layers of opaque atmosphere (yet transparent to solar radiation). Conduction is another fifth, and Evaporated Water is by far the most important. i.e., the greenhouse gas sets the temperature for equilibrium to space to near the TOP of the lapse rate location. Where is this mechanism if the surface is not already heated by the “greenhouse” effect? And Earth’s surface temperature if we removed all non-greenhouse gases from the atmosphere (leaving only the ~ 0.5% trace gas concentrations – ie. Replacing Then I realised that Fig. (7.12) The back-radiation from the “greenhouse” effect creates the conditions for convection. Look up the Schwartzchild equation. Now assume the gas temperature and distribution are initially different from present levels, but no gases are condensed other than those that form the present clouds. The radiative forcing caused by a change Dm in the atmospheric mass of a greenhouse gas X is defined as the resulting flux imbalance in the radiative budget for the Earth system. Scenario 1: But once we add multiple layers we are effectively dividing up the real atmosphere and saying that each layer is totally opaque. I was playing around with MODTRAN to see how low I needed to go on CO2 concentration to get the very low emission that Nasif calculates (~0.1 W/m2). In the absence of absorption/radiation by the atmosphere, conduction would dominate and the atmosphere would be nearly isothermal.”. . If one could make the atmosphere infinitely viscous so no convection could occur, the lapse rate would increase to greater than the adiabatic rate. An increase in the internal energy is achieved by transition to a higher state. The question for Venus with 100% CO2 would be, is there a limit to CO2 heating with a constant pressure?

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