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Changing carbon-to-nitrogen ratios of organic-matter export under ocean acidification

Author

Listed:
  • Jan Taucher

    (GEOMAR Helmholtz Centre for Ocean Research)

  • Tim Boxhammer

    (GEOMAR Helmholtz Centre for Ocean Research)

  • Lennart T. Bach

    (University of Tasmania)

  • Allanah J. Paul

    (GEOMAR Helmholtz Centre for Ocean Research)

  • Markus Schartau

    (GEOMAR Helmholtz Centre for Ocean Research)

  • Paul Stange

    (GEOMAR Helmholtz Centre for Ocean Research)

  • Ulf Riebesell

    (GEOMAR Helmholtz Centre for Ocean Research)

Abstract

Ocean acidification (OA) will affect marine biotas from the organism to the ecosystem level. Yet, the consequences for the biological carbon pump and thereby the oceanic sink for atmospheric CO2 are still unclear. Here we show that OA considerably alters the C/N ratio of organic-matter export (C/Nexport), a key factor determining efficiency of the biological pump. By synthesizing sediment-trap data from in situ mesocosm studies in different marine biomes, we find distinct but highly variable impacts of OA on C/Nexport, reaching up to a 20% increase/decrease under partial pressure of CO2 ( $$p_{{\rm{CO}}_{2}}$$ p CO 2 ) conditions projected for 2100. These changes are driven by $$p_{{\rm{CO}}_{2}}$$ p CO 2 effects on a variety of plankton taxa and corresponding shifts in food-web structure. Notably, our findings suggest a pivotal role of heterotrophic processes in controlling the response of C/Nexport to OA, thus contradicting the paradigm of primary producers as the principal driver of biogeochemical responses to ocean change.

Suggested Citation

  • Jan Taucher & Tim Boxhammer & Lennart T. Bach & Allanah J. Paul & Markus Schartau & Paul Stange & Ulf Riebesell, 2021. "Changing carbon-to-nitrogen ratios of organic-matter export under ocean acidification," Nature Climate Change, Nature, vol. 11(1), pages 52-57, January.
    • Handle: RePEc:nat:natcli:v:11:y:2021:i:1:d:10.1038_s41558-020-00915-5
    DOI: 10.1038/s41558-020-00915-5
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