Articles | Volume 19, issue 6
https://doi.org/10.5194/tc-19-2247-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/tc-19-2247-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
26 Jun 2025
Research article |
| 26 Jun 2025
| 26 Jun 2025
Antarctic subglacial trace metal mobility linked to climate change across termination III
Gavin Piccione
CORRESPONDING AUTHOR
Department of Earth, Environmental, and Planetary Science, Brown University, Providence, 02912, USA
Terrence Blackburn
Earth and Planetary Sciences, University of California Santa Cruz, Santa Cruz, 95064, USA
Paul Northrup
Department of Geosciences, Stony Brook University, Stony Brook, 11794, USA
Slawek Tulaczyk
Earth and Planetary Sciences, University of California Santa Cruz, Santa Cruz, 95064, USA
Troy Rasbury
Department of Geosciences, Stony Brook University, Stony Brook, 11794, USA
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Cited articles
Alderkamp, A. C., Mills, M. M., van Dijken, G. L., Laan, P., Thuróczy, C. E., Gerringa, L. J. A., de Baar, H. J. W., Payne, C. D., Visser, R. J. W., Buma, A. G. J., and Arrigo, K. R.: Iron from melting glaciers fuels phytoplankton blooms in the Amundsen Sea (Southern Ocean): Phytoplankton characteristics and productivity, Deep-Sea Res. Pt. II, 71–76, 32–48, https://doi.org/10.1016/j.dsr2.2012.03.005, 2012.
Annett, A. L., Skiba, M., Henley, S. F., Venables, H. J., Meredith, M. P., Statham, P. J., and Ganeshram, R. S.: Comparative roles of upwelling and glacial iron sources in Ryder Bay, coastal western Antarctic Peninsula, Mar. Chem., 176, 21–33, https://doi.org/10.1016/j.marchem.2015.06.017, 2015.
Balaguer, J., Koch, F., Hassler, C., and Trimborn, S.: Iron and manganese co-limit the growth of two phytoplankton groups dominant at two locations of the Drake Passage, Commun. Biol., 5, 207, https://doi.org/10.1038/s42003-022-03148-8, 2022.
Blackburn, T., Edwards, G. H., Tulaczyk, S., Scudder, M., Piccione, G., Hallet, B., McLean, N., Zachos, J. C., Cheney, B., and Babbe, J. T.: Ice retreat in Wilkes Basin of East Antarctica during a warm interglacial, Nature, 583, 554–559, https://doi.org/10.1038/s41586-020-2484-5, 2020.
Boothman, W. S., Coiro, L., and Moran, S. B.: Molybdenum accumulation in sediments: A quantitative indicator of hypoxic water conditions in Narragansett Bay, RI, Estuar. Coast. Shelf Sci., 267, 107778, https://doi.org/10.1016/j.ecss.2022.107778, 2022.
Browning, T. J., Achterberg, E. P., Engel, A., and Mawji, E.: Manganese co-limitation of phytoplankton growth and major nutrient drawdown in the Southern Ocean, Nat. Commun., 12, 884, https://doi.org/10.1038/s41467-021-21122-6, 2021.
Calvert, S. E. and Pedersen, T. F.: Geochemistry of Recent oxic and anoxic marine sediments: Implications for the geological record, Mar. Geol., 113, 67–88, https://doi.org/10.1016/0025-3227(93)90150-T, 1993.
Cheng, H., Edwards, R. L., Hoff, J., Gallup, C. D., Richards, D. A., and Asmerom, Y.: The half-lives of uranium-234 and thorium-230, Chem. Geol., 169, 17–33, 2000.
Christner, B. C., Priscu, J. C., Achberger, A. M., Barbante, C., Carter, S. P., Christianson, K., Michaud, A. B., Mikucki, J. A., Mitchell, A. C., Skidmore, M. L., Vick-Majors, T. J., Adkins, W. P., Anandakrishnan, S., Beem, L., Behar, A., Beitch, M., Bolsey, R., Branecky, C., Fisher, A., Foley, N., Mankoff, K. D., Sampson, D., Tulaczyk, S., Edwards, R., Kelley, S., Sherve, J., Fricker, H. A., Siegfried, S., Guthrie, B., Hodson, T., Powell, R., Scherer, R., Horgan, H., Jacobel, R., McBryan, E., and Purcell, A.: A microbial ecosystem beneath the West Antarctic ice sheet, Nature, 512, 310–313, https://doi.org/10.1038/nature13667, 2014.
