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.
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.
the Creative Commons Attribution 4.0 License.
Research article
| 
06 Dec 2022
Research article |
| 06 Dec 2022
| 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
CORRESPONDING AUTHOR
School of Geosciences, University of Edinburgh, Edinburgh, EH9 3FE,
United Kingdom
Laetitia Pichevin
School of Geosciences, University of Edinburgh, Edinburgh, EH9 3FE,
United Kingdom
Robyn E. Tuerena
Scottish Association for Marine Science, Dunstaffnage, PA37 1QA,
United Kingdom
Paul A. Dodd
Norwegian Polar Institute, Tromsø 9296, Norway
Antonia Doncila
School of Geosciences, University of Edinburgh, Edinburgh, EH9 3FE,
United Kingdom
Raja S. Ganeshram
School of Geosciences, University of Edinburgh, Edinburgh, EH9 3FE,
United Kingdom
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Cited articles
Agustí, S., Assmy, P., Duarte, C. M., Wiedmann, I., Marquez, I. A.,
Fernández-Méndez, M., Kristiansen, S., Krause, J. W., and Wassmann,
P.: Biogenic silica production and diatom dynamics in the Svalbard region
during spring, Biogeosciences, 15, 6503–6517,
https://doi.org/10.5194/bg-15-6503-2018, 2018.
Allen, J. T., Brown, L., Sanders, R., Moore, C. M., Mustard, A., Fielding,
S., Lucas, M., Rixen, M., Savidge, G., Henson, S., and Mayor, D.: Diatom
carbon export enhanced by silicate upwelling in the northeast Atlantic,
Nature, 437, 728–732, https://doi.org/10.1038/nature03948, 2005.
Altabet, M. A. and Francois, R.: Nitrogen isotope biogeochemistry of the
Antarctic polar frontal zone at 170∘ W, Deep-Sea Res. Pt. II, 48, 4247–4273, https://doi.org/10.1016/S0967-0645(01)00088-1,
2001.
Archer, D., Lyle, M., Rodgers, K., and Froelich, P.: What controls opal
preservation in tropical deep-sea sediments?, Paleoceanography, 8, 7–21,
1993.
Ardyna, M. and Arrigo, K. R.: Phytoplankton dynamics in a changing Arctic
Ocean, Nat. Clim. Change, 10, 892–903, https://doi.org/10.1038/s41558-020-0905-y,
2020.
Arrigo, K. R. and van Dijken, G. L.: Continued increases in Arctic Ocean
primary production, Prog. Oceanogr., 136, 60–70,
https://doi.org/10.1016/j.pocean.2015.05.002, 2015.
Arrigo, K. R., van Dijken, G., and Pabi, S.: Impact of a shrinking Arctic ice
cover on marine primary production, Geophys. Res. Lett., 35, 1–6,
https://doi.org/10.1029/2008GL035028, 2008.
Arthun, M., Eldevik, T., Smedsrud, L., Skagseth, Ø., and Ingvaldsen, R.: Quantifying the Influence of Atlantic Heat on Barents Sea Ice Variability
and Retreat*, J. Clim., 25, 4736–4743, https://doi.org/10.1175/JCLI-D-11-00466.1,
2012.
Brand, T., Norman, L., Mahaffey, C., Tuerena, R., Crocket, K., and Henley,
S.: Dissolved nutrient samples collected in the Fram Strait as part of the
Changing Arctic Ocean programme during cruise JR17005, May–June 2018, British Oceanographic Database [data set],
https://doi.org/10.5285/b61d58df-b8e8-11c4-e053-6c86abc0246c, 2020.
Brown, Z. W., Casciotti, K. L., Pickart, R. S., Swift, J. H., and Arrigo, K.
R.: Aspects of the marine nitrogen cycle of the Chukchi Sea shelf and Canada
Basin, Deep-Sea Res. Pt. II, 118, 73–87,
https://doi.org/10.1016/j.dsr2.2015.02.009, 2015.
Brzezinski, M. A. and Jones, J. L.: Coupling of the distribution of silicon
isotopes to the meridional overturning circulation of the North Atlantic
Ocean, Deep-Sea Res. Pt. II, 116, 79–88,
https://doi.org/10.1016/j.dsr2.2014.11.015, 2015.
Brzezinski, M. A., Jones, J. L., Barbara, S., Bidle, K. D., and Azam, F.: The
balance between silica production and silica dissolution in the sea:
Insights from Monterey Bay, California, applied to the global data set,
Limnol. Oceanogr., 48, 1846–1854, 2003.
Brzezinski, M. A., Closset, I., Jones, J. L., de Souza, G. F., and Maden, C.:
New Constraints on the Physical and Biological Controls on the Silicon
Isotopic Composition of the Arctic Ocean, Front. Mar. Sci., 8, 699762,
https://doi.org/10.3389/fmars.2021.699762, 2021.
Budeus, G. and Schneider, W.: On the hydrography of the Northeast Water
Polynya, J. Geophys. Res., 100, 4269–4286, https://doi.org/10.1029/94JC02349, 1995.
Cardinal, D., Alleman, L. Y., De Jong, J., Ziegler, K., and André, L.:
Isotopic composition of silicon measured by multicollector plasma source
mass spectrometry in dry plasma mode, J. Anal. At. Spectrom., 18,
213–218, https://doi.org/10.1039/b210109b, 2003.
