USF Marine Metal Isotope and Trace Element Laboratory



60. Kurisu, M., Sokata, K., Nishioka, J., Obata, H., Conway, T. M., Hunt, H. R., Sieber, M., Suzuki, K., Kashiwabara, T., and Takahashi, Y. (2024). Source and fate of atmospheric iron supplied to the subarctic North Pacific traced by stable isotope ratios. Geochimica Cosmochimica Acta. In Revision.
59. Li, J., Babcock-Adams, L., Boiteau, R. M., Sieber, M., Lanning, N. T., Manck, L. E., Bundy, R. M., Bian, X., Streanga, J.-M., Granzow,  B. N., Church, M. J., Fitzsimmons, J. N., John, S.G., Conway, T. M., and Repeta, D. (2024). Iron limitation in the ocean’s twilight zone. Nature. Accepted.
58. Conway, T. M., and Middag, R. (2024). Controls and Distributions of Trace Elements in the Ocean. In Treatise of Geochemistry 3rd Edition. In Press.
57. Bian, X., Yang, S.-C., Raad, R. J., Hawco, N. J., Sakowski, J., Kong, K. P., Conway, T. M., and John. S. G. (2024). A rapid method for isotopic purification of copper and nickel from seawater using an automated chromatography system. Analytica Chimica Acta. 1312, 342753.
56. Kim, J., Park, K. Y., Koo, T.-H., Jung, J., Kang, I., Kim, K., Park, H., Yoo, K.-C., Rosenheim, B. E., and Conway, T. M. (2024). Microbially-mediated reductive dissolution of Fe-bearing minerals during freeze-thaw cyclesGeochimica Cosmochimica Acta. 376, 134-143.
55. Conway, T. M., Middag, R., and Schlitzer, R. (2024). GEOTRACES: ironing out the details of the oceanic iron sources? Oceanography. 27(2), 35-45.
54. Conway, T. M., Fitzsimmons, J. N., Middag, R., Noble, T. L., and Planquette, H. F. (2024). An Introduction to the Special Issue - Twenty Years of GEOTRACES: An International Study of Trace Elements and Isotopes. Oceanography. 27(2), 6-7.
53. Buckley, N. R., Black, E. B., Kenyon, J. A., Lanning, N. T., Sieber, M., Conway, T. M., Fitzsimmons, J. N., and Cutter, G. A. (2024). Re-evaluating hydrogen sulfide as a sink for cadmium and zinc in the oxic to suboxic upper water column of the Pacific Ocean. Global Biogeochemical Cycles. 38, 3, e2023GB007881.
52. Boiteau, R., Corilo, Y. E., Kew, W. R., Dewey, C., Alvarez Rodriguez, M. C., Carlson, C. A., and Conway, T. M. (2024). Relating Molecular Properties to the Persistence of Marine Dissolved Organic Matter with Liquid Chromatography-Ultrahigh-Resolution Mass Spectrometry. Environmental Science and Technology. 58, 7, 3267–3277.
51. Ruan, Y., Zheng, R., Yang, S.-C., Jiang, Z., Chen, S., Conway, T. M., Huang, K.-F., Boyle, E. A., Zhou, M., and John, S. G. (2024). Iron, Nickel, Copper, Zinc, and their stable isotopes along a salinity gradient in the Pearl River Estuary, southeastern China. Chemical Geology. 645, 121893.


50. Tian, H.-A., van Manen, M., Bunnell, Z. B., Jung, J., Hoon Lee, S., Kim, T.-W., Reichart, G.-J., Conway, T. M., and Middag. R. (2023). Biogeochemistry of iron in coastal Antarctica: isotopic insights for external sources and biological uptake in the Amundsen Sea polynyas. Geochimica et Cosmochimica Acta. 363. 51-67.
49. Fourquez, M., Janssen, D. J., Cabanes, D., Conway, T. M., Ellwood, M. E., Sieber, M., Trimborn, S., and Hassler, C. (2023). Chasing iron bioavailability in the Southern Ocean: Insights from Phaeocystis antarctica and iron speciation. Science Advances. 9, eadf969.
48. Sieber, M., Lanning, N. T., Bian, X., Yang, S.-C., Takano, S., Sohrin, Y., Weber, T. S., Fitzsimmons, J. N., John, S. G., and Conway, T. M. (2023). The importance of reversible scavenging for the marine zinc cycle evidenced by the distribution of zinc and zinc isotopes in the Pacific Ocean. Journal of Geophysical Research: Oceans. 128 (4), e2022JC019419.
47. Tian, H.-A., van Manen, M., Laan, P., Wille, F., Jung, J., Hoon Lee, S., Kim, T.-W., Aoki, S., Eich, C., Brussaard, C., Reichart, G.-J., Conway, T. M., and Middag. R. (2023). The biogeochemistry of zinc and cadmium in the Amundsen Sea, coastal Antarctica. Marine Chemistry. 249, 104223.
46. Fitzsimmons, J. N., and Conway, T. M. (2023). Novel Insights into marine iron biogeochemistry from iron isotopes. Annual Reviews of Marine Science. 15. 383-406.
45. Sieber, M., Lanning, N. T., Bunnell, Z. B., Bian, X., Yang, S.-C., Marsay, C. M., Landing, W. M., Buck, C. S., Fitzsimmons, J. N., John, S. G., and Conway, T. M. (2023). Biological, physical, and atmospheric controls on the distribution of cadmium and its isotopes in the Pacific Ocean. Global Biogeochemical Cycles. 37 (2), e2022GB007441.
44. Middag, R., Zitoun, R., and Conway, T. M. (2023). Trace Metals. In Marine Analytical Chemistry. Eds. Blasco, J., and Tovar-Sánchez. Springer, Cham. pp 103-198.