Coplen, T. B., Brand, W. A., Gehre, M., Grhning, M., Meljer, L. H. A. J., Toman, B., and Verkouteren, R. M.: New Guidelines for δ13C Measurements, Anal. Chem., 78, 2439–2441, 2006.
Dawson, E. J., Schroeder, D. M., Chu, W., Mantelli, E., and Seroussi, H.: Ice mass loss sensitivity to the Antarctic ice sheet basal thermal state, Nat. Commun., 13, 4957, https://doi.org/10.1038/s41467-022-32632-2, 2022.
Death, R., Wadham, J. L., Monteiro, F., Le Brocq, A. M., Tranter, M., Ridgwell, A., Dutkiewicz, S., and Raiswell, R.: Antarctic ice sheet fertilises the Southern Ocean, Biogeosciences, 11, 2635–2643, https://doi.org/10.5194/bg-11-2635-2014, 2014.
Dold, B., Aguilera, a, Cisternas, M. E., Bucchi, F., and Amils, R.: Sources for Iron Cycling in the Southern Ocean, Environ. Sci. Technol., 47, 6129–6136, 2013.
Dromgoole, E. L. and Walter, L. M.: Iron and manganese incorporation into calcite: Effects of growth kinetics, temperature and solution chemistry, Chem. Geol., 81, 311–336, https://doi.org/10.1016/0009-2541(90)90053-A, 1990.
Faucher, B., Lacelle, D., Marsh, N. B., Jasperse, L., Clark, I. D., and Andersen, D. T.: Glacial lake outburst floods enhance benthic microbial productivity in perennially ice-covered Lake Untersee (East Antarctica), Commun. Earth Environ., 2, 211, https://doi.org/10.1038/s43247-021-00280-x, 2021.
Forsch, K. O., Hahn-Woernle, L., Sherrell, R. M., Roccanova, V. J., Bu, K., Burdige, D., Vernet, M., and Barbeau, K. A.: Seasonal dispersal of fjord meltwaters as an important source of iron and manganese to coastal Antarctic phytoplankton, Biogeosciences, 18, 6349–6375, https://doi.org/10.5194/bg-18-6349-2021, 2021.
Frisia, S., Weyrich, L. S., Hellstrom, J., Borsato, A., Golledge, N. R., Anesio, A. M., Bajo, P., Drysdale, R. N., Augustinus, P. C., Rivard, C., and Cooper, A.: The influence of Antarctic subglacial volcanism Maximum, Nat. Commun., 8, 15425, https://doi.org/10.1038/ncomms15425, 2017.
Gaillou, E., Delaunay, A., Rondeau, B., Bouhnik-le-Coz, M., Fritsch, E., Cornen, G., and Monnier, C.: The geochemistry of gem opals as evidence of their origin, Ore Geol. Rev., 34, 113–126, https://doi.org/10.1016/j.oregeorev.2007.07.004, 2008.
Gerringa, L. J. A., Alderkamp, A. C., Laan, P., Thuróczy, C. E., De Baar, H. J. W., Mills, M. M., van Dijken, G. L., Haren, H. van, and Arrigo, K. R.: Iron from melting glaciers fuels the phytoplankton blooms in Amundsen Sea (Southern Ocean): Iron biogeochemistry, Deep-Sea Res. Pt. II, 71–76, 16–31, https://doi.org/10.1016/j.dsr2.2012.03.007, 2012.
Goodwin, I. D.: The nature and origin of a jokulhlaup near Casey Station, Antarctica, J. Glaciol., 34, 95–101, https://doi.org/10.1017/S0022143000009114, 1988.
Hamelin, B., Bard, E., Zindler, A., and Fairbanks, R. G.:
Hawkings, J. R., Wadham, J. L., Tranter, M., Raiswell, R., Benning, L. G., Statham, P. J., Tedstone, A., Nienow, P., Lee, K., and Telling, J.: Ice sheets as a significant source of highly reactive nanoparticulate iron to the oceans, Nat. Commun., 5, 3929, https://doi.org/10.1038/ncomms4929, 2014.
