Re: OT: Post Turtle

On Jun 24, 11:19 am, John Larkin
<jjlar...@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
On Tue, 24 Jun 2008 09:47:47 -0700, Jim Thompson





<To-Email-Use-The-Envelope-I...@xxxxxxxxxxxxxxx> wrote:
On Tue, 24 Jun 2008 09:27:44 -0700, John Larkin
<jjlar...@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:

On Mon, 23 Jun 2008 19:20:12 -0700 (PDT), MooseFET
<kensm...@xxxxxxxxx> wrote:

On Jun 18, 7:48 pm, John Larkin
<jjlar...@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
On Wed, 18 Jun 2008 18:55:25 -0700 (PDT), MooseFET

<kensm...@xxxxxxxxx> wrote:
On Jun 18, 5:49 pm, bill.slo...@xxxxxxxx wrote:
[....]
Richard Henry's crack about "physics for poets" is not unjustified -
John Larkin has posted the claim that "pressure broadening" is insane,
whereas it is - in fact - a perfectly obvious feature of the infra-red
absorbtion spectra of specific gases. You put a given pressure of a
specific gas (such as carbon dioxide) in a long path infra-red
absorbtion cell, measure the spectrum, then add a whole lot more of a
gas that doesn't absorb in the infra-red (like oxygen or nitrogen) and
measure the spectrum again, and you find that the absorbtion lines are
broader.

They also shift their centers.  This is the reason for the magic
mixture in the cells of atomic clocks.

Sure. But what's the connection to global warming?

If you want to figure out how much IR is blocked, you need to look at
where the lines are as well as how wide they are.  When the overlap,
their effects no longer simply add.

John

That's a separate issue. It's like cascading filters, electrical or
optical, a linear effect as far as I know. The issue here is whether
adding CO2 to the atmosphere has much effect, through pressure
broadening, on absorption by other gasses. Nobody here seems to know.

I was accused of being ignorant because I didn't know, so I suppose
that makes us all ignorant. That hasn't stopped people from lecturing
me.

John

You lack an elitist PhD, John.  So you're supposed to go sit in the
corner and shut up.

I haven't seen any three-year-out climate predictions yet.  Have you
?:-)

                                       ...Jim Thompson

I never had time for grad school. I was so busy designing stuff I
barely managed to finish my BSEE.

I've seen predictions of a 10-year cooling trend.

http://www.shns.com/shns/g_index2.cfm?action=detail&pk=MURDOCK-05-01-08

I've seen claims of a cooling trend over the last 10 years, but no one
has been able to provide the data to back it up.

.

Relevant Pages

  • Re: OT: Post Turtle
    ... John Larkin has posted the claim that "pressure broadening" is insane, ... absorbtion spectra of specific gases. ... molecules, and interact more strongly than non-polar molecules like O2 ...
    (sci.electronics.design)
  • Re: OT: Post Turtle
    ... John Larkin has posted the claim that "pressure broadening" is insane, ... absorbtion spectra of specific gases. ... John. ...
    (sci.electronics.design)
  • Re: OT: Post Turtle
    ... John Larkin has posted the claim that "pressure broadening" is insane, ... absorbtion spectra of specific gases. ...
    (sci.electronics.design)
  • Re: OT: Post Turtle
    ... John Larkin has posted the claim that "pressure broadening" is insane, ... absorbtion spectra of specific gases. ...
    (sci.electronics.design)
  • Re: OT: Post Turtle
    ... John Larkin has posted the claim that "pressure broadening" is insane, ... absorbtion spectra of specific gases. ...
    (sci.electronics.design)