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The origin of lithogenic sediment in the south-western Ross Sea and implications for iron fertilization

  • V.H.L. Winton (a1), G.B. Dunbar (a2), C.B. Atkins (a3), N.A.N. Bertler (a2) (a4), B. Delmonte (a5), P.S. Andersson (a6), A. Bowie (a7) (a8) and R. Edwards (a1)...

Summer iron (Fe) fertilization in the Ross Sea has previously been observed in association with diatom productivity, lithogenic particles and excess Fe in the water column. This productivity event occurred during an early breakout of sea ice via katabatic winds, suggesting that aeolian dust could be an important source of lithogenic Fe required for diatom growth in the Ross Sea. Here we investigate the provenance of size-selected dust deposited on sea ice in McMurdo Sound, south-western (SW) Ross Sea. The isotopic signature of McMurdo Sound dust (0.70533<87Sr/86Sr<0.70915 and -1.1<εNd(0)<3.45) confirms that dust is locally sourced from the McMurdo Sound debris bands and comprises a two-component mixture of McMurdo Volcanic Group and southern Victoria Land lithologies. In addition, the provenance of lithogenic sediment trapped in the water column was investigated, and the isotopic signature (εNd(0)=3.9, 87Sr/86Sr=0.70434) is differentiated from long-range transported dust originating from South America and Australia. Elevated lithogenic accumulation rates in deeper sediment traps in the Ross Sea suggest that sinking particles in the water column cannot simply result from dust input at the surface. This discrepancy can be best explained by significant upwelling and remobilization of lithogenic Fe from the sea floor.

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Albani, S., Delmonte, B., Maggi, V., Baroni, C., Petit, J.R., Stenni, B., Mazzola, C. & Frezzotti, M. 2012. Interpreting last glacial to Holocene dust changes at Talos Dome (East Antarctica): implications for atmospheric variations from regional to hemispheric scales. Climate of the Past, 8, 741750.
Andersson, P.S., Wasserburg, G.J., Ingri, J. & Stordal, M.C. 1994. Strontium, dissolved and particulate loads in fresh and brackish waters: the Baltic Sea and Mississippi Delta. Earth and Planetary Science Letters, 124, 195210.
Andreasen, R. & Sharma, M. 2006. Solar nebula heterogeneity in p-process samarium and neodymium isotopes. Science, 314, 806809.
Arrigo, K.R., DiTullio, G.R., Dunbar, R.B., Robinson, D.H., VanWoert, M., Worthen, D.L. & Lizotte, M.P. 2000. Phytoplankton taxonomic variability in nutrient utilization and primary production in the Ross Sea. Journal of Geophysical Research - Oceans, 105, 88278846.
Arrigo, K.R., van Dijken, G. & Long, M. 2008. Coastal Southern Ocean: a strong anthropogenic CO2 sink. Geophysical Research Letters, 35, 10.1029/2008GL035624.
Atkins, C.B. & Dunbar, G.B. 2009. Aeolian sediment flux from sea ice into southern McMurdo Sound, Antarctica. Global and Planetary Change, 69, 133141.
Banse, K. 1991. Rates of phytoplankton cell division in the field and in iron enrichment experiments. Limnology and Oceanography, 36, 18861898.
Barrett, P., Pyne, A. & Ward, B. 1983. Modern sedimentation in McMurdo Sound, Antarctica. In Oliver, R.L., James, P.R. & Jago, J.B., eds. Antarctic earth science. New York, NY: Cambridge University Press, 550554.
Basak, C., Pahnke, K., Frank, M., Lamy, F. & Gersonde, R. 2015. Neodymium isotopic characterization of Ross Sea Bottom Water and its advection through the southern South Pacific. Earth and Planetary Science Letters, 419, 211221.
Boyd, P.W., Mackie, D.S. & Hunter, K.A. 2010. Aerosol iron deposition to the surface ocean – modes of iron supply and biological responses. Marine Chemistry, 120, 128143.
Bunt, J.S. & Wood, E.J.F. 1963. Microbiology of Antarctic sea-ice: microalgae and Antarctic sea-ice. Nature, 199, 12541255.
Chewings, J.M., Atkins, C.B., Dunbar, G.B. & Golledge, N.R. 2014. Aeolian sediment transport and deposition in a modern high latitude glacial marine environment. Sedimentology, 61, 15351557.