Hawkings, J. R., Benning, L. G., Raiswell, R., Kaulich, B., Araki, T., Abyaneh, M., Stockdale, A., Koch-Müller, M., Wadham, J. L., and Tranter, M.: Biolabile ferrous iron bearing nanoparticles in glacial sediments, Earth Planet. Sci. Lett., 493, 92–101, https://doi.org/10.1016/j.epsl.2018.04.022, 2018.
Hawkings, J. R., Skidmore, M. L., Wadham, J. L., Priscu, J. C., Morton, P. L., and Hatton, J. E.: Enhanced trace element mobilization by Earth's ice sheets, P. Natl. Acad. Sci. USA, 117, 31648–316, https://doi.org/10.1073/pnas.2014378117, 2020.
Hayden, A.-M. and Dow, C. F.: Examining the effect of ice dynamic changes on subglacial hydrology through modelling of a synthetic Antarctic glacier, J. Glaciol., 69, 1846–1859, https://doi.org/10.1017/jog.2023.65, 2023.
Herraiz-Borreguero, L., Lannuzel, D., van der Merwe, P., Treverrow, A., and Pedro, J. B.: Large flux of iron from the Amery Ice Shelf marine ice to Prydz Bay, East Antarctica, J. Geophys. Res. Oceans, 121, 6009–6020, https://doi.org/10.1002/2016JC011687, 2016.
Hodson, A., Nowak, A., Sabacka, M., Jungblut, A., Navarro, F., Pearce, D., Ávila-Jiménez, M. L., Convey, P., and Vieira, G.: Climatically sensitive transfer of iron to maritime Antarctic ecosystems by surface runoff, Nat. Commun., 8, 14499, https://doi.org/10.1038/ncomms14499, 2017.
Jaccard, S. L., Galbraith, E. D., Martínez-Garciá, A., and Anderson, R. F.: Covariation of deep Southern Ocean oxygenation and atmospheric CO2 through the last ice age, Nature, 530, 207–210, https://doi.org/10.1038/nature16514, 2016.
Jiang, C. Z. and Tosca, N. J.: Fe(II)-carbonate precipitation kinetics and the chemistry of anoxic ferruginous seawater, Earth Planet. Sci. Lett., 506, 231–242, https://doi.org/10.1016/j.epsl.2018.11.010, 2019.
Jouzel, J., Masson-Delmotte, V., Cattani, O., Dreyfus, G., Falourd, S., Hoffmann, G., Minster, B., Nouet, J., Barnola, J. M., Chappellaz, J., Fischer, H., Gallet, J. C., Johnsen, S., Leuenberger, M., Loulergue, L., Luethi, D., Oerter, H., Parrenin, F., Raisbeck, G., Raynaud, D., Schilt, A., Schwander, J., Selmo, E., Souchez, R., Spahni, R., Stauffer, B., Steffensen, J. P., Stenni, B., Stocker, T. F., Tison, J. L., Werner, M., and Wolff, E. W.: Orbital and millennial antarctic climate variability over the past 800,000 years, Science, 317, 793–796, https://doi.org/10.1126/science.1141038, 2007.
Kassab, C. M., Licht, K. J., Petersson, R., Lindbäck, K., Graly, J. A., and Kaplan, M. R.: Formation and evolution of an extensive blue ice moraine in central Transantarctic Mountains, Antarctica, J. Glaciol., 66, 49–60, https://doi.org/10.1017/jog.2019.83, 2019.
Keller, B.: A Bayesian framework for integrated eruption age and age-depth modelling, OSF [software], https://doi.org/10.17605/OSF.IO/TQX3F, 2018.
Kontrec, J., Kralj, D., Brečević, L., Falini, G., Fermani, S., Noethig-Laslo, V., and Mirosavljević, K.: Incorporation of Inorganic Anions in Calcite, Eur. J. Inorg. Chem., 2004, 4579–4585, https://doi.org/10.1002/ejic.200400268, 2004.
Landschützer, P., Gruber, N., Haumann, F. A., Rödenbeck, C., Bakker, D. C. E., van Heuven, S., Hoppema, M., Metzl, N., Sweeney, C., Takahashi, T., Tilbrook, B., and Wanninkhof, R.: The reinvigoration of the Southern Ocean carbon sink, Science, 349, 1221–1224, https://doi.org/10.1126/science.aab2620, 2015.
