• Login
    About WHOAS
    View Item 
    •   WHOAS Home
    • Woods Hole Oceanographic Institution
    • Geology and Geophysics (G&G)
    • View Item
    •   WHOAS Home
    • Woods Hole Oceanographic Institution
    • Geology and Geophysics (G&G)
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of WHOASCommunities & CollectionsBy Issue DateAuthorsTitlesKeywordsThis CollectionBy Issue DateAuthorsTitlesKeywords

    My Account

    LoginRegister

    Statistics

    View Usage Statistics

    The iron isotopic composition of subglacial streams draining the Greenland Ice Sheet

    Thumbnail
    View/Open
    Stevenson Fe WHOI.pdf (2.300Mb)
    Date
    2017-06
    Author
    Stevenson, Emily I.  Concept link
    Fantle, Matthew S.  Concept link
    Das, Sarah B.  Concept link
    Williams, Helen M.  Concept link
    Aciego, Sarah M.  Concept link
    Metadata
    Show full item record
    Citable URI
    https://hdl.handle.net/1912/9217
    As published
    https://doi.org/10.1016/j.gca.2017.06.002
    Abstract
    In this study, we present the first measurements of iron (Fe) stable isotopic composition (δ56Fe) of subglacial streams draining the Greenland Ice Sheet (GIS). We measure the δ56Fe values [(δ56Fe, ‰ = (56Fe/54Fe)sample/(56Fe/54Fe)standard-1) x 103] of both dissolved and suspended sediment Fe in subglacial outflows from five distinct land-terminating glaciers. Suspended sediments have δ56Fe values that lie within the crustal array (δ56Fe ~0‰). In contrast, the δ56Fe values of dissolved Fe in subglacial outflows are consistently less than 0‰, reaching a minimum of -2.1‰ in the outflow from the Russell Glacier. The δ56Fe values of dissolved Fe vary geographically and on daily time scales. Major element chemistry and mineral saturation state modeling suggest that incongruent silicate weathering and sulphide oxidation are the likely drivers of subglacial stream Fe chemistry, and that the extent of chemical weathering influences the δ56Fe of dissolved Fe. The largest difference in δ56Fe between dissolved and suspended load is -2.1‰, and occurs in the subglacial system from the Russell glacier (southwest GIS). Major element chemistry indicates this outflow to be the least chemically weathered, while more mature subglacial systems (i.e., that exhibit greater extents of subglacial weathering) have dissolved loads with δ56Fe that are indistinguishable from suspended sediments (Δ56Fesuspended-dissolved ~0‰). Ultimately, the dissolved Fe generated in some subglacial systems from the GIS is a previously unrecognized source of isotopically light Fe into the hydrosphere. The data illustrate that the dissolved Fe supplied by subglacial weathering can have variable δ56Fe values depending on the degree of chemical weathering. Thus, Fe isotopes have potential as a proxy for subglacial chemical weathering intensity or mode. Finally, based on our regional Fe concentration measurements from each glacial outflow, we estimate a flux weighted continental scale dissolved iron export of 2.1 Gg Fe yr-1 to the coastal ocean, which is within the range of previous estimates.
    Description
    © 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 Geochimica et Cosmochimica Acta 213 (2017): 237-254, doi:10.1016/j.gca.2017.06.002.
    Collections
    • Geology and Geophysics (G&G)
    Suggested Citation
    Preprint: Stevenson, Emily I., Fantle, Matthew S., Das, Sarah B., Williams, Helen M., Aciego, Sarah M., "The iron isotopic composition of subglacial streams draining the Greenland Ice Sheet", 2017-06, https://doi.org/10.1016/j.gca.2017.06.002, https://hdl.handle.net/1912/9217
     

    Related items

    Showing items related by title, author, creator and subject.

