Articles | Volume 25, issue 14
https://doi.org/10.5194/acp-25-8213-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-25-8213-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
30 Jul 2025
Research article |
| 30 Jul 2025
| 30 Jul 2025
Iron isotopes suggest significant aerosol dissolution over the Pacific Ocean
Université de Toulouse, LEGOS (CNES/CNRS/IRD/UT), Toulouse, France
Université de Toulouse, LEGOS (CNES/CNRS/IRD/UT), Toulouse, France
Catherine Pradoux
Université de Toulouse, LEGOS (CNES/CNRS/IRD/UT), Toulouse, France
Marie Labatut
Université de Toulouse, LEGOS (CNES/CNRS/IRD/UT), Toulouse, France
Anne Johansen
Department of Chemistry, Central Washington University, Ellensburg, Washington, USA
James W. Murray
School of Oceanography, University of Washington, Seattle, Washington, USA
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Cited articles
Abadie, C., Lacan, F., Radic, A., Pradoux, C., and Poitrasson, F.: Iron isotopes reveal distinct dissolved iron sources and pathways in the intermediate versus deep Southern Ocean, P. Natl. Acad. Sci. USA, 114, 858–863, https://doi.org/10.1073/pnas.1603107114, 2017.
Baker, A. R. and Jickells, T. D.: Mineral particle size as a control on aerosol iron solubility, Geophys. Res. Lett., 33, L17608, https://doi.org/10.1029/2006GL026557, 2006.
Beard, B. L., Johnson, C. M., Skulan, J. L., Nealson, K. H., Cox, L., and Sun, H.: Application of Fe isotopes to tracing the geochemical and biological cycling of Fe, Chem. Geol., 195, 87–117, https://doi.org/10.1016/S0009-2541(02)00390-X, 2003.
Boyd, P. W. and Ellwood, M. J.: The biogeochemical cycle of iron in the ocean, Nat. Geosci., 3, 675–682, https://doi.org/10.1038/ngeo964, 2010.
Boyle, E. A., John, S., Abouchami, W., Adkins, J. F., Echegoyen-Sanz, Y., Ellwood, M., Flegal, A. R., Fornace, K., Gallon, C., Galer, S., Gault-Ringold, M., Lacan, F., Radic, A., Rehkamper, M., Rouxel, O., Sohrin, Y., Stirling, C., Thompson, C., Vance, D., Xue, Z., and Zhao, Y.: GEOTRACES IC1 (BATS) contamination-prone trace element isotopes Cd, Fe, Pb, Zn, Cu, and Mo intercalibration, Limnol. Oceanogr.-Meth., 10, 653–665, https://doi.org/10.4319/lom.2012.10.653, 2012.
Bruch, W., Piazzola, J., Branger, H., van Eijk, A. M. J., Luneau, C., Bourras, D., and Tedeschi, G.: Sea-Spray-Generation Dependence on Wind and Wave Combinations: A Laboratory Study, Bound.-Lay. Meteorol., 180, 477–505, https://doi.org/10.1007/s10546-021-00636-y, 2021.
Brunskill, G. J.: New Guinea and its coastal seas, a testable model of wet tropical coastal processes: an introduction to Project TROPICS, Cont. Shelf Res., 24, 2273–2295, https://doi.org/10.1016/j.csr.2004.08.001, 2004.
Buck, C. S., Landing, W. M., and Resing, J.: Pacific Ocean aerosols: Deposition and solubility of iron, aluminum, and other trace elements, Mar. Chem., 157, 117–130, https://doi.org/10.1016/j.marchem.2013.09.005, 2013.
Buck, C. S., Aguilar-Islas, A., Marsay, C., Kadko, D., and Landing, W. M.: Trace element concentrations, elemental ratios, and enrichment factors observed in aerosol samples collected during the US GEOTRACES eastern Pacific Ocean transect (GP16), Chem. Geol., 511, 212–224, https://doi.org/10.1016/j.chemgeo.2019.01.002, 2019.
Canil, D. and Lacourse, T.: An estimate for the bulk composition of juvenile upper continental crust derived from glacial till in the North American Cordillera, Chem. Geol., 284, 229–239, https://doi.org/10.1016/j.chemgeo.2011.02.024, 2011.
