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View Diary: CO2 edges above 400 ppm (151 comments)

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  •  At some point (13+ / 0-)

    ---some specific moment in time---CO2 concentrations will begin to affect photosynthesis by "tricking" plant stomatae into abnormal closure, thus reducing photosynthesis-centric respiration of the plant.  This reduces the amounts of both CO2 absorption and oxygen emission. This uptick hasn't been factored into the overall equation.  Likewise, no one has really crunched the hard numbers on permafrost thawing.  We've talked a good story on methane, but how much ground-sequestered CO2 will accompany it?  No one seems to have examined that number yet, either. Thirdly, there are no solid models to equate whether oceanic acidification will inhibit carbon sequestration, or invoke atmospheric acidification.  If an ocean's water can be acidified, then atmospheric water molecules can also be acidified---hence "acid rain."

    All of these factors can, and probably will, cause a very-measurable uptick in atmospheric CO2 levels.

    Proponents of gun violence own guns. Opponents of gun violence do not own guns. What part of this do you not understand?

    by Liberal Panzer on Thu Apr 25, 2013 at 10:58:39 AM PDT

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    •  Conflating ocean acidification and acid (2+ / 0-)
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      6412093, mystique mist

      rain seems like a huge stretch to me.

      But if you provide some links about that, I'd be intrigued to find out more.

      In any event, the ocean is freakin' huge, and can "safely" accommodate huge amounts of CO2 - with safely meaning no chance of catastrophic outgassing as seen in those African lakes a couple of decades ago.

      But still, ocean acidification is slowly killing certain types of plankton that depend on calcified exoskeletons.  That's the real threat.

    •  The pH or acidity of rain (1+ / 0-)
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      Mindful Nature

      Carbon dioxide is a weak acid.  The pH of rain only drops to very low values when strong acids, primarily sulphuric and nitric acid from smelting or coal burning, are present in the atmosphere.  Even as CO2 increasing to higher and higher concentrations in the atmosphere the pH of rain water, in the absence of other acids, will only drop to 4-5.

      by MarineChemist on Thu Apr 25, 2013 at 01:36:54 PM PDT

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