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Manganese co-limitation of phytoplankton growth and major nutrient drawdown in the Southern Ocean

Author

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  • Thomas J. Browning

    (Marine Biogeochemistry Division, GEOMAR Helmholtz Centre for Ocean Research)

  • Eric P. Achterberg

    (Marine Biogeochemistry Division, GEOMAR Helmholtz Centre for Ocean Research)

  • Anja Engel

    (Marine Biogeochemistry Division, GEOMAR Helmholtz Centre for Ocean Research)

  • Edward Mawji

    (National Oceanography Centre Southampton)

Abstract

Residual macronutrients in the surface Southern Ocean result from restricted biological utilization, caused by low wintertime irradiance, cold temperatures, and insufficient micronutrients. Variability in utilization alters oceanic CO2 sequestration at glacial-interglacial timescales. The role for insufficient iron has been examined in detail, but manganese also has an essential function in photosynthesis and dissolved concentrations in the Southern Ocean can be strongly depleted. However, clear evidence for or against manganese limitation in this system is lacking. Here we present results from ten experiments distributed across Drake Passage. We found manganese (co-)limited phytoplankton growth and macronutrient consumption in central Drake Passage, whilst iron limitation was widespread nearer the South American and Antarctic continental shelves. Spatial patterns were reconciled with the different rates and timescales for removal of each element from seawater. Our results suggest an important role for manganese in modelling Southern Ocean productivity and understanding major nutrient drawdown in glacial periods.

Suggested Citation

  • Thomas J. Browning & Eric P. Achterberg & Anja Engel & Edward Mawji, 2021. "Manganese co-limitation of phytoplankton growth and major nutrient drawdown in the Southern Ocean," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-21122-6
    DOI: 10.1038/s41467-021-21122-6
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    Cited by:

    1. Thomas J. Browning & C. Mark Moore, 2023. "Global analysis of ocean phytoplankton nutrient limitation reveals high prevalence of co-limitation," Nature Communications, Nature, vol. 14(1), pages 1-12, December.

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