"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: geoengineering@googlegroups.com [geoengineering@googlegroups.com] on behalf of Andrew Lockley [andrew.lock...@gmail.com] 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 geoengineering+unsubscr...@googlegroups.com<mailto:geoengineering+unsubscr...@googlegroups.com>. To post to this group, send email to geoengineering@googlegroups.com<mailto:geoengineering@googlegroups.com>. 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 geoengineering+unsubscr...@googlegroups.com. To post to this group, send email to geoengineering@googlegroups.com. Visit this group at http://groups.google.com/group/geoengineering. For more options, visit https://groups.google.com/d/optout.
