Moreau, SebastienHattermann, ToreDe Steur, LauraKauko, Hanna M.Ahonen, HeidiArdelan, MuratAssmy, PhilippChierici, MelissaDescamps, SebastienDinter, TilmanFalkenhaug, ToneFransson, AgnetaGrønningsæter, EirikHallfredsson, Elvar H.Huhn, OliverLebrun, AnaisLowther, AndrewLübcker, NicoMonteiro, PedroPeeken, IlkaRoychoudhury, Alakendra N.Rożanska, MagdalenaRyan-Keogh, ThomasSanchez, NicolasSingh, AsmitaSimonsen, Jan HenrikSteiger, NadineThomalla, Sandy J.Van Tonder, AndréWiktor, Jozef M.Steen, Harald2024-10-292024-10-292023-03-09Moreau, S., Hattermann, T., De Steur, L. et al. 2023, 'Wind-driven upwelling of iron sustains dense blooms andT food webs in the eastern Weddell Gyre', Nature Communications, vol. 14, art. 1303, pp. 1-12. https://DOI.org/10.1038/s41467-023-36992-1.2041-172310.1038/s41467-023-36992-1http://hdl.handle.net/2263/98818DATA AVAILABILITY : The Seaglider, the biogeochemical and the taxonomical data from the scientific campaign can be found at the Norwegian Polar Data Centre (Norwegian Polar Institute): https://data.npolar.no/dataset/ ab96f43d-b813-4457-a466-6982c2c60a6b, https://data.npolar.no/ dataset/28fbddd2-0fb2-41c9-9f42-60146e28617f and https:// data.npolar.no/dataset/283e500c-732b-4f9b-a48a-3bc4990e3f55. In addition, themarine birds and mammals distribution data can be found at https://data.npolar.no/dataset/5168ad7f-4733-45fd-87bd- 4c4c4c217876. Atmospheric reanalyses can be obtained from https://www.ecmwf.int/en/forecasts/datasets/reanalysis-datasets/ era-interim. Satellite derived ocean color is available at https:// oceandata.sci.gsfc.nasa.gov/ and https://www.eumetsat.int/oceancolour- services. Satellite derived sea ice concentration is available at http://nsidc.org. The SOCCOM data are available at https:// soccom.princeton.edu. The GLODAP Version 2 data product can be obtained from https://www.glodap.info/. Bird tracking data (2012- 2016) can be found at https://www.datarepository.movebank.org/ handle/10255/move.566.DATA ANALYSIS : Data analyseswere conductedwithMatlab R2019b. Allmapswere built on QGIS (v. 3.20.0) and using them_map package as downloaded from https://www.eoas.ubc.ca/~rich/map.html in November 2021.The Southern Ocean is a major sink of anthropogenic CO2 and an important foraging area for top trophic level consumers. However, iron limitation sets an upper limit to primary productivity. Here we report on a considerably dense late summer phytoplankton bloom spanning 9000 km2 in the open ocean of the eastern Weddell Gyre. Over its 2.5 months duration, the bloom accumulated up to 20gCm−2 of organic matter, which is unusually high for Southern Ocean openwaters.We show that, over 1997–2019, this open ocean bloomwas likely driven by anomalies in easterly winds that push sea ice southwards and favor the upwelling of Warm Deep Water enriched in hydrothermal iron and, possibly, other iron sources. This recurring open ocean bloom likely facilitates enhanced carbon export and sustains high standing stocks of Antarctic krill, supporting feeding hot spots for marine birds and baleen whales.en© The Author(s) 2023. This article is licensed under a Creative Commons Attribution 4.0 International License.Iron homeostasisEastern Weddell GyreWindsSDG-14: Life below waterWhalesArticle