Saturday, January 26, 2013

Mineral dust sprinkled in oceans could absorb vast amounts of carbon: study

10:20 AM | Posted by Free Game Zone | | Edit Post

geoengineering method could reduce emissions, but requires a huge effort and mining change the balance of the ocean

billion tons of mineral powder spray over the oceans could quickly remove large amounts of carbon dioxide to global warming, according to a new study.

The proposed "geo-engineering" technique also offset ocean acidification and can be directed to coral reefs endangered, but would require an effort on mining large-scale coal in the world and alter the biology of the oceans.

"is certainly not a simple solution to the problem of global warming," said Peter K?hler, at the Alfred Wegener Institute for Polar and Marine Research in Bremerhaven, Germany, who led the study. It would take 100 large vessels operating throughout the year to distribute tons of mineral olivine 1BN, although it may be possible to use water ballast in the existing transport instead.

geoengineering

- global intervention in the fight against climate change - is a controversial idea because of the risk of unintended consequences globally. But scientists say it should be studied in the case of international efforts to reduce emissions of greenhouse gases from human activities can not avoid radical changes in weather and emergency measures.

Dissolve mineral dust in the ocean makes sea water more alkaline and capable of absorbing more carbon dioxide from the atmosphere. Olivine is attractive because it dissolve in a year or two - almost instantaneous delivery of carbon reductions - and is present beneath the surface of the Earth around the world. K?hler research, published in Environmental Research Letters, found that three billion tons of olivine spray eliminate nearly 10% of carbon emissions from anthropogenic sources in the atmosphere.
  • More than 10% is absorbed by the oceans, but the energy required for grinding and mineral dust transport result in carbon emissions. Up to a third of what would be absorbed by the oceans if coal plants are the source of electricity. The mineral must be ground to a size of 1 micron to avoid sinking to the bottom of the ocean before it dissolves.
  • Oceans and dissolve
  • billion tons of silicate minerals flowing into the ocean sediments transported by rivers. Adding more silicate alter plankton growing in the oceans, said K?hler. "Silicate is a limiting nutrient for diatoms, a specific type of phytoplankton. Added silicate alter the species composition of phytoplankton diatoms inside."
use powder mineral geoengineering could have some advantages over the main type of alternative, injecting sulfate particles into the atmosphere to block sunlight. "Thanks to atmospheric geoengineering, once you start, you must go. Let this be a dramatic increase of the heating of a magnitude not know if emisisons not been reduced carbon, "said K?hler.

Instead of temporarily block the sun's heat, the approach eliminates the mineral powder carbon dioxide from the atmosphere, then stop spraying dust not only mean more carbon was removed. It also helps reduce ocean acidification, K?hler.



But he said it would be very difficult to conclude international agreements necessary to begin spraying the dust, even if it was proven safe and could be financed.
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