Chapman, J. B., Weiss, D. J., Shan, Y., and Lemburger, M.: Iron isotope fractionation during leaching of granite and basalt by hydrochloric and oxalic acids, Geochim. Cosmochim. Ac., 73, 1312–1324, https://doi.org/10.1016/j.gca.2008.11.037, 2009.
Chen, T., Li, W., Guo, B., Liu, R., Li, G., Zhao, L., and Ji, J.: Reactive iron isotope signatures of the East Asian dust particles: Implications for iron cycling in the deep North Pacific, Chem. Geol., 531, 119342, https://doi.org/10.1016/j.chemgeo.2019.119342, 2020.
Conway, T. M. and John, S. G.: Quantification of dissolved iron sources to the North Atlantic Ocean, Nature, 511, 212–215, https://doi.org/10.1038/nature13482, 2014.
Conway, T. M., Wolff, E. W., Röthlisberger, R., Mulvaney, R., and Elderfield, H. E.: Constraints on soluble aerosol iron flux to the Southern Ocean at the Last Glacial Maximum, Nat. Commun., 6, 7850, https://doi.org/10.1038/ncomms8850, 2015.
Conway, T. M., John, S. G., and Lacan, F.: Intercomparison of dissolved iron isotope profiles from reoccupation of three GEOTRACES stations in the Atlantic Ocean, Mar. Chem., 183, 50–61, https://doi.org/10.1016/j.marchem.2016.04.007, 2016.
Conway, T. M., Hamilton, D. S., Shelley, R. U., Aguilar-Islas, A. M., Landing, W. M., Mahowald, N. M., and John, S. G.: Tracing and constraining anthropogenic aerosol iron fluxes to the North Atlantic Ocean using iron isotopes, Nat. Commun., 10, 2628, https://doi.org/10.1038/s41467-019-10457-w, 2019.
Craddock, P. R., Warren, J. M., and Dauphas, N.: Abyssal peridotites reveal the near-chondritic Fe isotopic composition of the Earth, Earth Planet. Sc. Lett., 365, 63–76, https://doi.org/10.1016/j.epsl.2013.01.011, 2013.
Dammshäuser, A.: Distribution and behavior of the lithogenic tracers aluminium and titanium in the upper water column of the Atlantic Ocean, Faculty of Mathematics and Natural Sciences Christian-Albrechts-Universität zu Kiel, https://nbn-resolving.org/urn:nbn:de:gbv:8-diss-81211 (last access: 16 November 2024), 2012.
Desboeufs, K.: Processus de dissolution des aérosols atmosphériques au sein des gouttes d'eau nuageuses, Université Paris-Diderot – Paris VII, https://theses.hal.science/tel-00005175 (last access: 18 November 2024), 2001.
Desboeufs, K., Formenti, P., Torres-Sánchez, R., Schepanski, K., Chaboureau, J.-P., Andersen, H., Cermak, J., Feuerstein, S., Laurent, B., Klopper, D., Namwoonde, A., Cazaunau, M., Chevaillier, S., Feron, A., Mirande-Bret, C., Triquet, S., and Piketh, S. J.: Fractional solubility of iron in mineral dust aerosols over coastal Namibia: a link to marine biogenic emissions?, Atmos. Chem. Phys., 24, 1525–1541, https://doi.org/10.5194/acp-24-1525-2024, 2024.
Duce, R. A. and Hoffman, G. L.: Atmospheric vanadium transport to the ocean, Atmos. Environ., 10, 989–996, https://doi.org/10.1016/0004-6981(76)90207-9, 1976.
Duce, R. A. and Tindale, N. W.: Atmospheric transport of iron and its deposition in the ocean, Limnol. Oceanogr., 36, 1715–1726, https://doi.org/10.4319/lo.1991.36.8.1715, 1991.
Elrod, V. A., Berelson, W. M., Coale, K. H., and Johnson, K. S.: The flux of iron from continental shelf sediments: A missing source for global budgets, Geophys. Res. Lett., 31, L12307, https://doi.org/10.1029/2004GL020216, 2004.
Ellwood, M. J., Hutchins, D. A., Lohan, M. C., Milne, A., Nasemann, P., Nodder, S. D., Sander, S. G., Strzepek, R., Wilhelm, S. W., and Boyd, P. W.: Iron stable isotopes track pelagic iron cycling during a subtropical phytoplankton bloom, P. Natl. Acad. Sci. USA, 112, E15–E20, https://doi.org/10.1073/pnas.1421576112, 2015.
