Articles | Volume 43, issue 2
https://doi.org/10.5194/jm-43-269-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/jm-43-269-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
01 Aug 2024
Research article |
| 01 Aug 2024
| 01 Aug 2024
Direct link between iceberg melt and diatom productivity demonstrated in Mid-Pliocene Amundsen Sea interglacial sediments
Heather Furlong
CORRESPONDING AUTHOR
Department of Earth, Atmosphere and Environment, Northern Illinois University, DeKalb, IL, 60115, USA
Reed Paul Scherer
Department of Earth, Atmosphere and Environment, Northern Illinois University, DeKalb, IL, 60115, USA
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Cited articles
Abelmann, A., Gersonde, R., and Spiess, V.: Pliocene–Pleistocene paleoceanography in the Weddell Sea – siliceous microfossil evidence, Geological history of the polar oceans: Arctic versus Antarctic, in: Geological History of the Polar Oceans: Arctic Versus Antarctic, edited by: Bleil, U. and Thiede, J., Kluwer, Dordrecht, the Netherlands, 729–759, https://hdl.handle.net/10013/epic.10607 (last access: 29 July 2024), 1990.
Armbrecht, L. H., Lowe, V., Escutia, C., Iwai, M., McKay, R., and Armand, L. K.: Variability in diatom and silicoflagellate assemblages during mid-Pliocene glacial-interglacial cycles determined in Hole U1361A of IODP Expedition 318, Antarctic Wilkes Land Margin, Mar. Micropaleontol., 139, 28–41, https://doi.org/10.1016/j.marmicro.2017.10.008, 2018.
Bett, D. T., Bradley, A. T., Williams, C. R., Holland, P. R., Arthern, R. J., and Goldberg, D. N.: Coupled ice–ocean interactions during future retreat of West Antarctic ice streams in the Amundsen Sea sector, The Cryosphere, 18, 2653–2675, https://doi.org/10.5194/tc-18-2653-2024, 2024.
Bonn, W. J., Gingele, F. X., Grobe, H., Mackensen, A., and Fütterer, D. K.: Palaeoproductivity at the Antarctic continental margin: opal and barium records for the last 400 ka, Palaeogeogr. Palaeoecol., 139, 195–211, https://doi.org/10.1016/S0031-0182(97)00144-2, 1998.
Carter, S. C., Paytan, A., and Griffith, E. M.: Toward an improved understanding of the marine barium cycle and the application of marine barite as a paleoproductivity proxy, Minerals, 10, 421, https://doi.org/10.3390/min10050421, 2020.
Cefarelli, A. O., Ferrario, M. E., Almandoz, G. O., Atencio, A. G., Akselman, R., and Vernet, M.: Diversity of the diatom genus Fragilariopsis in the Argentine Sea and Antarctic waters: morphology, distribution and abundance, Polar Biol., 33, 1463–1484, https://doi.org/10.1007/s00300-010-0794-z, 2010.
Cenedese, C. and Straneo, F.: Icebergs melting, Annu. Rev. Fluid Mech., 55, 377–402, https://doi.org/10.1146/annurev-fluid-032522-100734, 2023.
Censarek, B. and Gersonde, R.: Miocene diatom biostratigraphy at ODP Sites 689, 690, 1088, 1092 (Atlantic sector of the Southern Ocean), Mar. Micropaleontol., 45, 309–356, https://doi.org/10.1016/S0377-8398(02)00034-8, 2002.
Cortese, G. and Gersonde, R.: Plio/Pleistocene changes in the main biogenic silica carrier in the Southern Ocean, Atlantic Sector, Mar. Geol., 252, 3–4, https://doi.org/10.1016/j.margeo.2008.03.015, 2008.
Cortese, G., Gersonde, R., Hillenbrand, C. D., and Kuhn, G.: Opal sedimentation shifts in the World Ocean over the last 15 Myr, Earth Planet. Sc. Lett., 224, 509–527, https://doi.org/10.1016/j.epsl.2004.05.035, 2004.
Crosta, X., Pichon, J. J., and Labracherie, M.: Distribution of Chaetoceros resting spores in modern peri-Antarctic sediments, Mar. Micropaleontol., 29, 283–299, https://doi.org/10.1016/S0377-8398(96)00033-3, 1997.