43. Ng, C. H., Hawkings, J. R., Betrand, S., Summers, B. A., Sieber, M., Conway, T. M., Freitas, F. S., Ward, J. P. J., Pryer, H. V., Wadham, J. L., and Hendry, K. R. (2022). Benthic dissolved silicon and iron cycling at Patagonian glaciated fjord heads. Global Biogeochemical Cycles. 36, e2022GB007493.
42. Hunt, H., Summers, B. A., Sieber, M., Krisch, S., Al-Hashem, A., Hopwood, M., Achterberg, E. P., and Conway, T. M. (2022). Distinguishing the influence of sediments, the Congo River, and water-mass mixing on the distribution of iron and its isotopes in the Southeast Atlantic Ocean. Marine Chemistry. 247. 104181.
41. van Manen, M., Aoki, S., Brussard, C. P. D., Conway, T. M., Eich, C., Gerringa, L, Jung, J., Kim, T.-W., Hoon Lee, S., Youngju, L. Reichart, K., Tian, H.-A., Willie, F., and Middag, R. (2022). The role of the Dotson Ice Shelf and circumpolar deepwater as driver and source of dissolved and particulate iron and manganese in the Amundsen Sea Polynya, Southern Ocean. Marine Chemistry. 246. 104061.
40. John, S. G., Kelly, R., Bian, X., Fu, F., Smith, M. I., Lanning, N. T., Liang, H., Pasquier, B., Seelen, E. A., Holzer, M., Wasylenki, L. E., Conway, T. M., Fitzsimmons, J. N., Hutchins, D., and Yang, S. C. (2022). The biogeochemical balance of oceanic nickel cycling. Nature Geoscience. 15. 906-912.
39. König, D., Conway, T. M., Hamilton, D. S., and Tagliabue, A. (2022). Surface ocean biogeochemistry regulates the impact of anthropogenic aerosol Fe deposition on the cycling of Fe and Fe isotopes in the North Pacific. Geophysical Research Letters. 49 (13), e2022GL098016. 
38. de Souza, G. F., Vance, D., Sieber, M., Conway, T. M., and Little, S. H. (2022). Re-assessing the influence of water-column sulphide on the marine cadmium cycle. Geochimica et Cosmochimica Acta. 322, 274-296.


37. Horner, T. J., Little, S. H., Conway, T. M., Farmer, J. R., Hertzberg, J. E., Janssen, D. J., Lough, A. J. M., Mckay, J., Tessin, A., Galer, S. J. G., Jaccard, S. L., Lacan, F., Paytan, A., Wuttig, K., and GEOTRACES–PAGES Biological Productivity Working Group Members. (2021). Bioactive trace metals and their isotopes as paleoproductivity proxies: An assessment using GEOTRACES-era data. Global Biogeochemical Cycles. 35, 11, e2020GB006814.
36. König, D., Conway, T. M., Ellwood, M. J., Homoky, W. B., and Tagliabue, A. (2021). Constraints on the cycling of iron isotopes from a global ocean model. Global Biogeochemical Cycles. 35, 9, e2021GB006968.
35. Yang, S.-C., Kelly, R., Bian, X., Conway, T. M., Huang, K.-F., Ho, T.-Y., Keil, R. G., Moffett, J. W., and John, S. G. (2021). Lack of Redox Cycling for Nickel in the Water Column of the Eastern Tropical North Pacific Oxygen Deficient Zone: Insight from Dissolved and Particulate Nickel Isotopes. Geochimica et Cosmochimica Acta. 309, 235-250
34. Conway, T. M., Horner, T. J., Plancherel, Y., and González, A.G. (2021). A decade of progress in understanding cycles of trace elements and their isotopes in the oceans. Chemical Geology. 580, 120381.
33. Krisch, S. Hopwood, M. J., Schaffer, J., Al-Hashem, A., Höfer, J., van de Loeff, R., Conway, T. M., Summers, B. A., Lodeiro, P., Ardiningsih, I., Steffens, T., and Achterberg, E. P. (2021). The 79°N Glacier cavity modulates subglacial iron export to the NE Greenland Shelf. Nature Communications. 12, 3030.
32. Sieber, M., Conway, T. M., de Souza, G. F., Hassler, C.S., Ellwood, M.J., and Vance, D. (2021). Isotopic fingerprinting of biogeochemical processes and iron sources in the iron-limited surface Southern Ocean. Earth and Planetary Science Letters. 567, 116967.
31. Homoky, W. B., Conway, T. M., John, S. G., König, D., Deng, F., Tagliabue, A., and Mills, R. (2021). Iron colloids dominate sedimentary supply to the ocean interior. Proceedings of the National Academy of Sciences USA. 118 (13), e2016078118.