Flament, P., Mattielli, N., Aimoz, L., Choël, M., Deboudt, K., Jong, J. de, Rimetz-Planchon, J., and Weis, D.: Iron isotopic fractionation in industrial emissions and urban aerosols, Chemosphere, 73, 1793–1798, https://doi.org/10.1016/j.chemosphere.2008.08.042, 2008.
Hamilton, D. S., Scanza, R. A., Feng, Y., Guinness, J., Kok, J. F., Li, L., Liu, X., Rathod, S. D., Wan, J. S., Wu, M., and Mahowald, N. M.: Improved methodologies for Earth system modelling of atmospheric soluble iron and observation comparisons using the Mechanism of Intermediate complexity for Modelling Iron (MIMI v1.0), Geosci. Model Dev., 12, 3835–3862, https://doi.org/10.5194/gmd-12-3835-2019, 2019.
Hao, Y., Guo, Z., Yang, Z., Fang, M., and Feng, J.: Seasonal variations and sources of various elements in the atmospheric aerosols in Qingdao, China, Atmos. Res., 85, 27–37, https://doi.org/10.1016/j.atmosres.2006.11.001, 2007.
Homoky, W. B., Conway, T. M., John, S. G., König, D., Deng, F., Tagliabue, A., and Mills, R. A.: Iron colloids dominate sedimentary supply to the ocean interior, P. Natl. Acad. Sci. USA, 118, e2016078118, https://doi.org/10.1073/pnas.2016078118, 2021.
Hu, Z. and Gao, S.: Upper crustal abundances of trace elements: A revision and update, Chem. Geol., 253, 205–221, https://doi.org/10.1016/j.chemgeo.2008.05.010, 2008.
Jickells, T., An, Z., Andersen, K., Baker, A., Bergametti, G., Brooks, N., Cao, J., Boyd, P., Duce, R., Hunter, K., Kawahata, H., Kubilay, N., Laroche, J., Liss, P., Mahowald, N., Prospero, J., Ridgwell, A., Tegen, I., and Torres, R.: Global Iron Connections Between Desert Dust, Ocean Biogeochemistry, and Climate, Science, 308, 67–71, https://doi.org/10.1126/science.1105959, 2005.
John, S. G., Mendez, J., Moffett, J., and Adkins, J.: The flux of iron and iron isotopes from San Pedro Basin sediments, Geochim. Cosmochim. Ac., 93, 14–29, https://doi.org/10.1016/j.gca.2012.06.003, 2012.
Kiczka, M., Wiederhold, J. G., Frommer, J., Kraemer, S. M., Bourdon, B., and Kretzschmar, R.: Iron isotope fractionation during proton- and ligand-promoted dissolution of primary phyllosilicates, Geochim. Cosmochim. Ac., 74, 3112–3128, https://doi.org/10.1016/j.gca.2010.02.018, 2010.
Klar, J. K., Schlosser, C., Milton, J. A., Woodward, E. M. S., Lacan, F., Parkinson, I. J., Achterberg, E. P., and James, R. H.: Sources of dissolved iron to oxygen minimum zone waters on the Senegalese continental margin in the tropical North Atlantic Ocean: Insights from iron isotopes, Geochim. Cosmochim. Ac., 236, 60–78, https://doi.org/10.1016/j.gca.2018.02.031, 2018.
Kommalapati, R. R. and Valsaraj, K. T.: Atmospheric Aerosols and Their Importance, in: Atmospheric Aerosols, vol. 1005, American Chemical Society, 1–10, https://doi.org/10.1021/bk-2009-1005.ch001, 2009.
Kurisu, M. and Takahashi, Y.: Testing Iron Stable Isotope Ratios as a Signature of Biomass Burning, Atmosphere-Basel, 10, 76, https://doi.org/10.3390/atmos10020076, 2019.
Kurisu, M., Sakata, K., Miyamoto, C., Takaku, Y., Iizuka, T., and Takahashi, Y.: Variation of Iron Isotope Ratios in Anthropogenic Materials Emitted through Combustion Processes, Chem. Lett., 45, 970–972, https://doi.org/10.1246/cl.160451, 2016a.
