Pabi, S., Van Dijken, G. L. & Arrigo, K. R. Primary production in the Arctic Ocean, 1998–2006. J. Geophys. Res. 113, 1998–2006 (2008).
Uitz, J., Claustre, H., Gentili, B. & Stramski, D. Phytoplankton class-specific primary production in the world’s oceans: Seasonal and interannual variability from satellite observations. Global Biogeochemical Cycles 24, GB3016 (2010).
Arrigo, K. R. & van Dijken, G. L. Continued increases in Arctic Ocean primary production. Prog. Oceanogr. 136, 60–70 (2015).
Moore, C. M. et al. Processes and patterns of oceanic nutrient limitation. Nat. Geosci. 6, 701–710 (2013).
de Baar, H. J. W. et al. Importance of iron for plankton blooms and carbon dioxide drawdown in the Southern Ocea. Nature 373, 412–415 (1995).
Tremblay, J. -É & Gagnon, J. The effects of irradiance and nutrient supply on the productivity of Arctic waters: a perspective on climate change. In Influence of Climate Change on the Changing Arctic and Sub-Arctic Conditions (eds Nihoul, J. C. J. & Kostianoy, A. G.) 73–89 (Springer, Berlin, 2009).
De Jong, J. T. M. et al. Sources and fluxes of dissolved iron in the Bellingshausen Sea (West Antarctica): the importance of sea ice, icebergs and the continental margin. Mar. Chem. 177, 518–535 (2015).
Popova, E. E. et al. What controls primary production in the Arctic Ocean? Results from an intercomparison of five general circulation models with biogeochemistry. J. Geophys. Res. Ocean. 117, (2012).
Nielsdóttir, M. C., Moore, C. M., Sanders, R., Hinz, D. J. & Achterberg, E. P. Iron limitation of the postbloom phytoplankton communities in the Iceland Basin. Glob. Biogeochem. Cycles 23, 1–13 (2009).
Ryan-Keogh, T. J. et al. Spatial and temporal development of phytoplankton iron stress in relation to bloom dynamics in the high-latitude North Atlantic Ocean. Limnol. Oceanogr. 58, 533–545 (2013).
Taylor, R. L. et al. Colimitation by light, nitrate, and iron in the Beaufort Sea in late summer. J. Geophys. Res. Ocean. 118, 3260–3277 (2013).
Findlay, H. S. et al. Late winter biogeochemical conditions under sea ice in the Canadian High Arctic. Polar Res. 34, 24170 (2015).
Mills, M. M. et al. Nitrogen limitation of the summer phytoplankton and heterotrophic prokaryote communities in the Chukchi Sea. Front. Mar. Sci. 5, 1–22 (2018).
Hopwood, M. J. et al. Non-linear response of summertime marine productivity to increased meltwater discharge around Greenland. Nat. Commun. 9, 1–9 (2018).
Codispoti, L. A. et al. Synthesis of primary production in the Arctic Ocean: III. Nitrate and phosphate based estimates of net community production. Prog. Oceanogr. 110, 126–150 (2013).
Schauer, U. et al. Variation of measured heat flow through the Fram Strait between 1997 and 2006. In Arctic-Subarctic Ocean Fluxes: Defining the Role of the Northern Seas in Climate (eds Dickson, R. R. et al.) 65–85 (Springer, Berlin, 2008).
Mouginot, J. et al. Fast retreat of Zachariæ Isstrøm, northeast Greenland. Science (80-, ) 350, 1357–1361 (2015).
Smedsrud, L. H., Halvorsen, M. H., Stroeve, J. C., Zhang, R. & Kloster, K. Fram Strait sea ice export variability and September Arctic sea ice extent over the last 80 years. Cryosphere 11, 65–79 (2017).
Rijkenberg, M. J. A., Slagter, H. A., Rutgers Van Der Loeff, M., Ooijen, J. Van. & Gerringa, L. J. A. Dissolved Fe in the deep and upper Arctic Ocean with a focus on Fe limitation in the Nansen Basin. Front. Mar. Sci. 5, 88 (2018).
de Steur, L. et al. Freshwater fluxes in the East Greenland Current: a decade of observations. Geophys. Res. Lett. 36, 1–5 (2009).
Beszczynska-Möller, A., Woodgate, R. A., Lee, C., Melling, H. & Karcher, M. A synthesis of exchanges through the main oceanic gateways to the Arctic Ocean. Oceanography 24, 82–99 (2011).