30. Janssen, D. J., Sieber, M., Ellwood, M. E., Conway, T. M., Barrett, P., Chen, X., de Souza, G. F., Hassler, C. S., and Jaccard, S. L. (2020). Trace metal and nutrient dynamics across broad biogeochemical gradients in the Indian and Pacific sectors of the Southern Ocean. Marine Chemistry. 221, 103773.
29. Sieber, M., Conway, T. M., de Souza, G. F., Hassler, C. S., Ellwood, M, and Vance, D. (2020). Cycling of Zn and its isotopes across multiple zones of the Southern Ocean: Insights from the Antarctic Circumnavigation Expedition. Geochimica et Cosmochimica Acta. 268, 310-324.


28. Jung, J., Rosenheim, B. E., Conway, T. M., Kyu-Cheul, Y., Il Lee, J., Il Yoon, H., Hwang, C. Y., Yang, K., Subt, C., and Kim, J. (2019). Microbial Fe(III) reduction as a potential iron source from Holocene sediments beneath Larsen Ice Shelf. Nature Communications. 10, 5786.
27. Sieber, M., Conway, T. M., de Souza, G. F., Hassler, C. S., Ellwood, M, and Vance, D. (2019). High-resolution Cd isotope systematics in multiple zones of the Southern Ocean from the Antarctic Circumnavigation Expedition. Earth and Planetary Science Letters. 527, 115799.
26. Conway, T. M., Hamilton, D. S., Shelley, R. U., Aguilar-Islas, A. M., Landing, W. M., Mahowald, N., and John, S. G. (2019). Tracing and constraining anthropogenic aerosol iron fluxes to the North Atlantic Ocean using iron isotopes. Nature Communications. 10, 2628.
25. Sieber, M., Conway, T. M., de Souza, G. F., Obata, H., Takano, S., Sohrin, Y., and Vance, D. (2019). Physical and biogeochemical controls on the distribution of dissolved cadmium and its isotopes in the Southwest Pacific OceanChemical Geology. 511, 494-509.


24. Hayes, C. T., Anderson, R. F., Cheng, H., Conway, T. M., Edwards, L., Fleisher, M. Q., Huang, K.-F., John, S. G., Landing, W. M., Little, S. H., Lu, Y., Morton, P. L., Moran, B., Robinson, L. F., Shelley, R. U., Shiller, A. M., and Zheng, X. (2018). Replacement times of a spectrum of elements in the North Atlantic based on thorium supply. Global Biogeochemical Cycles, 32, 1294-1311.
23. Conway, T. M., Palter, J. B., and de Souza, G. F. (2018). Gulf Stream rings as a source of iron to the North Atlantic subtropical gyreNature Geoscience, 11, 594-598.
22. Schlitzer, R. et al. (including Conway, T. M.) (2018). The GEOTRACES Intermediate Data Product 2017. Chemical Geology, 493, 210-223.


21. Saito, M., Noble, A., Hawco, N., Twining, B. S., Ohnemus, D. C., John, S. G., Lam, P., Conway, T. M., Johnson, R., Moran, D., and McIlvin, M. (2017). The Acceleration of Dissolved Cobalt’s Ecological Stoichiometry due to Biological Uptake, Remineralization, and Scavenging in the Atlantic Ocean. Biogeosciences, 14(20), 4637-4662.
20. Archer, C., Andersen, M., Cloquet, C., Conway, T. M., Dong, S., Ellwood, M., Moore, R., Nelson, J., Rehkämper, M., Rouxel, O., Samanta, M., Shin, K.-C., Sohrin, Y., Takano, S., and Wasylenki, L. (2017). Inter-calibration of a new proposed primary reference standard AA-ETH Zn for Zn isotopic analysis. Journal of Analytical Atomic Spectrometry, 32, 415-419