Cardinal, D., Alleman, L. Y., Dehairs, F., Savoye, N., Trull, T. W., and
André, L.: Relevance of silicon isotopes to Si-nutrient utilization and
Si-source assessment in Antarctic waters, Global Biogeochem. Cy., 19,
1–13, https://doi.org/10.1029/2004GB002364, 2005.
Casciotti, K. L., Sigman, D. M., Hastings, M. G., Bo, J. K., and Hilkert, A.:
Measurement of the Oxygen Isotopic Composition of Nitrate in Seawater and
Freshwater Using the Denitrifier Method, Anal. Chem., 74, 4905–4912,
https://doi.org/10.1021/ac020113w, 2002.
Charette, M. A., Kipp, L. E., Jensen, L. T., Dabrowski, J. S., Whitmore, L.
M., Fitzsimmons, J. N., Williford, T., Ulfsbo, A., Jones, E., Bundy, R. M.,
Vivancos, S. M., Pahnke, K., John, S. G., Xiang, Y., Hatta, M., Petrova, M.
V., Heimbürger-Boavida, L. E., Bauch, D., Newton, R., Pasqualini, A.,
Agather, A. M., Amon, R. M. W., Anderson, R. F., Andersson, P. S., Benner,
R., Bowman, K. L., Edwards, R. L., Gdaniec, S., Gerringa, L. J. A.,
González, A. G., Granskog, M., Haley, B., Hammerschmidt, C. R., Hansell,
D. A., Henderson, P. B., Kadko, D. C., Kaiser, K., Laan, P., Lam, P. J.,
Lamborg, C. H., Levier, M., Li, X., Margolin, A. R., Measures, C., Middag,
R., Millero, F. J., Moore, W. S., Paffrath, R., Planquette, H., Rabe, B.,
Reader, H., Rember, R., Rijkenberg, M. J. A., Roy-Barman, M., Rutgers van
der Loeff, M., Saito, M., Schauer, U., Schlosser, P., Sherrell, R. M.,
Shiller, A. M., Slagter, H., Sonke, J. E., Stedmon, C., Woosley, R. J.,
Valk, O., van Ooijen, J., and Zhang, R.: The Transpolar Drift as a Source of
Riverine and Shelf-Derived Trace Elements to the Central Arctic Ocean, J.
Geophys. Res.-Ocean., 125, 1–34, https://doi.org/10.1029/2019JC015920, 2020.
Debyser, M. C. F., Pichevin, L., and Ganeshram, R.: Dissolved and particulate stable silicon isotope measurements from CTD niskin depth profiles from cruise JR17005 in the Fram Strait during May–June 2018, NERC EDS British Oceanographic Data Centre NOC [data set], https://doi.org/10.5285/e92f0984-be44-28bb-e053-6c86abc036a3, 2022.
De Souza, G. F., Reynolds, B. C., Rickli, J., Frank, M., Saito, M. A.,
Gerringa, L. J. A., and Bourdon, B.: Southern Ocean control of silicon stable
isotope distribution in the deep Atlantic Ocean, Global Biogeochem. Cy.,
26, 1–13, https://doi.org/10.1029/2011GB004141, 2012.
de Steur, L., Hansen, E., Gerdes, R., Karcher, M., Fahrbach, E., and Holfort,
J.: Freshwater fluxes in the East Greenland Current: A decade of
observations, Geophys. Res. Lett., 36, L23611, https://doi.org/10.1029/2009GL041278,
2009.
Dodd, P. A., Rabe, B., Hansen, E., Falck, E., MacKensen, A., Rohling, E.,
Stedmon, C., and Kristiansen, S.: The freshwater composition of the Fram
Strait outflow derived from a decade of tracer measurements, J. Geophys.
Res.-Ocean., 117, 1–26, https://doi.org/10.1029/2012JC008011, 2012.
Doncila, A.: Nitrogen Cycling in the Warming Arctic Ocean, PhD Thesis, University of
Edinburgh, https://doi.org/10.7488/era/2067, 2020.
Ehlert, C., Doering, K., Wallmann, K., Scholz, F., Sommer, S., Grasse, P.,
Geilert, S., and Frank, M.: Stable silicon isotope signatures of marine pore
waters – Biogenic opal dissolution versus authigenic clay mineral
formation, Geochim. Cosmochim. Ac., 191, 102–117,
https://doi.org/10.1016/j.gca.2016.07.022, 2016.
Francis, A.: Stable Isotope Tracing of Dissolved Nitrogen from Permafrost
Degradation in Arctic Rivers, University of Edinburgh, master thesis, 2019.
Frey, K. E. and McClelland, J. W.: Impacts of permafrost degradation on
arctic river biogeochemistry, Hydrol. Process., 23, 169–182,
https://doi.org/10.1002/hyp.7196, 2009.
Frey, K. E., McClelland, J. W., Holmes, R. M., and Smith, L. G.: Impacts of
climate warming and permafrost thaw on the riverine transport of nitrogen
and phosphorus to the Kara Sea, J. Geophys. Res.-Biogeo., 112,
1–10, https://doi.org/10.1029/2006JG000369, 2007.
