Meteorology  radiative equilibrium timescaleby Sojourner01 Tags: equilibrium, meteorology, radiative, timescale 

#1
May707, 03:21 PM

P: 373

1. The problem statement, all variables and given/known data
Derive the radiative timescale for an atmosphere: [tex] \tau_{E} = \frac{c_{p} p_{0}}{4 g \sigma T^{3}_{E}} [/tex] 2. Relevant equations As above 3. The attempt at a solution I've gathered that the difference between the radiative power of an object, [tex] \sigma (T + \Delta T)^{4} [/tex] And the incoming solar flux on the object, [tex](1  \sigma) S[/tex], is equal to an instantaneous rate of change of heat, [tex]\frac{dQ}{dt}[/tex]. I don't know how to proceed from here; my derivation of the answer doesn't appear to conform to the one above. edit: oh for crying out loud, I hate TeX. It never does what I want it to, and I have the 'how to program tex' thread open here in front of me. You can see what I was trying to achieve. 



#2
May907, 04:16 PM

P: 373

Well, I've sorted it out in case anyone is interested. Turns out you can factor out the bracket [tex](T + \Delta T)^{4}[/tex] as [tex]T^{4}(1 + \frac{4 \Delta T}{T})[/tex] using the first order binomial expansion.
Silly method, but there we go. 


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