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Low efficiency of nutrient translocation for enhancing oceanic uptake of carbon dioxide

Yool, Andrew, Shepherd, John G., Bryden, Harry L. and Oschlies, Andreas (2009) Low efficiency of nutrient translocation for enhancing oceanic uptake of carbon dioxide Journal of Geophysical Research, 114, (C8), C08009. (doi:10.1029/2008JC004792).

Record type: Article


Anthropogenic emissions of carbon dioxide (CO2) are steadily increasing the concentration of this greenhouse gas in the Earth's atmosphere. The possible long-term consequences of this elevated concentration have led to proposals for a number of large-scale geoengineering schemes that aim to enhance or augment natural sinks for CO2. One such scheme proposes deploying a large number of floating “pipes” in the ocean that act to translocate nutrient-rich seawater from below the mixed layer to the ocean's surface: the nutrient supplied should enhance the growth of phytoplankton and consequently the export of organic carbon to the deep ocean via the biological pump. Here we examine the practical consequences of this scheme in a global ocean general circulation model that includes a nitrogen-based ecosystem and the biogeochemical cycle of carbon. While primary production is generally enhanced by the modeled pipes, as expected, the effect on the uptake of CO2 from the atmosphere is much smaller, may be negative, and shows considerable spatiotemporal variability.

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Published date: 21 August 2009
Organisations: Ocean and Earth Science, National Oceanography Centre,Southampton


Local EPrints ID: 69142
ISSN: 0148-0227
PURE UUID: 62dd5b41-c807-48b8-a867-1fff082b83a5
ORCID for John G. Shepherd: ORCID iD
ORCID for Harry L. Bryden: ORCID iD

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Date deposited: 20 Oct 2009
Last modified: 19 Jul 2017 00:13

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