Lee, Y. J., Reeder, R. J., Wenskus, R. W., and Elzinga, E. J.: Structural relaxation in the MnCO3–CaCO3 solid solution: A Mn K-edge EXAFS study, Phys. Chem. Miner., 29, 585–594, https://doi.org/10.1007/s00269-002-0274-2, 2002.
Lipenkov, V. Y. and Istomin, V. A.: On the stability of air clathrate hydrate crystals in subglacial lake Vostok, Antarctica, Mater Glyatsiol Issled, 91, 129–137, 2001.
Livingstone, S. J., Li, Y., Rutishauser, A., Sanderson, R. J., Winter, K., Mikucki, J. A., Björnsson, H., Bowling, J. S., Chu, W., Dow, C. F., Fricker, H. A., McMillan, M., Ng, F. S. L., Ross, N., Siegert, M. J., Siegfried, M., and Sole, A. J.: Subglacial lakes and their changing role in a warming climate, Nat. Rev. Earth Environ., 3, 106–124, https://doi.org/10.1038/s43017-021-00246-9, 2022.
Llubes, M., Lanseau, C., and Rémy, F.: Relations between basal condition, subglacial hydrological networks and geothermal flux in Antarctica, Earth Planet. Sci. Lett., 241, 655–662, https://doi.org/10.1016/j.epsl.2005.10.040, 2006.
Lyons, W. B., Mikucki, J. A., German, L. A., Welch, K. A., Welch, S. A., Gardner, C. B., Tulaczyk, S. M., Pettit, E. C., Kowalski, J., and Dachwald, B.: The Geochemistry of Englacial Brine From Taylor Glacier, Antarctica, J. Geophys. Res.-Biogeo., 124, 633–648, https://doi.org/10.1029/2018JG004411, 2019.
Martin, J. H.: Glacial-interglacial CO2 change: The Iron Hypothesis, Paleoceanography, 5, 1–13, https://doi.org/10.1029/PA005i001p00001, 1990.
Martínez-Garcia, A., Rosell-Melé, A., Jaccard, S. L., Geibert, W., Sigman, D. M., and Haug, G. H.: Southern Ocean dust-climate coupling over the past four million years, Nature, 476, 312–315, https://doi.org/10.1038/nature10310, 2011.
Martínez-García, A., Sigman, D. M., Ren, H., Anderson, R. F., Straub, M., Hodell, D. A., Jaccard, S. L., Eglinton, T. I., and Haug, G. H.: Iron fertilization of the subantarctic ocean during the last ice age, Science, 343, 1347–1350, https://doi.org/10.1126/science.1246848, 2014.
Michaud, A. B. and Priscu, J. C.: Sediment oxygen consumption in Antarctic subglacial environments, Limnol. Oceanogr., 68, 1557–1566, https://doi.org/10.1002/lno.12366, 2023.
Midgley, S. D., Taylor, J. O., Fleitmann, D., and Grau-Crespo, R.: Molybdenum and sulfur incorporation as oxyanion substitutional impurities in calcium carbonate minerals: A computational investigation, Chem. Geol., 553, 119796, https://doi.org/10.1016/j.chemgeo.2020.119796, 2020.
Mikucki, J. A., Pearson, A., Johnston, D. T., Turchyn, A. V., Farquhar, J., Schrag, D. P., Anbar, A. D., Priscu, J. C., and Lee, P. A.: A Contemporary Microbially Maintained Subglacial Ferrous “Ocean,” Science, 663, 397–401, 2009.
Mikucki, J. A., Auken, E., Tulaczyk, S., Virginia, R. A., Schamper, C., Sørensen, K. I., Doran, P. T., Dugan, H., and Foley, N.: Deep groundwater and potential subsurface habitats beneath an Antarctic dry valley, Nat. Commun., 6, 6831, https://doi.org/10.1038/ncomms7831, 2015.
Monien, D., Monien, P., Brünjes, R., Widmer, T., Kappenberg, A., Silva Busso, A. A., Schnetger, B., and Brumsack, H. J.: Meltwater as a source of potentially bioavailable iron to Antarctica waters, Antarct. Sci., 29, 277–291, https://doi.org/10.1017/S095410201600064X, 2017.
Northrup, P.: The TES beamline (8-BM) at NSLS-II: tender-energy spatially resolved X-ray absorption spectroscopy and X-ray fluorescence imaging, J. Synchrotron Radiat., 26, 2064–2074, https://doi.org/10.1107/S1600577519012761, 2019.