Fripiat, F., Cardinal, D., Tison, J. L., Worby, A., and André, L.:
Diatom-induced silicon isotopic fractionation in Antarctic sea ice, J.
Geophys. Res.-Biogeo., 112, G02001, https://doi.org/10.1029/2006JG000244, 2007.
Fripiat, F., Cavagna, A. J., Savoye, N., Dehairs, F., André, L., and
Cardinal, D.: Isotopic constraints on the Si-biogeochemical cycle of the
Antarctic Zone in the Kerguelen area (KEOPS), Mar. Chem., 123, 11–22,
https://doi.org/10.1016/j.marchem.2010.08.005, 2011a.
Fripiat, F., Cavagna, A. J., Dehairs, F., Speich, S., André, L., and
Cardinal, D.: Silicon pool dynamics and biogenic silica export in the
Southern Ocean inferred from Si-isotopes, Ocean Sci., 7, 533–547,
https://doi.org/10.5194/os-7-533-2011, 2011b.
Fripiat, F., Tison, J. L., André, L., Notz, D., and Delille, B.: Biogenic
silica recycling in sea ice inferred from Si-isotopes: Constraints from
Arctic winter first-year sea ice, Biogeochemistry, 119, 25–33,
https://doi.org/10.1007/s10533-013-9911-8, 2014.
Fripiat, F., Meiners, K. M., Vancoppenolle, M., Papadimitriou, S., Thomas,
D. N., Ackley, S. F., Arrigo, K. R., Carnat, G., Cozzi, S., Delille, B.,
Dieckmann, G. S., Dunbar, R. B., Fransson, A., Kattner, G., Kennedy, H.,
Lannuzel, D., Munro, D. R., Nomura, D., Rintala, J. M., Schoemann, V.,
Stefels, J., Steiner, N., and Tison, J. L.: Macro-nutrient concentrations in
Antarctic pack ice: Overall patterns and overlooked processes, Elementa, 5, 13,
https://doi.org/10.1525/elementa.217, 2017.
Fripiat, F., Declercq, M., Sapart, C. J., Anderson, L. G., Bruechert, V.,
Deman, F., Fonseca-Batista, D., Humborg, C., Roukaerts, A., Semiletov, I. P.,
and Dehairs, F.: Influence of the bordering shelves on nutrient distribution
in the Arctic halocline inferred from water column nitrate isotopes, Limnol.
Oceanogr., 63, 2154–2170, https://doi.org/10.1002/lno.10930, 2018.
Georg, R. B., Reynolds, B. C., Frank, M., and Halliday, A. N.: New sample
preparation techniques for the determination of Si isotopic compositions
using MC-ICPMS, Chem. Geol., 235, 95–104,
https://doi.org/10.1016/j.chemgeo.2006.06.006, 2006.
Giesbrecht, K. E. and Varela, D. E.: Summertime Biogenic Silica Production
and Silicon Limitation in the Pacific Arctic Region From 2006 to 2016,
Global Biogeochem. Cy., 35, 1–27, https://doi.org/10.1029/2020GB006629, 2021.
Giesbrecht, K. E., Varela, D. E., Wiktor, J., Grebmeier, J. M., Kelly, B.,
and Long, J. E.: A decade of summertime measurements of phytoplankton
biomass, productivity and assemblage composition in the Pacific Arctic
Region from 2006 to 2016, Deep-Sea Res. Pt. II, 162, 93–113, https://doi.org/10.1016/j.dsr2.2018.06.010, 2019.
Giesbrecht, K. E., Varela, D. E., Souza, G. F., and Maden, C.: Natural
Variations in Dissolved Silicon Isotopes Across the Arctic Ocean From the
Pacific to the Atlantic, Global Biogeochem. Cy, 36, 1–23,
https://doi.org/10.1029/2021gb007107, 2022.
Granger, J., Sigman, D. M., Needoba, J. A., and Harrison, P. J.: Coupled
nitrogen and oxygen isotope fractionation of nitrate during assimilation by
cultures of marine phytoplankton, Limnol. Oceanogr., 49, 1763–1773,
https://doi.org/10.4319/lo.2004.49.5.1763, 2004.
Granger, J., Prokopenko, M. G., Sigman, D. M., Mordy, C. W., Morse, Z. M.,
Morales, L. V., Sambrotto, R. N., and Plessen, B.: Coupled
nitrification-denitrification in sediment of the eastern Bering Sea shelf
leads to 15N enrichment of fixed N in shelf waters, J. Geophys. Res.-Ocean.,
116, 1–18, https://doi.org/10.1029/2010JC006751, 2011.
Granger, J., Sigman, D. M., Gagnon, J., Tremblay, J. E., and Mucci, A.: On
the Properties of the Arctic Halocline and Deep Water Masses of the Canada
Basin from Nitrate Isotope Ratios, J. Geophys. Res.-Ocean., 123,
5443–5458, https://doi.org/10.1029/2018JC014110, 2018.
Grasse, P., Ryabenko, E., Ehlert, C., Altabet, M. A., and Frank, M.: Silicon
and nitrogen cycling in the upwelling area off Peru: A dual isotope
approach, Limnol. Oceanogr., 61, 1661–1676, https://doi.org/10.1002/lno.10324, 2016.
