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Pajaholic
Joined: 11 Apr 2009
Posts: 39
Location: Cornwall, UK
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 Posted: 06 May 2009 06:34 am Post subject: |
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| hqmonaro wrote: | | But we are doubling (or more) the CO2 content. The CO2 issue was not raised by me, but by someone else, I just resonded to them. |
 I still don't see what this has to do with the albedo of water. However:
Since temperature rise from greenhouse gas forcing is a logarithmic function of greenhouse gas concentration, it makes sense to calculate climate sensitivity in terms of doubling as this is an easy-to-understand logarithmic unit. That said, Segalstad has calculated there to be insufficient fossil fuel resource (as opposed to reserve) to raise the CO2 concentration by more than 20%. So although we might talk in terms of doubling, we cannot actually get close to that - even if we burn every scrap of fossil fuel on the planet.
p/. |
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Richard111
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Joined: 19 Sep 2008
Posts: 433
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| Posted: 16 May 2009 06:43 am Post subject: |
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Pajaholic - you might find this page of interest:
Anomalous properties of water
It makes my head hurt, but there is a LOT of information about water on this site. |
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Pajaholic
Joined: 11 Apr 2009
Posts: 39
Location: Cornwall, UK
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| Posted: 16 May 2009 04:32 pm Post subject: |
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Thanks for that. FWIW, I've got a lot of info from the London South Bank University site - they have an excellent page on the absorption properties of water in all three states. That page got me into thinking about the albedos of liquid water and ice, which thus was the catalyst behind this thread. That said, I hadn't previously seen the page you linked. So again thanks.
p/. |
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Richard111
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Joined: 19 Sep 2008
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| Posted: 18 May 2009 05:19 pm Post subject: |
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Pajaholic - I couldn't find the page you refer to on the LSBU site. 
Could you post the link please. |
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Pajaholic
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Location: Cornwall, UK
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Richard111
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Joined: 19 Sep 2008
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| Posted: 19 May 2009 12:44 pm Post subject: |
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Oops.. That is the same site I posted in my comment on the 16th.
I went to the University site which only offered course registration. 
Professor Martin Chaplin's web pages are mind blowing with data. Did you see the water absorbance graph?
The visible and UV spectra of liquid water.
Couldn't find a link to the graph but it is 3/4 down the page I linked above.
Have seen the contents page thanks, but so far not found any info on IR penetration and heating of water at different wavelengths. |
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Pajaholic
Joined: 11 Apr 2009
Posts: 39
Location: Cornwall, UK
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| Posted: 19 May 2009 01:04 pm Post subject: |
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| Richard111 wrote: | Professor Martin Chaplin's web pages are mind blowing with data. Did you see the water absorbance graph?
The visible and UV spectra of liquid water.
Couldn't find a link to the graph but it is 3/4 down the page I linked above. |
Do you mean this one?:
If so, it's a bit more than claimed since it shows not only UV and visible light but also into the IR. It also gives a nice demonstration of why water is blue in colour and also how different is its opacity in the visible light region compared with just about anywhere else in the EM spectrum.
However, the graph that got me interested is the one above that - the one that shows the spectra for the same quantity of solid, liquid, and gas:
Note that the energy that can be stored by absorption is proportional to the area under each curve.
| Richard111 wrote: | | Have seen the contents page thanks, but so far not found any info on IR penetration and heating of water at different wavelengths. |
I suspect you should be able to calculate this from the info on the page I linked. Look at the formulae for absorbance and transmittance near the bottom of the page in footnote d.
p/. |
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