Ostermann, D. R. and Curry, W. B.: Calibration of stable isotopic data: An enriched δ18O standard used for source gas mixing detection and correction, Paleoceanography, 15, 353–360, https://doi.org/10.1029/1999PA000411, 2000.
Paton, C., Hellstrom, J., Paul, B., Woodhead, J., and Hergtb, J.: Iolite: Freeware for the visualisation and processing of mass spectrometric data, J. Anal. At. Spectrom., 26, 2508–2518, https://doi.org/10.1039/c1ja10172b, 2011.
Pattyn, F.: Antarctic subglacial conditions inferred from a hybrid ice sheet/ice stream model, Earth Planet. Sci. Lett., 295, 451–461, https://doi.org/10.1016/j.epsl.2010.04.025, 2010.
Piccione, G.: U-series Geochronology, Isotope, and Elemental Geochemistry of a Subglacial Precipitate that Formed Across Termination III, U.S. Antarctic Program (USAP) Data Center [data set], https://doi.org/10.15784/601781, 2024a.
Piccione, G.: Modeled Antarctic subglacial iron discharge across glacial termination III, Zenodo [code], https://doi.org/10.5281/zenodo.11126883, 2024b.
Piccione, G. and Tulaczyk, S.: Simplified model of thermal energy balance beneath the Antarctic ice sheet, Zenodo [code], https://doi.org/10.5281/zenodo.11126839, 2024.
Piccione, G., Blackburn, T., Tulaczyk, S., Rasbury, E. T., Hain, M. P., Ibarra, D. E., Methner, K., Tinglof, C., Cheney, B., Northrup, P., and Licht, K.: Subglacial precipitates record Antarctic ice sheet response to late Pleistocene millennial climate cycles, Nat. Commun., 13, 5428, https://doi.org/10.1038/s41467-022-33009-1, 2022.
Priscu, J. C., Kalin, J., Winans, J., Campbell, T., Siegfried, M. R., Skidmore, M., Dore, J. E., Leventer, A., Harwood, D. M., Duling, D., Zook, R., Burnett, J., Gibson, D., Krula, E., Mironov, A., McManis, J., Roberts, G., Rosenheim, B. E., Christner, B. C., Kasic, K., Fricker, H. A., Lyons, W. B., Barker, J., Bowling, M., Collins, B., Davis, C., Gagnon, A., Gardner, C., Gustafson, C., Kim, O. S., Li, W., Michaud, A., Patterson, M. O., Tranter, M., Venturelli, R., Vick-Majors, T., and Elsworth, C.: Scientific access into Mercer Subglacial Lake: Scientific objectives, drilling operations and initial observations, Ann. Glaciol., 62, 340–352, https://doi.org/10.1017/aog.2021.10, 2021.
Raiswell, R., Benning, L. G., Tranter, M., and Tulaczyk, S.: Bioavailable iron in the Southern Ocean: The significance of the iceberg conveyor belt, Geochem. Trans., 9, 7, https://doi.org/10.1186/1467-4866-9-7, 2008.
Raiswell, R., Hawkings, J. R., Benning, L. G., Baker, A. R., Death, R., Albani, S., Mahowald, N., Krom, M. D., Poulton, S. W., Wadham, J., and Tranter, M.: Potentially bioavailable iron delivery by iceberg-hosted sediments and atmospheric dust to the polar oceans, Biogeosciences, 13, 3887–3900, https://doi.org/10.5194/bg-13-3887-2016, 2016.
Ravel, B. and Newville, M.: ATHENA, ARTEMIS, HEPHAESTUS: data analysis for X-ray absorption spectroscopy using IFEFFIT, J. Synchrotron Radiat., 12, 537–541, https://doi.org/10.1107/S0909049505012719, 2005.
Sabine, C. L., Feely, R. A., Gruber, N., Key, R. M., Lee, K., Bullister, J. L., Wanninkhof, R., Wong, C. S., Wallace, D. W. R., Tilbrook, B., Millero, F. J., Peng, T.-H., Kozyr, A., Ono, T., and Rios, A. F.: The Oceanic Sink for Anthropogenic CO2, Science, 305, 367–371, https://doi.org/10.1126/science.1097403, 2004.
