Tracing the role of Arctic shelf processes in Si and N cycling and export through the Fram Strait: insights from combined silicon and nitrate isotopes

Debyser, Margot C. F.; Pichevin, Laetitia; Tuerena, Robyn E.; Dodd, Paul A.; Doncila, Antonia; Ganeshram, Raja S.

doi:https://doi.org/10.5194/bg-19-5499-2022

Articles | Volume 19, issue 23

https://doi.org/10.5194/bg-19-5499-2022

© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/bg-19-5499-2022

© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 19, issue 23

Research article

|

06 Dec 2022

Research article |

| 06 Dec 2022

Tracing the role of Arctic shelf processes in Si and N cycling and export through the Fram Strait: insights from combined silicon and nitrate isotopes

Margot C. F. Debyser, Laetitia Pichevin, Robyn E. Tuerena, Paul A. Dodd, Antonia Doncila, and Raja S. Ganeshram

Supplement

https://doi.org/10.5194/bg-19-5499-2022-supplement

Data sets

Dissolved and particulate stable silicon isotope measurements from CTD niskin depth profiles from cruise JR17005 in the Fram Strait during May-June 2018 Debyser, M. C. F, Pichevin, L., and Ganeshram, R. https://doi.org/10.5285/e92f0984-be44-28bb-e053-6c86abc036a3

Dissolved nutrient samples collected in the Fram Strait as part of the Changing Arctic Ocean programme during cruise JR17005 T. Brand, L. Norman, C. Mahaffey, R. Tuerena, K. Crocket, and S. Henley https://doi.org/10.5285/b61d58df-b8e8-11c4-e053-6c86abc0246c

Nitrate isotope measurements from CTD niskin depth profiles from cruise JR17005 in the Fram Strait during May-June 2018 R. Tuerena and R. Ganeshram https://doi.org/10.5285/b93fb7c0-110e-2470-e053-6c86abc05d60

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Short summary

We focus on the exchange of key nutrients for algae production between the Arctic and Atlantic oceans through the Fram Strait. We show that the export of dissolved silicon here is controlled by the availability of nitrate which is influenced by denitrification on Arctic shelves. We suggest that any future changes in the river inputs of silica and changes in denitrification due to climate change will impact the amount of silicon exported, with impacts on Atlantic algal productivity and ecology.