Research press release


Nature Geoscience

Sinking carbon



全球海洋生物化学モデルを用いてE Y Kwonらは、有機炭素がCO2へと再鉱化する深さが増加するにつれて、底層水へ注入されるCO2量も増加することを示した。全体としては大気へ逃げていくCO2量が減少するので、大気中のCO2濃度が減少することになる。


The amount of carbon dioxide removed from the atmosphere and stored in the oceans depends, in part, on the depth to which marine organic carbon sinks, according to a study published online in Nature Geoscience.

Marine organisms such as phytoplankton take up CO2 from the surface of the ocean as they grow. When they die, the phytoplankton sink and carry the organic carbon with them to deeper waters, where it is then remineralized back into CO2.

Using a global ocean biogeochemistry model, Eun Young Kwon and colleagues show that as the remineralization depth at which organic carbon is converted back to CO2 increases, the amount of CO2 injected into the bottom waters also increases. The net result is a reduction in the amount of CO2 escaping back to the atmosphere, and a decrease in the concentration of atmospheric CO2.

The remineralization depth is influenced by a host of climate-sensitive factors ― such as temperature, oxygen concentration and community composition ― and could therefore change as the planet warms, with important consequences for atmospheric CO2 concentrations.

doi: 10.1038/ngeo612


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