Schaub, D. R., Northrup, P., Nekvasil, H., Catalano, T., and Tappero, R.: Gas-mediated trace element incorporation into rhyolite-hosted topaz: A synchrotron microbeam XAS study, Am. Mineral., 108, 2153–2163, https://doi.org/10.2138/am-2022-8417, 2023.
Schosseler, P. M., Wehrli, B., and Schweiger, A.: Uptake of Cu2+ by the calcium carbonates vaterite and calcite as studied by continuous wave (cw) and pulse electron paramagnetic resonance, Geochim. Cosmochim. Ac., 63, 1955–1967, https://doi.org/10.1016/S0016-7037(99)00086-1, 1999.
Scott, C. and Lyons, T. W.: Contrasting molybdenum cycling and isotopic properties in euxinic versus non-euxinic sediments and sedimentary rocks: Refining the paleoproxies, Chem. Geol., 324–325, 19–27, https://doi.org/10.1016/j.chemgeo.2012.05.012, 2012.
Shoenfelt, E. M., Winckler, G., Lamy, F., Anderson, R. F., and Bostick, B. C.: Highly bioavailable dust-borne iron delivered to the Southern Ocean during glacial periods, P. Natl. Acad. Sci. USA, 115, 11180–11185, https://doi.org/10.1073/pnas.1809755115, 2018.
Siegfried, M. R. and Fricker, H. A.: Thirteen years of subglacial lake activity in Antarctica from multi-mission satellite altimetry, Ann. Glaciol., 59, 42–55, https://doi.org/10.1017/aog.2017.36, 2018.
Sigman, D. M., Hain, M. P., and Haug, G. H.: The polar ocean and glacial cycles in atmospheric CO2 concentration, Nature, 466, 47–55, https://doi.org/10.1038/nature09149, 2010.
Sigman, D. M., Fripiat, F., Studer, A. S., Kemeny, P. C., Martínez-García, A., Hain, M. P., Ai, X., Wang, X., Ren, H., and Haug, G. H.: The Southern Ocean during the ice ages: A review of the Antarctic surface isolation hypothesis, with comparison to the North Pacific, Quat. Sci. Rev., 254, 106732, https://doi.org/10.1016/j.quascirev.2020.106732, 2021.
Skidmore, M., Tranter, M., Tulaczyk, S., and Lanoil, B.: Hydrochemistry of ice steams beds- evaporitic or microbial effects?, Hydrol. Process., 24, 517–523, https://doi.org/10.1002/hyp.7580, 2010.
Sklute, E. C., Mikucki, J. A., Dyar, M. D., Lee, P. A., Livi, K. J. T., and Mitchell, S.: A Multi-Technique Analysis of Surface Materials From Blood Falls, Antarctica, Front. Astron. Space Sci., 9, 1–23, https://doi.org/10.3389/fspas.2022.843174, 2022.
Staudt, W. J. and Schoonen, M. A. A.: Sulfate Incorporation into Sedimentary Carbonates, in: Geochemical Transformations of Sedimentary Sulfur, vol. 612, American Chemical Society, Washington, DC, https://doi.org/10.1021/bk-1995-0612, 1995.
Studer, A. S., Sigman, D. M., Martínez-García, A., Benz, V., Winckler, G., Kuhn, G., Esper, O., Lamy, F., Jaccard, S. L., Wacker, L., Oleynik, S., Gersonde, R., and Haug, G. H.: Antarctic Zone nutrient conditions during the last two glacial cycles, Paleoceanography, 30, 845–862, https://doi.org/10.1002/2014PA002745, 2015.
Tribovillard, N., Algeo, T. J., Lyons, T., and Riboulleau, A.: Trace metals as paleoredox and paleoproductivity proxies: An update, Chem. Geol., 232, 12–32, https://doi.org/10.1016/j.chemgeo.2006.02.012, 2006.
Tulaczyk, S., Mikucki, J. A., Siegfried, M. R., Priscu, J. C., Barcheck, C. G., Beem, L. H., Behar, A., Burnett, J., Christner, B. C., Fisher, A. T., Fricker, H. A., Mankoff, K. D., Powell, R. D., Rack, F., Sampson, D., Scherer, R. P., and Schwartz, S. Y.: WISSARD at Subglacial Lake Whillans, West Antarctica: Scientific operations and initial observations, Ann. Glaciol., 55, 51–58, https://doi.org/10.3189/2014AoG65A009, 2014.