Grasse, P., Brzezinski, M. A., Cardinal, D., Souza, G. F. De, Estrade, N.,
François, R., Frank, M., Jiang, G., Jones, J. L., Kooijman, E., Liu, Q.,
Lu, D., Pahnke, K., Ponzevera, E., Schmitt, M., Sun, X., Sutton, J. N.,
Thil, F., and Weis, D.: GEOTRACES inter-calibration of the stable silicon
isotope composition of dissolved silicic acid in seawater, J. Anal. At.
Spectrom., 32, 562–578, https://doi.org/10.1039/c6ja00302h, 2017.
Gruber, N. and Sarmiento, J. L.: Global patterns of marine nitrogen fixation
and denitrification, Global Biogeochem. Cy., 11, 235–266, 1997.
Hansen, H. P. and Koroleff, F.: Determination of nutrients, in: Methods of
Seawater Analysis, edited by: Kremlingi, K. and Ehrhardt, M., 159–228,
WLEY-VCH Verlag GmbH, 1999.
Hatton, J. E., Hendry, K. R., Hawkings, J. R., Wadham, J. L., Opfergelt, S.,
Kohler, T. J., Yde, J. C., Stibal, M., and Žárský, J. D.: Silicon
isotopes in Arctic and sub-Arctic glacial meltwaters: the role of subglacial
weathering in the silicon cycle, Proc. R. Soc. A,
475, 20190098, https://doi.org/10.1098/rspa.2019.0098, 2019.
Hátún, H., Azetsu-Scott, K., Somavilla, R., Rey, F., Johnson, C.,
Mathis, M., Mikolajewicz, U., Coupel, P., Tremblay, J., Hartman, S.,
Pacariz, S. V., Salter, I., and Ólafsson, J.: The subpolar gyre regulates
silicate concentrations in the North Atlantic, Sci. Rep., 7, 1–9,
https://doi.org/10.1038/s41598-017-14837-4, 2017.
Hawkings, J. R., Wadham, J. L., Benning, L. G., Hendry, K. R., Tranter, M.,
Tedstone, A., Nienow, P., and Raiswell, R.: Ice sheets as a missing source of
silica to the polar oceans, Nat. Commun., 8, 1–10,
https://doi.org/10.1038/ncomms14198, 2017.
Hawkings, J. R., Hatton, J. E., Hendry, K. R., de Souza, G. F., Wadham, J.
L., Ivanovic, R., Kohler, T. J., Stibal, M., Beaton, A., Lamarche-Gagnon,
G., Tedstone, A., Hain, M. P., Bagshaw, E., Pike, J., and Tranter, M.: The
silicon cycle impacted by past ice sheets, Nat. Commun., 9, 1–10,
https://doi.org/10.1038/s41467-018-05689-1, 2018.
Henson, S. A., Sanders, R., Holeton, C., and Allen, J. T.: Timing of nutrient
depletion, diatom dominance and a lower-boundary estimate of export
production for Irminger Basin, North Atlantic, Mar. Ecol. Prog. Ser., 313,
73–84, https://doi.org/10.3354/meps313073, 2006.
Holmes, R. M., Mcclelland, J. W., Peterson, B. J., Tank, S. E., Bulygina,
E., Eglinton, T. I., Gordeev, V. V, Gurtovaya, T. Y., Raymond, P. A.,
Repeta, D. J., Staples, R., Striegl, R. G., Zhulidov, A. V., and Zimov, S. A.:
Seasonal and Annual Fluxes of Nutrients and Organic Matter from Large Rivers
to the Arctic Ocean and Surrounding Seas, Estuar. Coast., 35,
369–382, https://doi.org/10.1007/s12237-011-9386-6, 2012.
Hopwood, M. J., Carroll, D., Dunse, T., Hodson, A., Holding, J. M., Iriarte,
J. L., Ribeiro, S., Achterberg, E. P., Cantoni, C., Carlson, D. F.,
Chierici, M., Clarke, J. S., Cozzi, S., Fransson, A., Juul-Pedersen, T.,
Winding, M. H. S., and Meire, L.: Review article: How does glacier discharge
affect marine biogeochemistry and primary production in the Arctic?,
The Cryosphere, 14, 1347–1383, https://doi.org/10.5194/tc-14-1347-2020, 2020.
Hutchins, D. A. and Bruland, K. W.: Iron-limited growth and Si:N ratios in a
costal upwelling regime, Nature, 393, 561–564, 1998.
Kamatani, A.: Dissolution rates of silica from diatoms decomposing at
various temperatures, Mar. Biol., 68, 91–96, https://doi.org/10.1007/BF00393146,
1982.
Karl, D. M. and Tien, G.: MAGIC: A sensitive and precise method for
measuring dissolved phosphorus in aquatic environments, Limnol. Oceanogr.,
37, 105–116, https://doi.org/10.4319/lo.1992.37.1.0105, 1992.
Krause, J. W., Duarte, C. M., Marquez, I. A., Assmy, P., Fernández-Méndez, M., Wiedmann, I., Wassmann, P., Kristiansen, S., and Agustí, S.: Biogenic silica production and diatom dynamics in the Svalbard region during spring, Biogeosciences, 15, 6503–6517, https://doi.org/10.5194/bg-15-6503-2018, 2018.