Kurisu, M., Takahashi, Y., Iizuka, T., and Uematsu, M.: Very low isotope ratio of iron in fine aerosols related to its contribution to the surface ocean, J. Geophys. Res.-Atmos., 121, 11119–11136, https://doi.org/10.1002/2016JD024957, 2016b.
Kurisu, M., Sakata, K., Uematsu, M., Ito, A., and Takahashi, Y.: Contribution of combustion Fe in marine aerosols over the northwestern Pacific estimated by Fe stable isotope ratios, Atmos. Chem. Phys., 21, 16027–16050, https://doi.org/10.5194/acp-21-16027-2021, 2021.
Kurisu, M., Sakata, K., Nishioka, J., Obata, H., Conway, T. M., Hunt, H. R., Sieber, M., Suzuki, K., Kashiwabara, T., Kubo, S., Takada, M., and Takahashi, Y.: Source and fate of atmospheric iron supplied to the subarctic North Pacific traced by stable iron isotope ratios, Geochim. Cosmochim. Ac., 378, 168–185, https://doi.org/10.1016/j.gca.2024.06.009, 2024.
Labatut, M., Lacan, F., Pradoux, C., Chmeleff, J., Radic, A., Murray, J. W., Poitrasson, F., Johansen, A. M., and Thil, F.: Iron sources and dissolved-particulate interactions in the seawater of the Western Equatorial Pacific, iron isotope perspectives, Global Biogeochem. Cy., 28, 1044–1065, https://doi.org/10.1002/2014GB004928, 2014.
Lacan, F., Radic, A., Jeandel, C., Poitrasson, F., Sarthou, G., Pradoux, C., and Freydier, R.: Measurement of the isotopic composition of dissolved iron in the open ocean, Geophys. Res. Lett., 35, L24610, https://doi.org/10.1029/2008GL035841, 2008.
Lacan, F., Radic, A., Labatut, M., Jeandel, C., Poitrasson, F., Sarthou, G., Pradoux, C., Chmeleff, J., and Freydier, R.: High-Precision Determination of the Isotopic Composition of Dissolved Iron in Iron Depleted Seawater by Double Spike Multicollector-ICPMS, Anal. Chem., 82, 7103–7111, https://doi.org/10.1021/ac1002504, 2010.
Lacan, F., Artigue, L., Klar, J. K., Pradoux, C., Chmeleff, J., and Freydier, R.: Interferences and Matrix Effects on Iron Isotopic Composition Measurements by 57Fe–58Fe Double-Spike Multi-Collector Inductively Coupled Plasma Mass Spectrometry; the Importance of Calcium and Aluminum Interferences, Front. Environ. Chem., 2, 692025, https://doi.org/10.3389/fenvc.2021.692025, 2021.
Lacan, F., Pradoux, C., Dutrieux, P., Murray, J. W., Johansen, A., Radic, A., and Labatut, M.: CTD, dissolved oxygen concentrations, iron concentrations and isotopic compositions in the filtered seawater, seawater suspended particles and aerosols, during the EUCFe cruise, KM0625, in the Equatorial Pacific Ocean, SEANOE [data set], https://doi.org/10.17882/107774, 2025.
Landing, W. M. and Shelley, R.: Total aerosol trace metal concentrations from R/V Knorr cruises KN199-04 and KN204-01 in the Subtropical northern Atlantic Ocean from 2010–2011, U.S. GEOTRACES NAT project [data set], Version 16 September 2014, http://lod.bco-dmo.org/id/dataset/3865 (last access: 30 November 2024), 2014.
Landing, W. M., Measures, C. I., and Resing, J. A.: Collaborative Research: Global Ocean Survey of Dissolved Iron and Aluminum and Aerosol Iron and Aluminum Solubility Supporting the Repeat Hydrography (CO2 Project (CLIVAR AEROSOL) [data set], Version 12 June 2013, https://www.bco-dmo.org/dataset-deployment/454424 (last access: 30 November 2024), 2013.
Lelieveld, J. and Crutzen, P. J.: The role of clouds in tropospheric photochemistry, J. Atmos. Chem., 12, 229–267, https://doi.org/10.1007/BF00048075, 1991.
Li, R., Zhang, H., Wang, F., He, Y., Huang, C., Luo, L., Dong, S., Jia, X., and Tang, M.: Mass fractions, solubility, speciation and isotopic compositions of iron in coal and municipal waste fly ash, Sci. Total Environ., 838, 155974, https://doi.org/10.1016/j.scitotenv.2022.155974, 2022.