    • Thumbnail

      Noble gas signatures in Greenland : tracing glacial meltwater sources 

      Niu, Yi; Castro, M. Clara; Aciego, Sarah M.; Hall, Chris M.; Stevenson, Emily I.; Arendt, Carli A.; Das, Sarah B. (John Wiley & Sons, 2015-11-06)
      This study represents the first comprehensive noble gas study in glacial meltwater from the Greenland Ice Sheet. It shows that most samples are in disequilibrium with surface collection conditions. A preliminary Ne and Xe ...
    • Thumbnail

      BioTIME : a database of biodiversity time series for the Anthropocene 

      Dornelas, Maria; Antao, Laura H.; Moyes, Faye; Bates, Amanda E.; Magurran, Anne E.; Adam, Dusan; Akhmetzhanova, Asem A.; Appeltans, Ward; Arcos, Jose Manuel; Arnold, Haley; Ayyappan, Narayanan; Badihi, Gal; Baird, Andrew H.; Barbosa, Miguel; Barreto, Tiago Egydio; Bässler, Claus; Bellgrove, Alecia; Belmaker, Jonathan; Benedetti-Cecchi, Lisandro; Bett, Brian J.; Bjorkman, Anne D.; Błazewicz, Magdalena; Blowes, Shane A.; Bloch, Christopher P.; Bonebrake, Timothy C.; Boyd, Susan; Bradford, Matt; Brooks, Andrew J.; Brown, James H.; Bruelheide, Helge; Budy, Phaedra; Carvalho, Fernando; Castaneda-Moya, Edward; Chen, Chaolun Allen; Chamblee, John F.; Chase, Tory J.; Collier, Laura Siegwart; Collinge, Sharon K.; Condit, Richard; Cooper, Elisabeth J.; Cornelissen, Johannes H. C.; Cotano, Unai; Crow, Shannan Kyle; Damasceno, Gabriella; Davies, Claire H.; Davis, Robert A.; Day, Frank P.; Degraer, Steven; Doherty, Tim S.; Dunn, Timothy E.; Durigan, Giselda; Duffy, J. Emmett; Edelist, Dor; Edgar, Graham J.; Elahi, Robin; Elmendorf, Sarah C.; Enemar, Anders; Ernest, S. K. Morgan; Escribano, Ruben; Estiarte, Marc; Evans, Brian S.; Fan, Tung-Yung; Farah, Fabiano Turini; Fernandes, Luiz Loureiro; Farneda, Fabio Z.; Fidelis, Alessandra; Fitt, Robert; Fosaa, Anna Maria; Franco, Geraldo Antonio Daher Correa; Frank, Grace E.; Fraser, William R.; García, Hernando; Gatti, Roberto Cazzolla; Givan, Or; Gorgone-Barbosa, Elizabeth; Gould, William A.; Gries, Corinna; Grossman, Gary D.; Gutierrez, Julio R.; Hale, Stephen; Harmon, Mark E.; Harte, John; Haskins, Gary; Henshaw, Donald L.; Hermanutz, Luise; Hidalgo, Pamela; Higuchi, Pedro; Hoey, Andrew S.; Hoey, Gert Van; Hofgaard, Annika; Holeck, Kristen; Hollister, Robert D.; Holmes, Richard; Hoogenboom, Mia; Hsieh, Chih-hao; Hubbell, Stephen P.; Huettmann, Falk; Huffard, Christine L.; Hurlbert, Allen H.; Ivanauskas, Natalia Macedo; Janík, David; Jandt, Ute; Jazdzewska, Anna; Johannessen, Tore; Johnstone, Jill F.; Jones, Julia; Jones, Faith A. M.; Kang, Jungwon; Kartawijaya, Tasrif; Keeley, Erin C.; Kelt, Douglas A.; Kinnear, Rebecca; Klanderud, Kari; Knutsen, Halvor; Koenig, Christopher C.; Kortz, Alessandra R.; Kral, Kamil; Kuhnz, Linda A.; Kuo, Chao-Yang; Kushner, David J.; Laguionie-Marchais, Claire; Lancaster, Lesley T.; Lee, Cheol Min; Lefcheck, Jonathan S.; Levesque, Esther; Lightfoot, David; Lloret, Francisco; Lloyd, John D.; Lopez-Baucells, Adria; Louzao, Maite; Madin, Joshua S.; Magnusson, Borgbor; Malamud, Shahar; Matthews, Iain; McFarland, Kent P.; McGill, Brian; McKnight, Diane; McLarney, William O.; Meador, Jason; Meserve, Peter L.; Metcalfe, Daniel J.; Meyer, Christoph F. J.; Michelsen, Anders; Milchakova, Nataliya; Moens, Tom; Moland, Even; Moore, Jon; Moreira, Carolina Mathias; Muller, Jorg; Murphy, Grace; Myers-Smith, Isla