Veres, D., Bazin, L., Landais, A., Toyé Mahamadou Kele, H., Lemieux-Dudon, B., Parrenin, F., Martinerie, P., Blayo, E., Blunier, T., Capron, E., Chappellaz, J., Rasmussen, S. O., Severi, M., Svensson, A., Vinther, B., and Wolff, E. W.: The Antarctic ice core chronology (AICC2012): an optimized multi-parameter and multi-site dating approach for the last 120 thousand years, Clim. Past, 9, 1733–1748, https://doi.org/10.5194/cp-9-1733-2013, 2013.
Vick-Majors, T. J., Mitchell, A. C., Achberger, A. M., Christner, B. C., Dore, J. E., Michaud, A. B., Mikucki, J. A., Purcell, A. M., Skidmore, M. L., Priscu, J. C., Adkins, W. P., Anandakrishnan, S., Barbante, C., Barcheck, G., Beem, L., Behar, A., Beitch, M., Bolsey, R., Branecky, C., Edwards, R., Fisher, A., Fricker, H. A., Foley, N., Guthrie, B., Hodson, T., Horgan, H., Jacobel, R., Kelley, S., Mankoff, K. D., McBryan, E., Powell, R., Sampson, D., Scherer, R., Siegfried, M., and Tulaczyk, S.: Physiological ecology of microorganisms in subglacial lake whillans, Front. Microbiol., 7, 1–16, https://doi.org/10.3389/fmicb.2016.01705, 2016.
Vick-Majors, T. J., Michaud, A. B., Skidmore, M. L., Turetta, C., Barbante, C., Christner, B. C., Dore, J. E., Christianson, K., Mitchell, A. C., Achberger, A. M., Mikucki, J. A., and Priscu, J. C.: Biogeochemical Connectivity Between Freshwater Ecosystems beneath the West Antarctic Ice Sheet and the Sub-Ice Marine Environment, Glob. Biogeochem. Cycles, 34, e2019GB006446, https://doi.org/10.1029/2019GB006446, 2020.
Wadham, J. L., Tranter, M., Skidmore, M., Hodson, A. J., Priscu, J., Lyons, W. B., Sharp, M., Wynn, P., and Jackson, M.: Biogeochemical weathering under ice: Size matters, Glob. Biogeochem. Cycles, 24, GB3025, https://doi.org/10.1029/2009GB003688, 2010.
Webster, J. G.: Trace-metal behaviour in oxic and anoxic CaCl brines of the Wright Valley drainage, Antarctica, Chem. Geol., 112, 255–274, https://doi.org/10.1016/0009-2541(94)90028-0, 1994.
Wilson, D. J., Bertram, R. A., Needham, E. F., van de Flierdt, T., Welsh, K. J., McKay, R. M., Mazumder, A., Riesselman, C. R., Jimenez-Espejo, F. J., and Escutia, C.: Ice loss from the East Antarctic Ice Sheet during late Pleistocene interglacials, Nature, 561, 383–386, https://doi.org/10.1038/s41586-018-0501-8, 2018.
Wittkop, C., Swanner, E. D., Grengs, A., Lambrecht, N., Fakhraee, M., Myrbo, A., Bray, A. W., Poulton, S. W., and Katsev, S.: Evaluating a primary carbonate pathway for manganese enrichments in reducing environments, Earth Planet. Sci. Lett., 538, 116201, https://doi.org/10.1016/j.epsl.2020.116201, 2020.
Wróblewski, W., Gradziński, M., Motyka, J., and Stankovič, J.: Recently growing subaqueous flowstones: Occurrence, petrography, and growth conditions, Quat. Int., 437, 84–97, https://doi.org/10.1016/j.quaint.2016.10.006, 2017.
Short summary
Growth of microorganisms in the Southern Ocean is limited by low iron levels. Iron delivered from beneath the Antarctic Ice Sheet is one agent that fertilizes these ecosystems, but it is unclear how this nutrient source changes through time. Here, we measured the age and chemistry of a rock that records the iron concentration of Antarctic basal water. We show that increased dissolution of iron from rocks below the ice sheet can substantially enhance iron discharge during cold climate periods.
Growth of microorganisms in the Southern Ocean is limited by low iron levels. Iron delivered...
