SwansonT, studiot, and joigus, thank you for your responses. I studied all of the references you suggested, but unfortunately, the mathematical equations were beyond my comprehension. I was left with just general impressions.
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SwansonT, my minor problem in response to a question by studiot, wasn’t an understanding of the 15 degrees C and the -18 degrees C, but the reference to how the -18 degrees C was calculated. You at least gave me a source for that. and I thank you accordingly. I can understand that our atmosphere discharges some heat energy into space and that this probably conforms to some extent to the SB Law.
This student is dumber than you imagine, and can only understand the very basics.
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studiot may have provided a better understanding for me concerning the role of SBL principles within our atmospheric dynamics. He points out that “There are two coefficients called emissivity and absorbitivity which relate to energy in the general case and heat in a particular case...... All bodies are in a state of both continual emission and continual absorbtion.” He suggests that a grey body is an imperfect black body; i.e., a physical object that partially absorbs or emits incident electromagnetic radiation.
So, in one sense he seems to be suggesting that the SBL is not restricted to ideal black bodies and that virtually every body at molecular or macro- level can be regarded as an emitter or absorber to some extent, depending on temperature and other factors.
Now I may have totally misunderstood studiot, and misquoted him, but it is becoming obvious to me that I’m not going to be able to satisfy my curiosity about climate science matters by persisting in this thread.
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joigus spoke about ‘periodicity’ or lack of it, being the aspect that I’m missing in the whole picture. To some extent he re-inforces studiot’s notion when he states “Indeed, the Earth is not a black body, but you can rest assured that the part of the radiation spectrum from any physical body that contains thermal information about that body (that is, excludes reflected light, or light that goes through it) nicely fits that of a black body. A black body does not reflect any light, that way you get to the part of radiation from anything made of atoms that's only due to radiation having been in thermal equilibrium (or bouncing around long enough inside the body) and then started to re-radiate those photons. Most of the light you receive from a rock that's sitting on your desk is reflected light. Certainly the one in the visible frequencies is (at room temperature). But if you were sensitive enough to see the infrared, you would see a frequency-dependent graph that agrees with the black-body spectrum.”
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My thinking about climate change commences basically with my own mental images initially of temperature-recording devices in Stevenson Screens on land, in ships and buoys, and in satellites. I picture the gases in the atmosphere around the land and sea becoming active due to absorbed energy at the molecular level and transmitting emitted energy to the temperature sensors. To my mind, that is what climate change is all about. If the average global annual temperatures weren’t rising due to increasing energy fluxes at the temperature-sensing device mechanisms, there would be no problems associated with ‘climate change”.
I can understand the science of how the the energy reaching the surface from the sun and radiative forcing appears to be calculated as a global average at about 156 Wm-2, and how this results in a change in the Earth’s near surface annual average temperature from 255 K to 288. If it’s mathematically incorrect to equate that 33 degrees K with the 156 Wm-2 affecting the atmosphere near the temperature-recording devices, my question would be whether there’s a more complicated mathematical connection, or is it an indirect association. I’ve not received an answer that I can comprehend.
I’m unable to glean that from the answers I’ve received, so my curiosity has turned to confusion.
I’ve concluded that I can’t learn any more in this forum about the basics. I concede that the reason is most probably my own inability to comprehend the mathematical equations used in the science you’ve all provided but I thank you for your efforts.
I’ve decided to retire from this thread because of my own inability to comprehend the responses you have all made in an effort to satisfy my curiosity.
I repeat that I thank you all for your efforts..