Rudels, B. Arctic ocean circulation. in Encyclopedia of Ocean Sciences 262–277 (Elsevier Inc., 2019). https://doi.org/10.1016/B978-0-12-409548-9.11209-6
Laukert, G. et al. Ocean circulation and freshwater pathways in the Arctic Mediterranean based on a combined Nd isotope, REE and oxygen isotope section across Fram Strait. Geochim. Cosmochim. Acta 202, 285–309 (2017).
Michel, C. et al. Arctic Ocean outflow shelves in the changing Arctic: a review and perspectives. Prog. Oceanogr. 139, 66–88 (2015).
Rudels, B. et al. 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 (2005).
Lalande, C. et al. Lateral supply and downward export of particulate matter from upper waters to the seafloor in the deep eastern Fram Strait. Deep. Res. Part I Oceanogr. Res. Pap. 114, 78–89 (2016).
Norwegian Polar Institute. Sea ice extent in the Fram Strait in September, 1979–2018. Environmental Monitoring of Svalbard and Jan Mayen (MOSJ) (2020). https://www.mosj.no/en/climate/ocean/sea-ice-extent-barents-sea-fram-strait.html. Accessed 10th January 2020.
de Steur, L., Peralta-Ferriz, C. & Pavlova, O. Freshwater export in the East Greenland current freshens the North Atlantic. Geophys. Res. Lett. 45, 13359–13366 (2018).
Marnela, M., Rudels, B., Houssais, M.-N., Beszczynska-Möller, A. & Eriksson, P. B. Recirculation in the Fram Strait and transports of water in and north of the Fram Strait derived from CTD data. Ocean Sci. 9, 499–519 (2013).
Beszczynska-Möller, A., Fahrbach, E., Schauer, U. & Hansen, E. Variability in Atlantic water temperature and transport at the entrance to the Arctic Ocean, 1997–2010. ICES J. Mar. Sci. 69, 852–863 (2012).
de Steur, L., Hansen, E., Mauritzen, C., Beszczynska-Möller, A. & Fahrbach, E. Impact of recirculation on the East Greenland Current in Fram Strait: Results from moored current meter measurements between 1997 and 2009. Deep. Res. Part I Oceanogr. Res. Pap. 92, 26–40 (2014).
Grasshoff, K., Kremlingl, K. & Ehrhardt, M. Methods of Seawater Analysis (Wiley, Hoboken, 1999). https://doi.org/10.1002/9783527613984.
Cutter, G. et al. Sampling and Sample-handling Protocols for GEOTRACES Cruises. (2014).
Rapp, I., Schlosser, C., Rusiecka, D., Gledhill, M. & Achterberg, E. P. Automated preconcentration of Fe, Zn, Cu, Ni, Cd, Pb Co, and Mn in seawater with analysis using high-resolution sector field inductively-coupled plasma mass spectrometry. Anal. Chim. Acta 976, 1–13 (2017).
Moore, C. M. Diagnosing oceanic nutrient deficiency. Philos. Trans. R. Soc. A Math. Phys. Eng. Sci. 374, 20150290 (2016).
Browning, T. J. et al. Nutrient co-limitation at the boundary of an oceanic gyre. Nature 551, 242–246 (2017).
Achterberg, E. P. et al. Natural iron fertilization by the Eyjafjallajökull volcanic eruption. Geophys. Res. Lett. 40, 921–926 (2013).
Welschmeyer, N. A. Fluorometric analysis of chlorophyll a in the presence of chlorophyll b and pheopigments. Limnol. Oceanogr. 39, 1985–1992 (1994).
Van Heukelem, L. & Thomas, C. S. Computer-assisted high-performance liquid chromatography method development with applications to the isolation and analysis of phytoplankton pigments. J. Chromatogr. A 910, 31–49 (2001).
Mackey, M. D., Mackey, D. J., Higgins, H. W. & Wright, S. W. CHEMTAX – a program for estimating class abundances from chemical markers: application to HPLC measurements of phytoplankton. Mar. Ecol. Prog. Ser. 144, 265–283 (1996).
Coupel, P. et al. Pigment signatures of phytoplankton communities in the Beaufort Sea. Biogeosciences 12, 991–1006 (2015).
Hong, C. N. et al. Sediment efflux of silicon on the Greenland margin and implications for the marine silicon cycle. Earth Planet. Sci. Lett. 529, 115877 (2020).