Crosta, X., Romero, O., Armand, L. K., and Pichon, J. J.: The biogeography of major diatom taxa in Southern Ocean sediments: 2. Open Ocean related species, Palaeogeogr. Palaeoecol., 223, 66–92, https://doi.org/10.1016/j.palaeo.2005.03.028, 2005.
Crosta, X., Denis, D., and Ther, O.: Sea ice seasonality during the Holocene, Adélie Land, East Antarctica, Mar. Micropaleontol., 66, 222–232, https://doi.org/10.1016/j.marmicro.2007.10.001, 2008.
DeConto, R. M. and Pollard, D.: Contribution of Antarctica to past and future sea-level rise, Nature, 531, 591–597, https://doi.org/10.1038/nature17145, 2016.
Dixit, S., Smol, J. P., Kingston, J. C., and Charles, D. F.: Diatoms-Powerful Indicators of Environmental-Change, Environ. Sci. Technol., 26, 22–33, https://doi.org/10.1021/es00025a002, 1992.
Dowsett, H., Barron, J., and Poore, R.: Middle Pliocene sea surface temperatures: a global reconstruction, Mar. Micropaleontol., 27, 13–25, https://doi.org/10.1016/0377-8398(95)00050-X, 1996.
Duprat, L. P., Bigg, G. R., and Wilton, D. J.: Enhanced Southern Ocean marine productivity due to fertilization by giant icebergs, Nat. Geosci., 9, 219–221, https://doi.org/10.1038/ngeo2633, 2016.
Gerringa, L. J. A., Alderkamp, A.-C., Laan, P., Thuróczy, C.-E., De Baar, H. J. W., Mills, M. M., Van Dijken, G. L., Van Haren, H., 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.
Greene, C. A., Gardner, A. S., Schlegel, N. J., and Fraser, A. D.: Antarctic calving loss rivals ice-shelf thinning, Nature, 609, 948–953, https://doi.org/10.1038/s41586-022-05037-w, 2022.
Grigorov, I., Pearce, R. B., and Kemp, A. E.: Southern Ocean laminated diatom ooze: mat deposits and potential for palaeo-flux studies, ODP leg 177, Site 1093, Deep-Sea Res. Pt. II, 49, 3391–3407, https://doi.org/10.1016/S0967-0645(02)00089-9, 2002.
Gohl, K., Wellner, J. S., Klaus, A., and the Expedition 379 Scientists: Expedition 379 Preliminary Report: Amundsen Sea West Antarctica Ice Sheet History, International Ocean Discovery Program, https://doi.org/10.14379/iodp.pr.379.2019, 2019.
Gohl, K., Wellner, J. S., Klaus, A., and the Expedition 379 Scientists: Amundsen Sea West Antarctic Ice Sheet History, Proceedings of the IODP 379, https://doi.org/10.14379/iodp.proc.379.2021, 2021.
Hillenbrand, C. D., Kuhn, G., and Frederichs, T.: Record of a Mid-Pleistocene depositional anomaly in West Antarctic continental margin sediments: an indicator for ice-sheet collapse?, Quaternary Sci. Rev., 28, 1147–1159, https://doi.org/10.1016/j.quascirev.2008.12.010, 2009.
Hopwood, M. J., Carroll, D., Höfer, J., Achterberg, E. P., Meire, L., Le Moigne, F. A., Bach, L. T., Eich, C., Sutherland, D. A., and González, H. E.: Highly variable iron content modulates iceberg-ocean fertilisation and potential carbon export, Nat. Commun., 10, 5261, https://doi.org/10.1038/s41467-019-13231-0, 2019.
Horrocks, J.: The formation and Late Quaternary palaeoenvironmental history of sediment mounds in the Amundsen Sea, West Antarctica, Doctoral dissertation, Durham University, https://nora.nerc.ac.uk/id/eprint/520455 (last access: 29 July 2024), 2018.
Johnson, T. C.: The dissolution of siliceous microfossils in surface sediments of the eastern tropical Pacific, Deep-Sea Res., 21, 851–864, https://doi.org/10.1016/0011-7471(74)90004-7, 1974.