Collier, R., Dymond, J., Honjo, S., Manganini, S., Francois, R. & Dunbar, R. 2000. The vertical flux of biogenic and lithogenic material in the Ross Sea: moored sediment trap observations 1996–1998. Deep Sea Research II - Topical Studies in Oceanography, 47, 34913520.
De Jong, J., Schoemann, V., Maricq, N., Mattielli, N., Langhorne, P., Haskell, T. & Tison, J.-L. 2013. Iron in land-fast sea ice of McMurdo Sound derived from sediment resuspension and wind-blown dust attributes to primary productivity in the Ross Sea, Antarctica. Marine Chemistry, 157, 2440.
Delmonte, B., Petit, J.R. & Maggi, V. 2002. Glacial to Holocene implications of the new 27000-year dust record from the EPICA Dome C (East Antarctica) ice core. Climate Dynamics, 18, 647660.
Delmonte, B., Robert Petit, J., Basile-Doelsch, I., Jagoutz, E. & Maggi, V. 2007. 6. Late quaternary interglacials in East Antarctica from ice-core dust records. Developments in Quaternary Sciences, 7, 5373.
Delmonte, B., Andersson, P.S., Hansson, M., Schöberg, H., Petit, J.R., Basile-Doelsch, I. & Maggi, V. 2008. Aeolian dust in East Antarctica (EPICA-Dome C and Vostok): provenance during glacial ages over the last 800 kyr. Geophysical Research Letters, 35, 10.1029/2008GL033382.
Delmonte, B., Basile-Doelsch, I., Petit, J.R., Maggi, V., Revel-Rolland, M., Michard, A., Jagoutz, E. & Grousset, F. 2004. Comparing the Epica and Vostok dust records during the last 220,000 years: stratigraphical correlation and provenance in glacial periods. Earth-Science Reviews, 66, 6387.
Delmonte, B., Baroni, C., Andersson, P., Narcisi, B., Salvatore, M.C., Petit, J.R., Scarchilli, C., Frezzotti, M., Albani, S. & Maggi, V. 2013. Modern and Holocene aeolian dust variability from Talos Dome (northern Victoria Land) to the interior of the Antarctic ice sheet. Quaternary Science Reviews, 64, 7689.
Delmonte, B., Baroni, C., Andersson, P.S., Schoberg, H., Hansson, M., Aciego, S., Petit, J.R., Albani, S., Mazzola, C., Maggi, V. & Frezzotti, M. 2010. Aeolian dust in the Talos Dome ice core (East Antarctica, Pacific/Ross Sea sector): Victoria Land versus remote sources over the last two climate cycles. Journal of Quaternary Science, 25, 13271337.
Dunbar, G.B., Bertler, N.A.N. & McKay, R.M. 2009. Sediment flux through the McMurdo Ice Shelf in Windless Bight, Antarctica. Global and Planetary Change, 69, 8793.
Edwards, R. & Sedwick, P. 2001. Iron in East Antarctic snow: implications for atmospheric iron deposition and algal production in Antarctic waters. Geophysical Research Letters, 28, 39073910.
Elderfield, H. 1986. Strontium isotope stratigraphy. Palaeogeography, Palaeoclimatology, Palaeoecology, 57, 7190.
Freydier, R., Michard, A., De Lange, G. & Thomson, J. 2001. Nd isotopic compositions of Eastern Mediterranean sediments: tracers of the Nile influence during sapropel S1 formation? Marine Geology, 177, 4562.
Futa, K. & LeMasurier, W.E. 1983. Nd and Sr isotopic studies on Cenozoic mafic lavas from West Antarctica: another source for continental alkali basalts. Contributions to Mineralogy and Petrology, 83, 3844.
Gaiero, D.M., Brunet, F., Probst, J.-L. & Depetris, P.J. 2007. A uniform isotopic and chemical signature of dust exported from Patagonia: rock sources and occurrence in southern environments. Chemical Geology, 238, 107120.
Gerringa, L.J.A., Laan, P., van Dijken, G.L., van Haren, H., De Baar, H.J.W., Arrigo, K.R. & Alderkamp, A.C. 2015. Sources of iron in the Ross Sea polynya in early summer. Marine Chemistry, 177, 447459.