Krause, J. W., Schulz, I. K., Rowe, K. A., Dobbins, W., Winding, M. H. S.,
Sejr, M. K., Duarte, C. M., and Agustí, S.: Silicic acid limitation
drives bloom termination and potential carbon sequestration in an Arctic
bloom, Sci. Rep., 9, 1–11, https://doi.org/10.1038/s41598-019-44587-4, 2019.
Krisch, S., Browning, T. J., Graeve, M., Ludwichowski, K. U., Lodeiro, P.,
Hopwood, M. J., Roig, S., Yong, J. C., Kanzow, T., and Achterberg, E. P.: The
influence of Arctic Fe and Atlantic fixed N on summertime primary production
in Fram Strait, North Greenland Sea, Sci. Rep., 10, 1–13,
https://doi.org/10.1038/s41598-020-72100-9, 2020.
Lalande, C., Bauerfeind, E., Nöthig, E. M., and Beszczynska-Möller,
A.: Impact of a warm anomaly on export fluxes of biogenic matter in the
eastern Fram Strait, Prog. Oceanogr., 109, 70–77,
https://doi.org/10.1016/j.pocean.2012.09.006, 2013.
Leblanc, K., Leynaert, A., Fernandez, I. C., Rimmelin, P., Moutin, T.,
Raimbault, P., Ras, J., and Quéguiner, B.: A seasonal study of diatom
dynamics in the North Atlantic during the POMME experiment (2001): Evidence
for Si limitation of the spring bloom, J. Geophys. Res.-Ocean., 110,
1–16, https://doi.org/10.1029/2004JC002621, 2005.
Le Fouest, V., Babin, M., and Tremblay, J. E.: The fate of riverine nutrients
on Arctic shelves, Biogeosciences, 10, 3661–3677,
https://doi.org/10.5194/bg-10-3661-2013, 2013.
Letscher, R. T., Hansell, D. A., Kadko, D., and Bates, N. R.: Dissolved
organic nitrogen dynamics in the Arctic Ocean, Mar. Chem., 148, 1–9,
https://doi.org/10.1016/j.marchem.2012.10.002, 2013.
Liguori, B. T. P., Ehlert, C., and Pahnke, K.: The Influence of Water Mass
Mixing and Particle Dissolution on the Silicon Cycle in the Central Arctic
Ocean, Front. Mar. Sci., 7, 1–16, https://doi.org/10.3389/fmars.2020.00202,
2020.
Liguori, B. T. P., Ehlert, C., Nöthig, E. M., van Ooijen, J. C., and
Pahnke, K.: The Transpolar Drift Influence on the Arctic Ocean Silicon
Cycle, J. Geophys. Res.-Ocean., 126, e2021JC017352, https://doi.org/10.1029/2021JC017352, 2021.
Lind, S., Ingvaldsen, R. B., and Furevik, T.: Arctic warming hotspot in the
northern Barents Sea linked to declining sea-ice import, Nat. Clim. Change,
8, 634–639, https://doi.org/10.1038/s41558-018-0205-y, 2018.
Macdonald, R. W., Anderson, L. G., Christensen, J. P., Miller, L. .,
Semiletov, I. P., and Stein, R.: The Arctic Ocean, in: Carbon and Nutrient
Fluxes in Continental Margins, edited by: Liu, K. K., 292–303,
Springer-Verlag, Berlin Heidelberg, ISBN 978-3-540-92734-1, 2010.
Mariotti, A., Germon, J. C., Hubert, P., Kaiser, P., Letolle, R., Tardieux,
A., and Tardieux, P.: Experimental determination of nitrogen kinetic isotope
fractionation: some principles; illustration for the denitrification and
nitrification processes, Plant Soil, 62, 413–430, 1981.
Mavromatis, V., Rinder, T., Prokushkin, A. S., Pokrovsky, O. S., Korets, M.
A., Chmeleff, J., and Oelkers, E. H.: The effect of permafrost, vegetation,
and lithology on Mg and Si isotope composition of the Yenisey River and its
tributaries at the end of the spring flood, Geochim. Cosmochim. Ac., 191,
32–46, https://doi.org/10.1016/j.gca.2016.07.003, 2016.
Mcclelland, J. W., De, S. J., Peterson, B. J., Holmes, R. M., and Wood, E.
F.: A pan-arctic evaluation of changes in river discharge during the latter
half of the 20th century, Geophys. Res. Lett., 33, 2–5,
https://doi.org/10.1029/2006GL025753, 2006.
Mctigue, N. D., Gardner, W. S., Dunton, K. H., and Hardison, A. K.: Biotic
and abiotic controls on co-occurring nitrogen cycling processes in shallow
Arctic shelf sediments, Nat. Commun., 7, 1–11, https://doi.org/10.1038/ncomms13145,
2016.
Meire, L., Meire, P., Struyf, E., Krawczyk, D. W., Arendt, K. E., Yde, J.
C., Juul Pedersen, T., Hopwood, M. J., Rysgaard, S., and Meysman, F. J. R.:
High export of dissolved silica from the Greenland Ice Sheet, Geophys. Res.
Lett., 43, 9173–9182, https://doi.org/10.1002/2016GL070191, 2016.
