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Subject: Re: Floating atmospheric regulators
From: [log in to unmask]
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Date:Fri, 22 Jun 2007 12:47:43 +0700
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 There is a nice readable summary of theses issues (carbon uptake and
release by ocean waters and organisms, and the effect of this on climate)
starting on the following web page:

http://earthguide.ucsd.edu/virtualmuseum/climatechange1/06_1.shtml

Obviously there is lots of information on this, but this site is a
reasonable summary. 

I don't think there is one simple statement that will answer the question as
to how we might increase up take of CO2 without causing some undesired
effects.   But it is certainly an interesting and well studied area.  

Note that some plankton blooms will release carbon into the atmosphere:

"Let us remember at least one element concerning the carbonate cycle:
Unusually intense blooms of carbonate-fixing plankton, like
coccolithophores, would have the effect of bringing carbon dioxide from
surface waters to the air above it -- that is, increasing the atmospheric
CO2 concentration. The same is true for coral and shell growth in shallow
waters. " -- from the above web site.



Richard

____________________________
 
       Richard G. Dudley
       please reply to: [log in to unmask]
 
http://pws.prserv.net/RGDudley/



-----Original Message-----
From: Scientific forum on fish and fisheries
[mailto:[log in to unmask]] On Behalf Of Trevor J. Kenchington
Sent: Friday, June 22, 2007 7:06 AM
To: [log in to unmask]
Subject: Re: Floating atmospheric regulators

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PtP,

Why would you want to focus on the surface of the ocean, meaning perhaps the
top 10mm, when you could promote production in the entire euphotic zone,
extending down to maybe 100m depth? With 10,000 times the water volume
available, you would likely get more benefit for your efforts that way.

Also, UV light has nasty effects on living tissue (as my sunburnt back is
telling me after a rare clear day here). But UV doesn't penetrate far into
seawater, so most marine organisms have not evolved ways to cope with it. By
focusing on surface-dwelling neuston, you would be closing the door to most
of the plants that could take up the excess carbon.

Then again, when a plant dies at the surface, its carbon is that much the
more likely to return to the atmosphere, which is not what you are after.


All in all, a focus on the ocean surface seems misguided for one pursuing
your objectives.


Trevor Kenchington



You wrote:

> Further to our previous discussion on atmospheric carbon absorption by 
> phytoplankton then (eg the "Planktos" work as covered by Discovery TV 
> recently) would it not be best to focus on just the surface ecosystem? 
> Lily pads float on the surface and absorb carbon. There must be other 
> living creatures which do the same and maybe therein lies an effective 
> carbon absorber which could be cultivated in various waters by 
> "mineralizing" them as the Planktos ship will do.
>
> PtP

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