Tonnard, M. et al. Dissolved iron in the North Atlantic Ocean and Labrador Sea along the GEOVIDE section (GEOTRACES section GA01). Biogeosciences 17, 917–943 (2020).
Colombo, M., Jackson, S. L., Cullen, J. T. & Orians, K. J. Dissolved iron and manganese in the Canadian Arctic Ocean: On the biogeochemical processes controlling their distributions. Geochim. Cosmochim. Acta (2020). (in press).
Ardiningsih, I. et al. Natural Fe-binding organic ligands in Fram Strait and over the Northeast Greenland shelf. Mar. Chem. 224, (2020).
Le Moigne, F. A. C. et al. Sequestration efficiency in the iron-limited North Atlantic: implications for iron supply mode to fertilized blooms. Geophys. Res. Lett. 41, 4619–4627 (2014).
Beszczynska-Möller, A. & Wisotzki, A. Physical oceanography during POLARSTERN cruise ARK-XXIII/2. Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, PANGAEA (2010). https://doi.org/10.1594/PANGAEA.733424.
Kattner, G. & Ludwichowski, K.-U. Inorganic nutrients measured on water bottle samples during POLARSTERN cruise ARK-XXIII/2. Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, PANGAEA (2014). https://doi.org/10.1594/PANGAEA.832402.
Randelhoff, A., Fer, I., Sundfjord, A., Tremblay, J. -É & Reigstad, M. Vertical fluxes of nitrate in the seasonal nitracline of the Atlantic sector of the Arctic Ocean. J. Geophys. Res. Ocean. 121, 3010–3028 (2016).
Achterberg, E. P. et al. Iron biogeochemistry in the high latitude North Atlantic ocean. Sci. Rep. 8, 1–15 (2018).
Torres-Valdés, S. et al. Export of nutrients from the Arctic Ocean. J. Geophys. Res. 118, 1625–1644 (2013).
Ooijen, J. Van, Rijkenberg, M. J. A., Gerringa, L. J. A., Rabe, B. & van der Loeff, M. R. Inorganic nutrients measured on water bottle samples during POLARSTERN cruise PS94 (ARK-XXIX/3). (2016). https://doi.org/10.1594/PANGAEA.868396
Slagter, H. A. et al. Organic Fe speciation in the Eurasian Basins of the Arctic Ocean and its relation to terrestrial DOM. Mar. Chem. 197, 11–25 (2017).
Gerringa, L. J. A., Rijkenberg, M. J. A. & Slagter, H. A. Dissolved iron measured on board with Flow injection analysis and iron-binding dissolved organic ligands from Ultra Clean CTD collected depth profiles during GEOTRACES PS94 Arctic cruise on Polarstern. (2018). https://doi.org/10.1594/PANGAEA.890975
Krawczyk, D. W. et al. Seasonal succession, distribution, and diversity of planktonic protists in relation to hydrography of the Godthåbsfjord system (SW Greenland). Polar Biol. 41, 2033–2052 (2018).
Meire, L. et al. High export of dissolved silica from the Greenland Ice Sheet. Geophys. Res. Lett. 43, 9173–9182 (2016).
Nöthig, E.-M. et al. Summertime plankton ecology in Fram Strait: a compilation of long- and short-term observations. Polar Res. 34, 1–18 (2015).
Moore, C. M. et al. Relative influence of nitrogen and phosphorus availability on phytoplankton physiology and productivity in the oligotrophic sub-tropical North Atlantic Ocean. Limnol. Oceanogr. 53, 291–305 (2008).
Browning, T. J. et al. Nutrient co-limitation at the boundary of an oceanic gyre_Supplementary Material. Nature 551, 242–246 (2017).
Kattner, G. & Budéus, G. Nutrient status of the Northeast Water Polynya. J. Mar. Syst. 10, 185–197 (1997).
Smith, R. E. H., Gosselin, M. & Taguchi, S. The influence of major inorganic nutrients on the growth and physiology of high arctic ice algae. J. Mar. Syst. 11, 63–70 (1997).
Maestrini, S. Y., Rochet, M., Legendre, L. & Demers, S. Nutrient limitation of the bottom-ice microalgal biomass (southeastern Hudson Bay, Canadian Arctic). Lim 31, 969–982 (1986).