Moore, C. M., Mills, M. M., Arrigo, K. R., Berman-Frank, I., Bopp, L., Boyd,
P. W., Galbraith, E. D., Geider, R. J., Guieu, C., Jaccard, S. L., Jickells,
T. D., La Roche, J., Lenton, T. M., Mahowald, N. M., Marañón, E.,
Marinov, I., Moore, J. K., Nakatsuka, T., Oschlies, A., Saito, M. A.,
Thingstad, T. F., Tsuda, A., and Ulloa, O.: Processes and patterns of oceanic
nutrient limitation, Nat. Geosci., 6, 701–710, https://doi.org/10.1038/ngeo1765,
2013.
Nelson, D. M., Tréguer, P., Brzezinski, M. A., Leynaert, A., and
Quéguiner, B.: Production and dissolution of biogenic silica in the
ocean: Revised global estimates, comparison with regional data and
relationship to biogenic sedimentation, Global Biogeochem. Cy., 9,
359–372, https://doi.org/10.1029/95GB01070, 1995.
Ng, H. C., Cassarino, L., Pickering, R. A., Woodward, E. M. S., Hammond, S.
J., and Hendry, K. R.: Sediment efflux of silicon on the Greenland margin and
implications for the marine silicon cycle, Earth Planet. Sci. Lett., 529,
115877, https://doi.org/10.1016/j.epsl.2019.115877, 2020.
Peralta-Ferriz, C. and Woodgate, R. A.: Seasonal and interannual variability
of pan-Arctic surface mixed layer properties from 1979 to 2012 from
hydrographic data, and the dominance of stratification for multiyear mixed
layer depth shoaling, Prog. Oceanogr., 134, 19–53,
https://doi.org/10.1016/j.pocean.2014.12.005, 2015.
Pokrovsky, O. S., Reynolds, B. C., Prokushkin, A. S., Schott, J., and Viers,
J.: Silicon isotope variations in Central Siberian rivers during basalt
weathering in permafrost-dominated larch forests, Chem. Geol., 355,
103–116, https://doi.org/10.1016/j.chemgeo.2013.07.016, 2013.
Popova, E. E., Yool, A., Coward, A. C., Dupont, F., Deal, C., Elliott, S.,
Hunke, E., Jin, M., Steele, M., and Zhang, J.: What controls primary
production in the Arctic Ocean? Results from an intercomparison of five
general circulation models with biogeochemistry, J. Geophys. Res.-Ocean.,
117, 1–16, https://doi.org/10.1029/2011JC007112, 2012.
Rafter, P. A., Difiore, P. J., and Sigman, D. M.: Coupled nitrate nitrogen
and oxygen isotopes and organic matter remineralization in the Southern and
Pacific Oceans, J. Geophys. Res.-Ocean., 118, 4781–4794,
https://doi.org/10.1002/jgrc.20316, 2013.
Randelhoff, A., Reigstad, M., Chierici, M., Sundfjord, A., Ivanov, V., Cape,
M., Vernet, M., Tremblay, J.-É., Bratbak, G., and Kristiansen, S.:
Seasonality of the Physical and Biogeochemical Hydrography in the Inflow to
the Arctic Ocean Through Fram Strait, Front. Mar. Sci., 5, 1–16,
https://doi.org/10.3389/fmars.2018.00224, 2018.
Rawlins, M. A., Steele, M., Holland, M. M., Adam, J. C., Cherry, J. E.,
Francis, J. A., Groisman, P. Y., Hinzman, L. D., Huntington, T. G., Kane, D.
L., Kimball, J. S., Kwok, R., Lammers, R. B., Lee, C. M., Lettenmaier, D.
P., Mcdonald, K. C., Podest, E., Pundsack, J. W., Rudels, B., Serreze, M.
C., Shiklomanov, A., Skagseth, Ø., Troy, T. J., Vörösmarty, C.
J., Wensnahan, M., Wood, E. F., Woodgate, R., Yang, D., Zhang, K., and Zhang,
T.: Analysis of the Arctic system for freshwater cycle intensification:
Observations and expectations, J. Clim., 23, 5715–5737,
https://doi.org/10.1175/2010JCLI3421.1, 2010.
Reynolds, B. C., Frank, M., and Halliday, A. N.: Silicon isotope
fractionation during nutrient utilization in the North Pacific, Earth
Planet. Sc. Lett., 244, 431–443, https://doi.org/10.1016/j.epsl.2006.02.002,
2006.
Reynolds, B. C., Aggarwal, J., Andre, L., Georg, R. B., Beucher, C.,
Brzezinski, M. A., Engstro, E., Land, M., Leng, M. J., Opfergelt, S.,
Rodushkin, I., Sloane, H. J., Van Den Boorn, S. H. J. M., and Vroon, Z.: An
inter-laboratory comparison of Si isotope reference materials, J. Anal. At.
Spectrom., 22, 561–568, https://doi.org/10.1039/b616755a, 2007.
Richter, M. E., Von Appen, W. J., and Wekerle, C.: Does the East Greenland
Current exist in the northern Fram Strait?, Ocean Sci., 14, 1147–1165,
https://doi.org/10.5194/os-14-1147-2018, 2018.
Rudels, B., Fahrbach, E., Meincke, J., Budéus, G., and Eriksson, P.: The
East Greenland Current and its contribution to the Denmark Strait overflow,
ICES J. Mar. Sci., 59, 1133–1154, https://doi.org/10.1006/jmsc.2002.1284, 2002.