19. Fitzsimmons, J. N., Conway, T. M., Lee, J.-M., Kayser, R., Thyng, K. M., John, S. G., and Boyle, E. A. (2016). Dissolved iron and iron isotopes in the Southeastern Pacific Ocean. Global Biogeochemical Cycles, 30(10), 1372-1395.
18. Homoky, W.B., Weber, T. S., Berelson, W. M., Conway, T. M., Henderson, G. M., van Hulten, M., Jeandel, C., Severmann, S., and Tagliabue, A. (2016). Quantifying trace element and isotope fluxes at the ocean-sediment boundary - a review. Philosophical Transactions of the Royal Society A, 374, 20160246.
17. Conway, T. M., Hoffmann, L. J., Breitbarth, E., Strzepek, R. F., and Wolff, E. W. (2016). The growth response of two diatom species to atmospheric dust from the Last Glacial Maximum. PLoS ONE, 11(7), e0158553.
16. Conway, T. M., John, S. G., and Lacan, F. (2016). Intercomparison of dissolved iron isotope profiles from reoccupation of three GEOTRACES stations in the Atlantic Ocean. Marine Chemistry, 183, 50-61.


15. Middag, R., Sefarian, R., Conway, T. M., John, S. G., Bruland, K. W., and de Baar, H. J. W. (2015). Intercomparison of Dissolved Trace Elements at the Bermuda Atlantic Time Series Station. Marine Chemistry, 177(3), 476-479.
14. Mawji, E. et al. (including Conway, T. M.) (2015). The GEOTRACES Intermediate Data Product 2014. Marine Chemistry, 177(1), 1-8.
13. Conway, T. M., Wolff, E.W., Röthlisberger, R., Mulvaney, R., and Elderfield, H. (2015). Constraints on soluble aerosol iron flux to the Southern Ocean at the Last Glacial Maximum. Nature Communications, 6, 7850.
12. Conway, T. M. and John, S. G. (2015). The cycling of iron, zinc and cadmium in the North East Pacific Ocean - insights from stable isotopes. Geochimica et Cosmochimica Acta, 164(1), 262-283.
11. Revels, B. N, Ohnemus, D. C., Lam, P. J., Conway, T. M., and John, S. G. (2015). The isotopic signature and distribution of particulate iron in the North Atlantic Ocean. Deep Sea Research Part II, 116, 321-331.
10. Fitzsimmons, J. N., Carrasco, G. G., Wu, J., Roshan, S., Hatta, M., Measures C. I., Conway T. M., John, S. G., and Boyle, E. A. (2015). Partitioning of dissolved iron and iron isotopes into soluble and colloidal phases along the U.S. GEOTRACES North Atlantic Transect. Deep Sea Research Part II, 116, 130-151.
9. Conway, T. M. and John, S. G. (2015). Biogeochemical cycling of cadmium isotopes along a high-resolution section through the North Atlantic Ocean. Geochimica et Cosmochimica Acta, 148(1). 269-283


8. Conway, T. M. and John, S. G. (2014). The biogeochemical cycling of zinc and zinc isotopes in the North Atlantic Ocean. Global Biogeochemical Cycles, 28(10). 1111-1128
7. Conway, T. M. and John, S G. (2014). Quantification of dissolved iron sources to the North Atlantic Ocean. Nature, 511, 212-215.
6. Janssen, D., Conway, T. M., John, S. G., Christian, J., Kramer, D. L., Pederson, T. F., and Cullen, J. T. (2014). Undocumented water column sink for cadmium in open ocean oxygen deficient zones. Proceedings of the National Academy of Sciences USA, 111(19), 6888-6893.
5. John, S. G. and Conway, T. M. (2014). A role for scavenging in the marine biogeochemical cycling of zinc and zinc isotopes. Earth and Planetary Science Letters, 394. 159-167.


4. Homoky, W. B., John, S. G., Conway T. M., and Mills, R. A. (2013). Distinct iron isotopic signatures and supply from marine sediment dissolution. Nature Communications, 4, 2143.
3. Conway, T. M., Rosenberg, A. D., Adkins, J. F., and John, S. G. (2013). A new method for precise determination of iron, zinc and cadmium stable isotope ratios in seawater by double-spike mass spectrometry. Analytica Chimica Acta, 793, 44-52.


2. Conway, T. M. and Botting, J. P. (2012). A new Middle Ordovician (Llanvirn) odontopleurid trilobite from the Builth Inlier of Mid-Wales, and a review of the genus Meadowtownella. Geological Magazine, 149(3), 397-411.


1. Li, G., Chen, J., Ji, J., Yang, J., and Conway, T. M. (2009). Natural Sources of East Asian Dust. Geology, 37(8), 727-730