Ortega-Retuerta, E., Jeffrey, W. H., Ghiglione, J. F. & Joux, F. Evidence of heterotrophic prokaryotic activity limitation by nitrogen in the Western Arctic Ocean during summer. Polar Biol. 35, 785–794 (2012).
Mann, E. L. & Chisholm, S. W. Iron limits the cell division rate of Prochlorococcus in the eastern equatorial Pacific. Limnol. Oceanogr. 45, 1067–1076 (2000).
Vernet, M. et al. Influence of phytoplankton advection on the productivity along the Atlantic water inflow to the Arctic Ocean. Front. Mar. Sci. 6(583), 1–18 (2019).
Moore, C. M. et al. Iron limits primary productivity during spring bloom development in the central North Atlantic. Glob. Chang. Biol. 12, 626–634 (2006).
Browning, T. J. et al. Nutrient regulation of late spring phytoplankton blooms in the midlatitude North Atlantic. Limnol. Oceanogr. 9999, 1–13 (2019).
Blain, S. et al. Availability of iron and major nutrients for phytoplankton in the northeast Atlantic Ocean. Limnol. Oceanogr. 49, 2095–2104 (2004).
Boyd, P. W. & Ellwood, M. J. The biogeochemical cycle of iron in the ocean. Nat. Geosci. 3, 675–682 (2010).
Twining, B. S. & Baines, S. B. The trace metal composition of marine phytoplankton. Ann. Rev. Mar. Sci. 5, 191–215 (2013).
Saito, M. A. et al. Multiple nutrient stresses at intersecting Pacific Ocean biomes detected by protein biomarkers. Science (80-. ) 345, 1173–1177 (2014).
Ward, B. A., Dutkiewicz, S., Moore, C. M. & Follows, M. J. Iron, phosphorus, and nitrogen supply ratios define the biogeography of nitrogen fixation. Limnol. Oceanogr. 58, 2059–2075 (2013).
Hattermann, T., Isachsen, P. E., Von Appen, W. J., Albretsen, J. & Sundfjord, A. Eddy-driven recirculation of Atlantic Water in Fram Strait. Geophys. Res. Lett. 43, 3406–3414 (2016).
Klunder, M. B. et al. Dissolved iron in the Arctic shelf seas and surface waters of the central Arctic Ocean: impact of Arctic river water and ice-melt. J. Geophys. Res. Ocean. 117, 1–18 (2012).
Charette, M. A. et al. The Transpolar Drift as a Source of Riverine and Shelf-Derived Trace Elements to the Central Arctic Ocean. J. Geophys. Res. Ocean. 125, e2019JC015920 (2020).
Yamamoto-Kawai, M., Carmack, E. & McLaughlin, F. Nitrogen balance and Arctic throughflow. Nature 443, 43 (2006).
Rijkenberg, M. J. A. et al. The distribution of dissolved iron in the West Atlantic Ocean. PLoS ONE 9, 1–14 (2014).
de Boyer Montégut, C., Madec, G., Fischer, A. S., Lazar, A. & Iudicone, D. Mixed layer depth over the global ocean: an examination of profile data and a profile-based climatology. J. Geophys. Res. Ocean. 109, 1–20 (2004).
Randelhoff, A., Sundfjord, A. & Reigstad, M. Seasonal variability and fluxes of nitrate in the surface waters over the Arctic shelf slope. Geophys. Res. Lett. 42, 3442–3449 (2015).
Randelhoff, A. et al. Pan-Arctic ocean primary production constrained by turbulent nitrate fluxes. Front. Mar. Sci. 7, 1–15 (2020).
Rafter, P. A., Sigman, D. M. & Mackey, K. R. M. Recycled iron fuels new production in the eastern equatorial Pacific Ocean. Nat. Commun. 8, 1100 (2017).
Stohl, A. et al. Arctic smoke: record high air pollution levels in the European Arctic due to agricultural fires in Eastern Europe in spring 2006. Atmos. Chem. Phys. 7, 511–534 (2007).
Marsay, C. M. et al. Concentrations, provenance and flux of aerosol trace elements during US GEOTRACES Western Arctic cruise GN01. Chem. Geol. 502, 1–14 (2018).
Conca, E. et al. Source identification and temporal evolution of trace elements in PM10 collected near to Ny-Ålesund (Norwegian Arctic). Atmos. Environ. 203, 153–165 (2019).