Kemp, A. E., Pike, J., Pearce, R. B., and Lange, C. B.: The “Fall dump” – a new perspective on the role of a “shade flora” in the annual cycle of diatom production and export flux, Deep-Sea Res. Pt. II, 47, 2129–2154, https://doi.org/10.1016/S0967-0645(00)00019-9, 2000.
Kemp, A. E., Pearce, R. B., Grigorov, I., Rance, J., Lange, C. B., Quilty, P., and Salter, I.: Production of giant marine diatoms and their export at oceanic frontal zones: Implications for Si and C flux from stratified oceans, Global Biogeochem. Cy., 20, GB4S04, https://doi.org/10.1029/2006GB002698, 2006.
Kemp, A. E. S., Baldauf, J. G., and Pearce, R. B.: Origins and palaeoceanographic significance of laminated diatom ooze from the Eastern Equatorial Pacific Ocean, Geol. Soc. Lond. Spec. Publ., 116, 243–252, https://doi.org/10.1144/GSL.SP.1996.116.01.19, 1996.
Kemp, A. E. S., Grigorov, I., Pearce, R. B., and Garabato, A. N.: Migration of the Antarctic Polar Front through the mid-Pleistocene transition: evidence and climatic implications, Quaternary Sci. Rev., 29, 1993–2009, https://doi.org/10.1016/j.quascirev.2010.04.027, 2010.
Konfirst, M. A., Scherer, R. P., Hillenbrand, C. D., and Kuhn, G.: A marine diatom record from the Amundsen Sea – Insights into oceanographic and climatic response to the Mid-Pleistocene Transition in the West Antarctic sector of the Southern Ocean, Mar. Micropaleontol., 92, 40–51, https://doi.org/10.1016/j.marmicro.2012.05.001, 2012.
Kopczyńska, E., Fiala, M., and Jeandel, C.: Annual and interannual variability in phytoplankton at a permanent station off Kerguelen Islands, Southern Ocean, Polar Biol., 20, 342–351, https://doi.org/10.1007/s003000050312, 1998.
Lan, X., Hall, B. D., Dutton, G., Mühle, J., and Elkins, J. W.: Atmospheric composition, State of the Climate in 2018, Chapter 2: Global Climate, Special Online Supplement to the Bulletin of the American Met. Soc., Vol. 101, No. 8, https://doi.org/10.1175/2021BAMSStateoftheClimate.1, 2020.
Lin, H., Rauschenberg, S., Hexel, C. R., Shaw, T. J., and Twining, B. S.: Free-drifting icebergs as sources of iron to the Weddell Sea, Deep-Sea Res. Pt. II, 58, 1392–1406, https://doi.org/10.1016/j.dsr2.2010.11.020, 2011.
Laufkötter, C., Stern, A. A., John, J. G., Stock, C. A., and Dunne, J. P.: Glacial iron sources stimulate the southern ocean carbon cycle, Geophys. Res. Lett., 45, 13–377, https://doi.org/10.1029/2018GL079797, 2018.
Leventer, A.: Sediment trap diatom assemblages from the northern Antarctic Peninsula region, Deep-Sea Res. Pt. A, 38, 1127–1143, https://doi.org/10.1016/0198-0149(91)90099-2, 1991.
Leventer, A., Domack, E., Barkoukis, A., McAndrews, B., and Murray, J.: Laminations from the Palmer Deep: A diatom-based interpretation, Palaeoceanography, 17, PAL 3-1–PAL 3-15, https://doi.org/10.1029/2001PA000624, 2002.
Liguori, B. T., Almeida, M. G., and Rezende, C. E.: Barium and its Importance as an Indicator of (Paleo) Productivity, An. Acad. Bras. Ciênc., 88, 2093–2103, https://doi.org/10.1590/0001-3765201620140592, 2016.
McKay, R., Naish, T., Powell, R., Barrett, P., Scherer, R., Talarico, F., Kyle, P., Monien, D., Kuhn, G., Jackolski, C., and Williams, T.: Pleistocene variability of Antarctic Ice Sheet extent in the Ross Embayment, Quaternary Sci. Rev., 34, 93–112, https://doi.org/10.1016/j.quascirev.2011.12.012, 2012.
