Seasonal copepod lipid pump promotes carbon sequestration in the deep North Atlantic
Estimates of carbon flux to the deep oceans are essential for our understanding of global carbon budgets. Sinking of detrital material (“biological pump”) is usually thought to be the main biological component of this flux. Here, we identify an additional biological mechanism, the seasonal “lipid pu...
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| Veröffentlicht in: | Proceedings of the National Academy of Sciences - PNAS 2015-09, Vol.112 (39), p.12122-12126 |
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| creator | Jónasdóttir, Sigrún Huld Visser, André W. Richardson, Katherine Heath, Michael R. |
| description | Estimates of carbon flux to the deep oceans are essential for our understanding of global carbon budgets. Sinking of detrital material (“biological pump”) is usually thought to be the main biological component of this flux. Here, we identify an additional biological mechanism, the seasonal “lipid pump,” which is highly efficient at sequestering carbon into the deep ocean. It involves the vertical transport and metabolism of carbon rich lipids by overwintering zooplankton. We show that one species, the copepodCalanus finmarchicusoverwintering in the North Atlantic, sequesters an amount of carbon equivalent to the sinking flux of detrital material. The efficiency of the lipid pump derives from a nearcomplete decoupling between nutrient and carbon cycling—a “lipid shunt,” and its direct transport of carbon through the mesopelagic zone to below the permanent thermocline with very little attenuation. Inclusion of the lipid pump almost doubles the previous estimates of deep-ocean carbon sequestration by biological processes in the North Atlantic. |
| doi_str_mv | 10.1073/pnas.1512110112 |
| format | Article |
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| subjects | Animal Migration - physiology Animals Atlantic Ocean Biological Sciences Body Size Calanus finmarchicus Carbon - analysis Carbon cycle Carbon sequestration Carbon Sequestration - physiology Copepoda - chemistry Copepoda - physiology Lipids Lipids - chemistry Physical Sciences Plankton |
| title | Seasonal copepod lipid pump promotes carbon sequestration in the deep North Atlantic |
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