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Viewing Single Post From: The giant space ship example
gbaikie

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As for your reasons for putting the dwarf planet at 10C... you cannot presume a 33K greenhouse effect unless dwarf is a MUCH closer match to Earth. That would mean moist adiabiats, wide surface variation, diurnal cycles, many greenhouse gases all with different absorption spectra, and so on, and so on... way beyond what I can calculate for myself with a simple spreadsheet, or anything else for that matter!

So I'll be able to calculate a greenhouse effect in the simple case of Dwarf; but it's not going to be the same number as the 33K we get for Earth."


Ah. I didn't know that.
I was thinking that sunlight would have cooling affect [strange as that seems]. It seems in comparison the sun heat the earth rapidly. Such rapid warming and cooling would result in more mixed atmosphere. And I would think a quieter atmosphere could get warmer.



If you violated the lapse rate dumping large amount of heat in a localized area, would not result be radiating more heat into space. And doesn't the opposite- a calm atmosphere allow it to get warmer?
It also seems since that dwarf planet has more atmosphere per sq meter column of air any greenhouse gas could result in more heating. If you have 400 ppm of CO2, one has 3 times the amount per square meter than earth.
With H2O you could more humidity per square meter because lower lapse rate- though because of lower temperature the air can't hold as much as warmer earth, but has a higher density of air- it's only pressure which is 1/2 of Earth. So comparing same temperature, one should also get about 3 times the amount water which air could hold.

Edit Maybe better to switch pressure 1/10th of earth, and then dwarf as same amount of atmosphere per square meter and have same air density as earth.
Less differences, less potential confusion.
And gets 8 hours for cooling 1 C rather than 24 hrs. And considering difference in lapse rate- having larger chunk of air at same temperature- come to think about it's not vaguely unreasonable.
Plus at 1/10th pressure, the sky isn't so high.
If do that, remember to change numbers on chart
Only reason for 1/3rd of earth atmosphere was so it's breathable without pressure suit- and I had thought had heat capacity or density of atmosphere would reduce heat loss.
Oh, I guess it wouldn't same density but it would more similar.

Edited by gbaikie, Dec 10 2011, 11:14 AM.
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The giant space ship example · Physical theory for climate