Rudels, B., Björk, G., Nilsson, J., Winsor, P., Lake, I., and Nohr, C.:
The interaction between waters from the Arctic Ocean and the Nordic Seas
north of Fram Strait and along the East Greenland Current: Results from the
Arctic Ocean-02 Oden expedition, J. Mar. Syst., 55, 1–30,
https://doi.org/10.1016/j.jmarsys.2004.06.008, 2005.
Sanders, T., Fiencke, C., Fuchs, M., Haugk, C., Juhls, B., Mollenhauer, G.,
Ogneva, O., Overduin, P., Palmtag, J., Povazhniy, V., Strauss, J., Tuerena,
R., Zell, N., and Dähnke, K.: Seasonal nitrogen fluxes of the Lena River
Delta, Ambio, 51, 423–438, https://doi.org/10.1007/s13280-021-01665-0, 2021.
Sarmiento, J. L., Gruber, N., Brzezinski, M. A., and Dunne, J. P.:
High-latitude controls of thermocline nutrients and low latitude biological
productivity, Nature, 427, 56–60,
2004.
Schneider, W. and Budeus, G.: On the generation of the Northeast Water
Polynya, J. Geophys. Res., 100, 4269–4286, https://doi.org/10.1029/94JC02349, 1995.
Schnetger, B. and Lehners, C.: Determination of nitrate plus nitrite in
small volume marine water samples using vanadium(III)chloride as a reduction
agent, Mar. Chem., 160, 91–98, https://doi.org/10.1016/j.marchem.2014.01.010, 2014.
Sigman, D. M., Altabet, M. A., McCorkle, D. C., Francois, R., and Fischer,
G.: The δ15 N of nitrate in the Southern Ocean: Nitrogen
cycling and circulation in the ocean interior, J. Geophys. Res.-Ocean.,
105, 19599–19614, https://doi.org/10.1029/2000JC000265, 2000.
Sigman, D. M., Casciotti, K. L., Andreani, M., Barford, C., Galanter, M., and
Böhlke, J. K.: A bacterial method for the nitrogen isotopic analysis of
nitrate in seawater and freshwater, Anal. Chem., 73, 4145–4153,
https://doi.org/10.1021/ac010088e, 2001.
Sigman, D. M., Granger, J., DiFiore, P. J., Lehmann, M. M., Ho, R., Cane, G.,
and van Geen, A.: Coupled nitrogen and oxygen isotope measurements of
nitrate along the eastern North Pacific margin, Global Biogeochem. Cy.,
19, 1–14, https://doi.org/10.1029/2005GB002458, 2005.
Stedmon, C. A., Granskog, M. A., and Dodd, P. A.: An approach to estimate the
freshwater contribution from glacial melt and precipitation in East
Greenland shelf waters using colored dissolved organic matter (CDOM), J.
Geophys. Res.-Ocean., 120, 1107–1117, 2015.
Sun, X., Mörth, C. M., Porcelli, D., Kutscher, L., Hirst, C., Murphy, M.
J., Maximov, T., Petrov, R. E., Humborg, C., Schmitt, M., and Andersson, P.
S.: Stable silicon isotopic compositions of the Lena River and its
tributaries: Implications for silicon delivery to the Arctic Ocean, Geochim.
Cosmochim. Ac., 241, 120–133, https://doi.org/10.1016/j.gca.2018.08.044, 2018.
Sutton, J. N., de Souza, G. F., García-Ibáñez, M. I., and De La Rocha, C. L.: The silicon stable isotope distribution along the GEOVIDE section (GEOTRACES GA-01) of the North Atlantic Ocean, Biogeosciences, 15, 5663–5676, https://doi.org/10.5194/bg-15-5663-2018, 2018.
Terhaar, J., Lauerwald, R., Regnier, P., Gruber, N., and Bopp, L.: Around one
third of current Arctic Ocean primary production sustained by rivers and
coastal erosion, Nat. Commun., 12, 1–10, https://doi.org/10.1038/s41467-020-20470-z,
2021.
Thibodeau, B., Bauch, D., and Voss, M.: Nitrogen dynamic in Eurasian coastal
Arctic ecosystem: Insight from nitrogen isotope, Global Biogeochem. Cy.,
31, 836–849, https://doi.org/10.1002/2016GB005593, 2017.
Torres-Valdés, S., Tsubouchi, T., Bacon, S., Naveira-Garabato, A. C.,
Sanders, R., McLaughlin, F. A., Petrie, B., Kattner, G., Azetsu-Scott, K.,
and Whitledge, T. E.: Export of nutrients from the Arctic Ocean, J. Geophys.
Res.-Ocean., 118, 1625–1644, https://doi.org/10.1002/jgrc.20063, 2013.
Tremblay, J. É., Anderson, L. G., Matrai, P., Coupel, P., Bélanger,
S., Michel, C., and Reigstad, M.: Global and regional drivers of nutrient
supply, primary production and CO2 drawdown in the changing Arctic Ocean,
Prog. Oceanogr., 139, 171–196, https://doi.org/10.1016/j.pocean.2015.08.009, 2015.
Tuerena, R. and Ganeshram, R.: Nitrate isotope measurements from CTD niskin depth profiles from cruise JR17005 in the Fram Strait during May–June 2018, National Oceanography Centre 2022 [data set], https://doi.org/10.5285/b93fb7c0-110e-2470-e053-6c86abc05d60, 2021.
