Seasonal copepod lipid pump promotes carbon sequestration in the deep North Atlantic

Sigrun Huld Jónasdóttir, Andre W. Visser, Katherine Richardson, Michael R. Heath

Research output: Contribution to journalArticle

58 Citations (Scopus)

Abstract

Physical, chemical and biological processes can mediate carbon transfer from surface ocean waters to below the permanent pycnocline and so promote ocean carbon sequestration. Passive sinking of organic and carbonate-rich biogenic particles - the ‘biological pump’ -has been estimated to account for a sequestration flux of 2 - 8 gC m-2 yr-1 at around 1000m depth. Here we identify a comparably important mechanism for sequestering carbon in the North Atlantic and other sub-polar seas. We estimate that as a result of the annual vertical migration of overwintering copepods, between 2 and 6 gC m-2 yr-1 are actively transported to below the permanent pycnocline as lipids. Only 25 - 50% of these lipids are carried back to the surface in spring with the surviving copepods, resulting in a sequestration flux of 1 to 4 gC m-2 yr-1. This ’lipid pump’ has gone largely un-recorded in either direct measurements of carbon sequestration, or estimates based on surface production and export flux. In addition, elemental ratios of nitrogen, phosphorus, silicon and iron to carbon are extremely low or zero in lipids, so the lipid pump does not strip the surface ocean of limiting nutrients, and decouples the carbon sink from nutrient replenishment rates.
LanguageEnglish
Pages12122–12126
Number of pages5
JournalProceedings of the National Academy of Sciences
Volume112
Issue number39
Early online date3 Sep 2015
DOIs
Publication statusPublished - 29 Sep 2015

Fingerprint

Lipids
carbon sequestration
Pump
pump
Carbon
lipid
Ocean
pycnocline
sea surface
carbon
Nutrients
biological pump
nutrient
carbon sink
overwintering
vertical migration
chemical process
biological processes
Phosphorus
silicon

Keywords

  • climate change
  • oceanography
  • plankton
  • carbon sequestration
  • lipid

Cite this

Jónasdóttir, Sigrun Huld ; Visser, Andre W. ; Richardson, Katherine ; Heath, Michael R. / Seasonal copepod lipid pump promotes carbon sequestration in the deep North Atlantic. In: Proceedings of the National Academy of Sciences . 2015 ; Vol. 112, No. 39. pp. 12122–12126.
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Seasonal copepod lipid pump promotes carbon sequestration in the deep North Atlantic. / Jónasdóttir, Sigrun Huld; Visser, Andre W.; Richardson, Katherine; Heath, Michael R.

In: Proceedings of the National Academy of Sciences , Vol. 112, No. 39, 29.09.2015, p. 12122–12126.

Research output: Contribution to journalArticle

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