H.; Myster, Randall W.; Naumov, Andrew; Neat, Francis; Nelson, James A.; Nelson, Michael Paul; Newton, Stephen F.; Norden, Natalia; Oliver, Jeffrey C.; Olsen, Esben M.; Onipchenko, Vladimir G.; Pabis, Krzysztof; Pabst, Robert J.; Paquette, Alain; Pardede, Sinta; Paterson, David M.; Pelissier, Raphael; Penuelas, Josep; Perez-Matus, Alejandro; Pizarro, Oscar; Pomati, Francesco; Post, Eric; Prins, Herbert H. T.; Priscu, John C.; Provoost, Pieter; Prudic, Kathleen L.; Pulliainen, Erkki; Ramesh, B. B.; Ramos, Olivia Mendivil; Rassweiler, Andrew; Rebelo, Jose Eduardo; Reed, Daniel C.; Reich, Peter B.; Remillard, Suzanne M.; Richardson, Anthony J.; Richardson, J. Paul; Rijn, Itai van; Rocha, Ricardo; Rivera-Monroy, Victor H.; Rixen, Christian; Robinson, Kevin P.; Rodrigues, Ricardo Ribeiro; Rossa-Feres, Denise de Cerqueira; Rudstam, Lars; Ruhl, Henry A.; Ruz, Catalina S.; Sampaio, Erica M.; Rybicki, Nancy; Rypel, Andrew; Sal, Sofia; Salgado, Beatriz; Santos, Flavio A. M.; Savassi-Coutinho, Ana Paula; Scanga, Sara; Schmidt, Jochen; Schooley, Robert; Setiawan, Fakhrizal; Shao, Kwang-Tsao; Shaver, Gaius R.; Sherman, Sally; Sherry, Thomas W.; Sicinski, Jacek; Sievers, Caya; da Silva, Ana Carolina; da Silva, Fernando Rodrigues; Silveira, Fabio L.; Slingsby, Jasper; Smart, Tracey; Snell, Sara J.; Soudzilovskaia, Nadejda A.; Souza, Gabriel B. G.; Souza, Flaviana Maluf; Souza, Vinícius Castro; Stallings, Christopher D.; Stanforth, Rowan; Stanley, Emily H.; Sterza, Jose Mauro; Stevens, Maarten; Stuart-Smith, Rick; Suarez, Yzel Rondon; Supp, Sarah; Tamashiro, Jorge Yoshio; Tarigan, Sukmaraharja; Thiede, Gary P.; Thorn, Simon; Tolvanen, Anne; Toniato, Maria Teresa Zugliani; Totland, Orjan; Twilley, Robert R.; Vaitkus, Gediminas; Valdivia, Nelson; Vallejo, Martha Isabel; Valone, Thomas J.; Van Colen, Carl; Vanaverbeke, Jan; Venturoli, Fabio; Verheye, Hans M.; Vianna, Marcelo; Vieira, Rui P.; Vrska, Tomas; Vu, Con Quang; Vu, Lien Van; Waide, Robert B.; Waldock, Conor; Watts, David; Webb, Sara; Wesołowski, Tomasz; White, Ethan P.; Widdicombe, Claire E.; Wilgers, Wilgers; Williams, Richard; Williams, Stefan B.; Williamson, Mark; Willig, Michael R.; Willis, Trevor J.; Wipf, Sonja; Woods, Kerry D.; Woehler, Eric; Zawada, Kyle; Zettler, Michael L. (John Wiley & Sons, 2018-07-24)
      The BioTIME database contains raw data on species identities and abundances in ecological assemblages through time. These data enable users to calculate temporal trends in biodiversity within and amongst assemblages using ...
    • Thumbnail

      Episodic Southern Ocean heat loss and its mixed layer impacts revealed by the farthest south multiyear surface flux mooring 

      Ogle, Sarah E.; Tamsitt, Veronica; Josey, Simon A.; Gille, Sarah T.; Ceroveˇcki, Ivana; Talley, Lynne D.; Weller, Robert A. (John Wiley & Sons, 2018-05-28)
      The Ocean Observatories Initiative air‐sea flux mooring deployed at 54.08°S, 89.67°W, in the southeast Pacific sector of the Southern Ocean, is the farthest south long‐term open ocean flux mooring ever deployed. Mooring ...
    All Items in WHOAS are protected by original copyright, with all rights reserved, unless otherwise indicated. WHOAS also supports the use of the Creative Commons licenses for original content.
    A service of the MBLWHOI Library | About WHOAS
    Contact Us | Send Feedback | Privacy Policy
    Core Trust Logo