Agree with Greg. If there is any net effect of this process at all (relative to the no-ice situation) then quantitatively it must be tiny tiny tiny.
If the alkalinity represented by the Ca2+ in the CaCO3 was in the surface ocean with no ice, that would tend to draw CO2 into the ocean. _______________ Ken Caldeira Carnegie Institution for Science Dept of Global Ecology 260 Panama Street, Stanford, CA 94305 USA +1 650 704 7212 [email protected] http://dge.stanford.edu/labs/caldeiralab https://twitter.com/KenCaldeira Assistant: Dawn Ross <[email protected]> On Wed, Sep 24, 2014 at 5:45 AM, Rau, Greg <[email protected]> wrote: > "A new study has revealed that Arctic Sea ice helps remove carbon > dioxide from the atmosphere and its depletion would result in an increase > of atmospheric concentration of the gas." [?!] > > How does removing CO2 from air increase air CO2 concentrations? Anyway, > can believe that CaCO3 precipitates and CO2 is generated as seawater > freezes and brine is formed: Ca(HCO3)2aq ---> CaCO3s + CO2g + H2O. But > whether the CO2 is then subducted with the sinking brine or degasses to the > atmosphere would seem critical to the air/ocean CO2 budget. That some > CaCO3s is entrained in the the ice seems logical, but how the preceding > reaction is reversed to consume this carbonate and CO2 is unclear. There > would need to be a way to concentrate CO2 to generate H2CO3 to then consume > the CaCO3s to (re)make Ca(HCO3)2aq. How does that happen? Anyway, if it > does happen this would seem to offer a new explanation for glacial/ > interglacial CO2 variations, not to mention a new method of modern day CDR > - bomb sea ice sheets with limestone particles. Beneficial "chemtrails on > ice" ;-) > Greg > > ------------------------------ > *From:* [email protected] [[email protected]] > on behalf of Andrew Lockley [[email protected]] > *Sent:* Tuesday, September 23, 2014 4:56 AM > *To:* geoengineering > *Subject:* [geo] Arctic sea ice depletion to result in rise of CO2 in > atmosphere | Zee News > > > http://zeenews.india.com/news/eco-news/arctic-sea-ice-depletion-to-result-in-rise-of-co2-in-atmosphere_1474406.html > > Arctic sea ice depletion to result in rise of CO2 in atmosphere Last > Updated: Tuesday, September 23, 2014 - 12:38 > > Washington: A new study has revealed that Arctic Sea ice helps remove > carbon dioxide from the atmosphere and its depletion would result in an > increase of atmospheric concentration of the gas. > > Dorte Haubjerg Sogaard, PhD Fellow, Nordic Center for Earth Evolution, > University of Southern Denmark and the Greenland Institute of Natural > Resources, Nuuk, said that if their results are representative, then sea > ice plays a greater role than expected, and we should take this into > account in future global CO2 budgets. > > The researchers said that they have long known that the Earth's oceans are > able to absorb huge amounts of CO2. But they also thought that this did not > apply to ocean areas covered by ice, because the ice was considered > impenetrable. However, this is not true, as the new research shows that sea > ice in the Arctic draws large amounts of CO2 from the atmosphere into the > ocean. > > Sogaard said that the chemical removal of CO2 in sea ice occurs in two > phases. First crystals of calcium carbonate are formed in sea ice in > winter. During this formation CO2 splits off and is dissolved in a heavy > cold brine, which gets squeezed out of the ice and sinks into the deeper > parts of the ocean. Calcium carbonate cannot move as freely as CO2 and > therefore it stays in the sea ice. In summer, when the sea ice melts, > calcium carbonate dissolves, and CO2 is needed for this process. Thus, CO2 > gets drawn from the atmosphere into the ocean -and therefore CO2 gets > removed from the atmosphere. > > ANI > > -- > You received this message because you are subscribed to the Google Groups > "geoengineering" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/geoengineering. > For more options, visit https://groups.google.com/d/optout. > > -- > You received this message because you are subscribed to the Google Groups > "geoengineering" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/geoengineering. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/geoengineering. For more options, visit https://groups.google.com/d/optout.