McMinn, A.: Comparison of Diatom Preservation Between Oxic and Anoxic Basins in Ellis Fjord Antarctica, Diatom Res., 10, 145–151, https://doi.org/10.1080/0269249X.1995.9705333, 1995.
Mercer, J. H.: West Antarctica Ice Sheet and CO2 Greenhouse Effect: A Threat of Disaster, Nature, 271, 321–325, https://doi.org/10.1038/271321a0, 1978.
Morlighem, M., Rignot, E., Binder, T., Blankenship, D., Drews, R., Eagles, G., Eisen, O., Ferraccioli, F., and Forsberg, R., Fretwell, P., and Goel, V.: Deep glacial troughs and stabilizing ridges unveiled beneath the margins of the Antarctic ice sheet, Nat. Geosci., 13, 132–137, https://doi.org/10.1038/s41561-019-0510-8, 2020.
Mortlock, R. A. and Froelich, P. N.: A simple method for the rapid determination of biogenic opal in pelagic marine sediments, Deep-Sea Res. Pt. A., 36, 1415–1426, https://doi.org/10.1016/0198-0149(89)90092-7, 1989.
Naish, T., Powell, R., Levy, R., Wilson, G., Scherer, R., Talarico, F., Krissek, L., Niessen, F., Pompilio, M., Wilson, T., and Carter, L.: Obliquity-paced Pliocene West Antarctic ice sheet oscillations, Nature, 458, 322–328, https://doi.org/10.1038/nature07867, 2009.
Paytan, A. and Griffith, E. M.: Marine barite: Recorder of variations in ocean export Productivity, Deep-Sea Res. Pt. II, 54, 687–705, https://doi.org/10.1016/j.dsr2.2007.01.007, 2007.
Planquette, H., Sherrell, R. M., Stammerjohn, S., and Field, M. P.: Particulate iron delivery to the water column of the Amundsen Sea, Antarctica, Mar. Chem., 153, 15–30, https://doi.org/10.1016/j.marchem.2013.04.006, 2013.
Pollard, D. and DeConto, R.: Modelling West Antarctic ice sheet growth and collapse through the past five million years, Nature, 458, 329–332, https://doi.org/10.1038/nature07809, 2009.
Pollock, D. E.: The role of diatoms, dissolved silicate and Antarctic glaciation in glacial/interglacial climatic change: a hypothesis, Global Planet. Change, 14, 113–125, https://doi.org/10.1016/S0921-8181(96)00005-7, 1997.
Quilty, P. G., Kerry, K. R., and Marchant, H. J.: A seasonally recurrent patch of Antarctic planktonic diatoms, Search, 16, 48–51, 1985.
Raiswell, R., Benning, L. G., Tranter, M., and Tulaczyk, S.: Bioavailable iron in the Southern Ocean: the significance of the iceberg conveyor belt, Geochem. T., 9, 1–9, 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.
Rignot, E., Mouginot, J., Scheuchl, B., Van Den Broeke, M., Van Wessem, M. J., and Morlighem, M.: Four decades of Antarctic Ice Sheet mass balance from 1979–2017, P. Natl. Acad. Sci., 116, 1095–1103, https://doi.org/10.1073/pnas.1812883116, 2019.
Robinson, D. E., Menzies, J., Wellner, J. S., and Clark, R. W.: Subglacial sediment deformation in the Ross Sea, Antarctica, Quaternary Sci. Adv., 4, 100029, https://doi.org/10.1016/j.qsa.2021.100029, 2021.
Ruggiero, J. A., Scherer, R. P., Mastro, J., Lopez, C., Angus, M., Unger-Harquail, E., Quartz, O., Leventer, A., and Hillenbrand, C.-D.: Last Interglacial Southern Ocean paleothermometry from diatom morphometrics: Analysis and application of the F. kerguelensis valve rectangularity sea surface temperature proxy, J. Micropalaeontol., in press, 2024.
Scherer, R. P.: Pliocene diatom abundance, IODP 397-U1532, USAP-DC [data set], https://www.usap-dc.org/view/dataset/601769, last access: 20 February 2024.