Tuerena, R. E., Ganeshram, R. S., Geibert, W., Fallick, A. E., Dougans, J.,
Tait, A., Henley, S. F., and Woodward, E. M. S.: Nutrient cycling in the
Atlantic basin: The evolution of nitrate isotope signatures in water masses,
Global Biogeochem. Cy., 29, 1830–1844, https://doi.org/10.1002/2015GB005164, 2015.
Tuerena, R. E., Hopkins, J., Buchanan, P. J., Ganeshram, R. S., Norman, L.,
Von Appen, W.-J., Tagliabue, A., Doncila, A., Graeve, M., Ludwichowski, K.,
Dodd, P. A., de la Vega, C., Salter, I., and Mahaffey, C.: An Arctic strait
of two halves: The changing dynamics of nutrient uptake and limitation
across the Fram Strait, Global Biogeochem. Cy., 35, e2021GB006961, https://doi.org/10.1029/2021gb006961,
2021a.
Tuerena, R. E., Hopkins, J., Ganeshram, R. ., Norman, L., De La Vega, C.,
Jeffreys, R., and Mahaffey, C.: Nitrate assimilation and regeneration in the
Barents Sea: Insights from nitrate isotopes, Biogeosciences, 18,
637–653, https://doi.org/10.5194/bg-18-637-2021, 2021b.
Tuerena, R. E., Mahaffey, C., Henley, S. F., de la Vega, C., Norman, L.,
Brand, T., Sanders, T., Debyser, M., Dähnke, K., Braun, J., and März,
C.: Nutrient pathways and their susceptibility to past and future change in
the Eurasian Arctic Ocean, Ambio, 51, 355–369, https://doi.org/10.1007/s13280-021-01673-0,
2021c.
Varela, D., Brzezinski, M., Beucher, C., Jones, J., Giesbrecht, K., Lansard, B., and Mucci, A.: Heavy silicon isotopic composition of silicic
acid and biogenic silica in Arctic waters over the Beaufort shelf and the
Canada Basin, Global Biogeochem. Cy., 30, 804–824,
2016.
Varela, D. E., Pride, C. J., and Brzezinski, M. A.: Biological fractionation
of silicon isotopes in Southern Ocean surface waters, Global Biogeochem.
Cy., 18, GB1047, https://doi.org/10.1029/2003GB002140, 2004.
Ward, J. P. J., Hendry, K. R., Arndt, S., Faust, J. C., Freitas, F. S., Henley, S. F., Krause, J. W., März, C., Tessin, A. C., and Airs, R. L.: Benthic silicon cycling in the Arctic Barents Sea: a reaction–transport model study, Biogeosciences, 19, 3445–3467, https://doi.org/10.5194/bg-19-3445-2022, 2022a.
Ward, J. P. J., Hendry, K. R., Arndt, S., Faust, J. C., Freitas, F. S.,
Henley, S. F., Krause, J. W., März, C., Ng, H. C., Pickering, R. A., and
Tessin, A. C.: Stable Silicon Isotopes Uncover a Mineralogical Control on
the Benthic Silicon Cycle in the Arctic Barents Sea, Geochim. Cosmochim.
Ac., 329, 206–230, https://doi.org/10.1016/j.gca.2022.05.005, 2022b.
Weigand, M. A., Foriel, J., Barnett, B., Oleynik, S., and Sigman, D. M.:
Updates to instrumentation and protocols for isotopic analysis of nitrate by
the denitrifier method, Rapid Commun. Mass Spectrom., 30, 1365–1383,
https://doi.org/10.1002/rcm.7570, 2016.
Woodgate, R. A.: Increases in the Pacific inflow to the Arctic from 1990 to
2015, and insights into seasonal trends and driving mechanisms from
year-round Bering Strait mooring data, Prog. Oceanogr., 160,
124–154, https://doi.org/10.1016/j.pocean.2017.12.007, 2018.
Yamamoto-Kawai, M., Carmack, E., and McLaughlin, F.: Nitrogen balance and
Arctic throughflow, Nature, 443, C01007, https://doi.org/10.1038/443043a, 2006.
Yool, A., Popova, E. E., and Coward, A. C.: Future change in ocean
productivity: Is the Arctic the new Atlantic, J. Geophys. Res.-Ocean.,
120, 7771–7790, https://doi.org/10.1002/2015JC011167, 2015.
Young, E. D., Galy, A., and Nagahara, H.: Kinetic and equilibrium
mass-dependent isotope fractionation laws in nature and their geochemical
and cosmochemical significance, Geochim. Cosmochim. Ac., 66, 1095–1104,
https://doi.org/10.1016/S0016-7037(01)00832-8, 2002.
Zhang, S. M., Mu, C. C., Li, Z. L., Dong, W. W., Wang, X. Y., Streletskaya,
I., Grebenets, V., Sokratov, S., Kizyakov, A., and Wu, X. D.: Export of
nutrients and suspended solids from major Arctic rivers and their response
to permafrost degradation, Adv. Clim. Chang. Res., 12, 466–474,
https://doi.org/10.1016/j.accre.2021.06.002, 2021.
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.
We focus on the exchange of key nutrients for algae production between the Arctic and Atlantic...
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