Iron persistence in a distal hydrothermal plume supported by dissolved–particulate exchange
Fitzsimmons, Jessica N.
John, Seth G.
Marsay, Christopher M.
Hoffman, Colleen L.
Nicholas, Sarah L.
Toner, Brandy M.
German, Christopher R.
Sherrell, Robert M.
MetadataShow full item record
Hydrothermally-sourced dissolved metals have been recorded in all ocean basins. In the oceans’ largest known hydrothermal plume, extending westward across the Pacific from the Southern East Pacific Rise, dissolved iron and manganese were shown by the GEOTRACES program to be transported halfway across the Pacific. Here, we report that particulate iron and manganese in the same plume also exceed background concentrations, even 4000 km from the source. Both dissolved and particulate iron deepen by more than 350 m relative to 3He – a non-reactive tracer of hydrothermal input – crossing isopycnals. Manganese shows no similar descent. Individual plume particle analyses indicate that particulate iron occurs within low-density organic matrices, consistent with its slow sinking rate of 5-10 m year-1. Chemical speciation and isotopic composition analyses reveal that particulate iron consists of Fe(III) oxyhydroxides, while dissolved iron consists of nanoparticulate Fe(III) oxyhydroxides and an organically-complexed iron phase. The descent of plume dissolved iron is best explained by reversible exchange onto slowly sinking particles, likely mediated by organic compounds binding iron. We suggest that in ocean regimes with high particulate iron loadings, dissolved iron fluxes may depend on the balance between stabilization in the dissolved phase and the reversibility of exchange onto sinking particles.
Author Posting. © The Author(s), 2017. This is the author's version of the work. It is posted here under a nonexclusive, irrevocable, paid-up, worldwide license granted to WHOI. It is made available for personal use, not for redistribution. The definitive version was published in Nature Geoscience 10 (2017): 195-201, doi:10.1038/ngeo2900.
Suggested CitationPreprint: Fitzsimmons, Jessica N., John, Seth G., Marsay, Christopher M., Hoffman, Colleen L., Nicholas, Sarah L., Toner, Brandy M., German, Christopher R., Sherrell, Robert M., "Iron persistence in a distal hydrothermal plume supported by dissolved–particulate exchange", 2017-01, https://doi.org/10.1038/ngeo2900, https://hdl.handle.net/1912/8849
Showing items related by title, author, creator and subject.
The discovery of new deep-sea hydrothermal vent communities in the Southern Ocean and implications for biogeography Rogers, Alex D.; Tyler, Paul A.; Connelly, Douglas P.; Copley, Jonathan T.; James, Rachael H.; Larter, Robert D.; Linse, Katrin; Mills, Rachel A.; Naveira Garabato, Alberto C.; Pancost, Richard D.; Pearce, David A.; Polunin, Nicholas V. C.; German, Christopher R.; Shank, Timothy M.; Boersch-Supan, Philipp H.; Alker, Belinda J.; Aquilina, Alfred; Bennett, Sarah A.; Clarke, Andrew; Dinley, Robert J. J.; Graham, Alastair G. C.; Green, Darryl R. H.; Hawkes, Jeffrey A.; Hepburn, Laura; Hilario, Ana; Huvenne, Veerle A. I.; Marsh, Leigh; Ramirez-Llodra, Eva; Reid, William D. K.; Roterman, Christopher N.; Sweeting, Christopher J.; Thatje, Sven; Zwirglmaier, Katrin (Public Library of Science, 2012-01-03)Since the first discovery of deep-sea hydrothermal vents along the Galápagos Rift in 1977, numerous vent sites and endemic faunal assemblages have been found along mid-ocean ridges and back-arc basins at low to mid latitudes. ...
Gledhill, Dwight K.; White, Meredith M.; Salisbury, Joseph E.; Thomas, Helmuth; Mlsna, Ivy; Liebman, Matthew; Mook, Bill; Grear, Jason S.; Candelmo, Allison C.; Chambers, R. Christopher; Gobler, Christopher J.; Hunt, Christopher W.; King, Andrew L.; Price, Nichole N.; Signorini, Sergio R.; Stancioff, Esperanza; Stymiest, Cassie; Wahle, Richard A.; Waller, Jesica D.; Rebuck, Nathan D.; Wang, Zhaohui Aleck; Capson, Todd L.; Morrison, J. Ruairidh; Cooley, Sarah R.; Doney, Scott C. (The Oceanography Society, 2015-06)New England coastal and adjacent Nova Scotia shelf waters have a reduced buffering capacity because of significant freshwater input, making the region’s waters potentially more vulnerable to coastal acidification. Nutrient ...
Kunz, Clayton G.; Murphy, Christopher A.; Singh, Hanumant; Pontbriand, Claire W.; Sohn, Robert A.; Singh, Sandipa; Sato, Taichi; Roman, Christopher N.; Nakamura, Ko-ichi; Jakuba, Michael V.; Eustice, Ryan M.; Camilli, Richard; Bailey, John (2009-01-12)This paper describes the design and use of two new autonomous underwater vehicles, Jaguar and Puma, which were deployed in the summer of 2007 at sites at 85°N latitude in the ice-covered Arctic Ocean to search for ...