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

被引:39
|
作者
Yool, Andrew [1 ]
Shepherd, John G. [1 ]
Bryden, Harry L. [1 ]
Oschlies, Andreas [2 ]
机构
[1] Natl Oceanog Ctr, Southampton SO14 3ZH, Hants, England
[2] Univ Kiel, Leibniz Inst Marine Sci, IFM, GEOMAR, D-24105 Kiel, Germany
关键词
IRON; SEA; CO2; MODEL; FERTILIZATION; SILICATE; DYNAMICS; EXPORT; CYCLE;
D O I
10.1029/2008JC004792
中图分类号
P7 [海洋学];
学科分类号
0707 ;
摘要
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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页数:13
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