Kadko, D. et al. The residence times of trace elements determined in the surface Arctic Ocean during the 2015 US Arctic GEOTRACES expedition. Mar. Chem. 208, 56–69 (2019).
Wehrmann, L. M. et al. Iron and manganese speciation and cycling in glacially influenced high-latitude fjord sediments (West Spitsbergen, Svalbard): evidence for a benthic recycling-transport mechanism. Geochim. Cosmochim. Acta 141, 628–655 (2014).
Bown, J. et al. Evidences of strong sources of DFe and DMn in Ryder Bay, Western Antarctic Peninsula. Philos. Trans. R. Soc. A Math. Phys. Eng. Sci. 376, 20170172 (2018).
Bucciarelli, E., Blain, S. & Tréguer, P. Iron and manganese in the wake of the Kerguelen Islands (Southern Ocean). Mar. Chem. 73, 21–36 (2001).
Nishino, S. et al. Enhancement/Reduction of biological pump depends on ocean circulation in the sea-ice reduction regions of the Arctic Ocean. J. Oceanogr. 67, 305–314 (2011).
Kipp, L. E., Charette, M. A., Moore, W. S., Henderson, P. B. & Rigor, I. G. Increased fluxes of shelf-derived materials to the central arctic ocean. Sci. Adv. 4, 1–10 (2018).
Mayot, N. et al. Springtime export of Arctic Sea ice influences phytoplankton production in the Greenland Sea. J. Geophys. Res. Ocean. 125, 1–16 (2020).
Randelhoff, A. et al. The evolution of light and vertical mixing across a phytoplankton ice-edge bloom. Elem. Sci. Anthr. 7, 1–19 (2019).
Kahru, M., Brotas, V., Manzano-Sarabia, M. & Mitchell, B. G. Are phytoplankton blooms occurring earlier in the Arctic?. Glob. Chang. Biol. 17, 1733–1739 (2011).
Ardyna, M. et al. Environmental drivers of under-ice phytoplankton bloom dynamics in the Arctic Ocean. Elem. Sci. Anthr. 8, 30 (2020).
Tremblay, J. É et al. Vertical stability and the annual dynamics of nutrients and chlorophyll fluorescence in the coastal, southeast Beaufort Sea. J. Geophys. Res. Ocean. 113, 1–14 (2008).
Castro de la Guardia, L. et al. Assessing the role of high-frequency winds and sea ice loss on arctic phytoplankton blooms in an ice-ocean-biogeochemical model. J. Geophys. Res. Biogeosci. 124, 2728–2750 (2019).
Ardyna, M. et al. Recent Arctic Ocean sea ice loss triggers novel fall phytoplankton blooms. Geophys. Res. Lett. 41, 6207–6212 (2014).
Wang, Q. et al. Intensification of the Atlantic Water supply to the Arctic Ocean through Fram Strait induced by Arctic sea ice decline. Geophys. Res. Lett. 47, e2019GL086682 (2020).
Arrigo, K. R., van Dijken, G. & Pabi, S. Impact of a shrinking Arctic ice cover on marine primary production. Geophys. Res. Lett. 35, 1–6 (2008).
Carmack, E. C., Macdonald, R. W. & Steve, J. Phytoplankton productivity on the Canadian Shelf of the Beaufort Sea. Mar. Ecol. Prog. Ser. 277, 37–50 (2004).
Lasternas, S. & Agustí, S. Phytoplankton community structure during the record Arctic ice-melting of summer 2007. Polar Biol. 33, 1709–1717 (2010).
Harding, K. et al. Symbiotic unicellular cyanobacteria fix nitrogen in the Arctic Ocean. Proc. Natl. Acad. Sci. 115, 13371–13375 (2018).
Sipler, R. E. et al. Preliminary estimates of the contribution of Arctic nitrogen fixation to the global nitrogen budget. Limnol. Oceanogr. 2, 159–166 (2017).
Zehr, J. P. & Kudela, R. M. Nitrogen cycle of the open ocean: from genes to ecosystems. Annu. Rev. Mar. Sci. 3, 197–225 (2011).
Acker, J. G. & Leptoukh, G. Online analysis enhances use of NASA Earth Science Data. Eos (Washington, DC) 88, 14–17 (2007).
Schaffer, J. et al. A global, high-resolution data set of ice sheet topography, cavity geometry, and ocean bathymetry. Earth Syst. Sci. Data 8, 543–557 (2016).