Scherer, R. P., Aldahan, A., Tulaczyk, S., Possnert, G., Engelhardt, H., and Kamb, B.: Pleistocene Collapse of the West Antarctic Ice Sheet, Science, 281, 82–85, https://doi.org/10.1126/science.281.5373.82, 1998.
Smith Jr., K. L., Robison, B. H., Helly, J. J., Kaufmann, R. S., Ruhl, H. A., Shaw, T. J., Twining, B. S., and Vernet, M.: Free-drifting icebergs: hot spots of chemical and biological enrichment in the Weddell Sea, Science, 317, 478–482, https://doi.org/10.1126/science.1142834, 2007.
Stephenson Jr., G. R., Sprintall, J., Gille, S. T., Vernet, M., Helly, J. J., and Kaufmann, R. S.: Subsurface melting of a free-floating Antarctic iceberg, Deep-Sea Res. Pt. II, 58, 1336–1345, https://doi.org/10.1016/j.dsr2.2010.11.009, 2011.
St-Laurent, P., Yager, P. L., Sherrell, R. M., Stammerjohn, S. E., and Dinniman, M. S.: Pathways and supply of dissolved iron in the Amundsen Sea (Antarctica), J. Geophys. Res.-Oceans, 122, 7135–7162, https://doi.org/10.1002/2017JC013162, 2017.
St-Laurent, P., Yager, P. L., Sherrell, R. M., Oliver, H., Dinniman, M. S., and Stammerjohn, S. E.: Modeling the seasonal cycle of iron and carbon fluxes in the Amundsen Sea Polynya, Antarctica, J. Geophys. Res.-Oceans, 124, 1544–1565, https://doi.org/10.1029/2018JC014773, 2019.
Thuróczy, C.-E., Alderkamp, A.-C., Laan, P., Gerringa, L. J. A., Mills, M. M., Van Dijken, G. L., De Baar, H. J. W., and Arrigo, K. R.: Key role of organic complexation of iron in sustaining phytoplankton blooms in the Pine Island and Amundsen Polynyas (Southern Ocean), Deep-Sea Res. Pt. II, 71–76, 49–60, https://doi.org/10.1016/j.dsr2.2012.03.009, 2012.
Warnock, J. P. and Scherer, R. P.: A revised method for determining the absolute abundance of diatoms, Paleolimnol., 53, 157–163, https://doi.org/10.1007/s10933-014-9808-0, 2015a.
Warnock, J. P. and Scherer, R. P.: Diatom species abundance and morphologically-based dissolution proxies in coastal Southern Ocean assemblages, Cont. Shelf Res., 102, 1–8, https://doi.org/10.1016/j.csr.2015.04.012, 2015b.
Wu, S.-Y. and Hou, S.: Impact of icebergs on net primary productivity in the Southern Ocean, The Cryosphere, 11, 707–722, https://doi.org/10.5194/tc-11-707-2017, 2017.
Zielinski, U. and Gersonde, R.: Diatom distribution in Southern Ocean surface sediments (Atlantic sector): Implications for paleoenvironmental reconstructions, Palaeogeogr. Palaeoecol., 129, 213–250, https://doi.org/10.1016/S0031-0182(96)00130-7, 1997.
Zielinski, U., Bianchi, C., Gersonde, R., and Kunz-Pirrung, M.: Last occurrence datums of the diatoms Rouxia leventerae and Rouxia constricta: indicators for marine isotope stages 6 and 8 in Southern Ocean sediments, Mar. Micropaleontol., 46, 127–137, https://doi.org/10.1016/S0377-8398(02)00042-7, 2002.
Short summary
Diatom assemblages are vital components of the Antarctic ecosystem and nutrient supply chain, and they are often utilized as paleoclimate proxies to better understand past climatic changes. We demonstrate enhanced diatom production and accumulation in the outer Amundsen Sea during a Mid-Pliocene interglacial that coincides with pulses of ice-rafted terrestrial debris, providing compelling evidence that iceberg calving seeds diatom productivity in the Southern Ocean.
Diatom assemblages are vital components of the Antarctic ecosystem and nutrient supply chain,...