Hole, M.J. & LeMasurier, W.E. 1994. Tectonic controls on the geochemical composition of Cenozoic, mafic alkaline volcanic rocks from West Antarctica. Contributions to Mineralogy and Petrology, 117, 187202.
Kellogg, T.B., Kellogg, D. & Stuiver, M. 1990. Late Quaternary history of the southwestern Ross Sea: evidence from debris bands on the McMurdo Ice Shelf, Antarctica. Antarctic Research Series, 50, 2556.
Kustka, A.B., Kohut, J.T., White, A.E., Lam, P.J., Milligan, A.J., Dinniman, M.S., Mack, S., Hunter, E., Hiscock, M.R., Smith, W.O. & Measures, C.I. 2015. The roles of MCDW and deep water iron supply in sustaining a recurrent phytoplankton bloom on central Pennell Bank (Ross Sea). Deep-Sea Research I - Oceanographic Research Papers, 105, 171185.
Marsay, C.M., Sedwick, P.N., Dinniman, M.S., Barrett, P.M., Mack, S.L. & McGillicuddy, D.J. 2014. Estimating the benthic efflux of dissolved iron on the Ross Sea continental shelf. Geophysical Research Letters, 41, 75767583.
McGillicuddy, D.J., Sedwick, P.N., Dinniman, M.S., Arrigo, K.R., Bibby, T.S., Greenan, B.J.W., Hofmann, E.E., Klinck, J.M., Smith, W.O., Mack, S.L., Marsay, C.M., Sohst, B.M. & van Dijken, G.L. 2015. Iron supply and demand in an Antarctic shelf ecosystem. Geophysical Research Letters, 42, 80888097.
Mitchell, B.G., Brody, E.A., HolmHansen, O., McClain, C. & Bishop, J. 1991. Light limitation of phytoplankton biomass and macronutrient utilization in the Southern Ocean. Limnology and Oceanography, 36, 16621677.
Revel-Rolland, M., De Deckker, P., Delmonte, B., Hesse, P.P., Magee, J.W., Basile-Doelsch, I., Grousset, F. & Bosch, D. 2006. Eastern Australia: a possible source of dust in East Antarctica interglacial ice. Earth and Planetary Science Letters, 249, 113.
Sedwick, P.N. & DiTullio, G.R. 1997. Regulation of algal blooms in Antarctic shelf waters by the release of iron from melting sea ice. Geophysical Research Letters, 24, 25152518.
Sedwick, P.N., DiTullio, G.R. & Mackey, D.J. 2000. Iron and manganese in the Ross Sea, Antarctica: seasonal iron limitation in Antarctic shelf waters. Journal of Geophysical Research - Oceans, 105, 11 32111 336.
Sedwick, P.N., Marsay, C.M., Sohst, B.M., Aguilar-Islas, A.M., Lohan, M.C., Long, M.C., Arrigo, K.R., Dunbar, R.B., Saito, M.A., Smith, W.O. & DiTullio, G.R. 2011. Early season depletion of dissolved iron in the Ross Sea polynya: implications for iron dynamics on the Antarctic continental shelf. Journal of Geophysical Research - Oceans, 116, 10.1029/2010JC006553.
Wagener, T., Guieu, C., Losno, R., Bonnet, S. & Mahowald, N. 2008. Revisiting atmospheric dust export to the Southern Hemisphere ocean: biogeochemical implications. Global Biogeochemical Cycles, 22, 10.1029/2007GB002984.
Wasserburg, G.J., Jacousen, S.B., DePaolo, D.J., McCulloch, M.T. & Wen, T. 1981. Precise determination of Sm/Nd ratios, Sm and Nd isotopic abundances in standard solutions. Geochimica et Cosmochimica Acta, 45, 23112323.
Winton, V.H.L., Dunbar, G.B., Bertler, N.A.N., Millet, M.A., Delmonte, B., Atkins, C.B., Chewings, J.M. & Andersson, P. 2014. The contribution of aeolian sand and dust to iron fertilization of phytoplankton blooms in southwestern Ross Sea, Antarctica. Global Biogeochemical Cycles, 28, 10.1002/2013GB004574.
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Antarctic Science
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