In my reading, the wording was very confusing. Reading more carefully, it seemed to me that they were saying that there will be less CO2 in the ocean as a result of melting back of the sea ice. An open Arctic with no sea ice formation would imply less down-welling due to not forming dense brine pockets, so one mechanism would be a consequence of that, and another might be due to the greater stability of the ocean in the warm season. I did not read the paper, but, once I got past some unclear wording, the sign sort of made sense.
Mike On 9/23/14 1:52 PM, "Ken Caldeira" <[email protected]> wrote: > 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.