Madawala, C. K., Molina, C., Kim, D., Gamage, D. K., Sun, M., Leibensperger, R. J. I., Mehndiratta, L., Lee, J., Kaluarachchi, C. P., Kimble, K. A., Sandstrom, G., Harb, C., Dinasquet, J., Malfatti, F., Prather, K. A., Deane, G. B., Stokes, M. D., Lee, C., Slade, J. H., Stone, E. A., Grassian, V. H., and Tivanski, A. V.: Effects of Wind Speed on Size-Dependent Morphology and Composition of Sea Spray Aerosols, ACS Earth Space Chem., 8, 1609–1622, https://doi.org/10.1021/acsearthspacechem.4c00119, 2024.
Majestic, B. J., Anbar, A. D., and Herckes, P.: Elemental and iron isotopic composition of aerosols collected in a parking structure, Sci. Total Environ., 407, 5104–5109, https://doi.org/10.1016/j.scitotenv.2009.05.053, 2009.
Marsay, C. M., Kadko, D., Landing, W. M., and Buck, C. S.: Bulk Aerosol Trace Element Concentrations and Deposition Fluxes During the U.S. GEOTRACES GP15 Pacific Meridional Transect, Global Biogeochem. Cy., 36, e2021GB007122, https://doi.org/10.1029/2021GB007122, 2022.
Martin, J. H.: Iron as a Limiting Factor in Oceanic Productivity, in: Primary Productivity and Biogeochemical Cycles in the Sea, edited by: Falkowski, P. G., Woodhead, A. D., and Vivirito, K., Springer, Boston, MA, 123–137, https://doi.org/10.1007/978-1-4899-0762-2_8, 1992.
Maters, E. C., Mulholland, D. S., Flament, P., de Jong, J., Mattielli, N., Deboudt, K., Dhont, G., and Bychkov, E.: Laboratory study of iron isotope fractionation during dissolution of mineral dust and industrial ash in simulated cloud water, Chemosphere, 299, 134472, https://doi.org/10.1016/j.chemosphere.2022.134472, 2022.
Mead, C., Herckes, P., Majestic, B. J., and Anbar, A. D.: Source apportionment of aerosol iron in the marine environment using iron isotope analysis, Geophys. Res. Lett., 40, 5722–5727, https://doi.org/10.1002/2013GL057713, 2013.
Moore, J. K. and Braucher, O.: Sedimentary and mineral dust sources of dissolved iron to the world ocean, Biogeosciences, 5, 631–656, https://doi.org/10.5194/bg-5-631-2008, 2008.
Morel, F. M. M., Lam, P. J., and Saito, M. A.: Trace Metal Substitution in Marine Phytoplankton, Annu. Rev. Earth Pl. Sc., 48, 491–517, https://doi.org/10.1146/annurev-earth-053018-060108, 2020.
Mulholland, D. S., Flament, P., de Jong, J., Mattielli, N., Deboudt, K., Dhont, G., and Bychkov, E.: In-cloud processing as a possible source of isotopically light iron from anthropogenic aerosols: New insights from a laboratory study, Atmos. Environ., 259, 118505, https://doi.org/10.1016/j.atmosenv.2021.118505, 2021.
Neall, V. E. and Trewick, S. A.: The age and origin of the Pacific islands: a geological overview, Philos. T. R. Soc. B, 363, 3293–3308, https://doi.org/10.1098/rstb.2008.0119, 2008.
Nozaki, Y.: A fresh look at element distribution in the North Pacific Ocean, Eos, Transactions American Geophysical Union, 78, 221–221, https://doi.org/10.1029/97EO00148, 1997.
Nusantara, L.: An outline of the geology of Indonesia, Ikatan Ahli Geologi Indonesia, ISBN 979-8126-04-1, 2000.
Poitrasson, F.: On the iron isotope homogeneity level of the continental crust, Chem. Geol., 235, 195–200, https://doi.org/10.1016/j.chemgeo.2006.06.010, 2006.
Poulton, S. W. and Raiswell, R.: The low-temperature geochemical cycle of iron: From continental fluxes to marine sediment deposition, Am. J. Sci., 302, 774–805, https://doi.org/10.2475/ajs.302.9.774, 2002.
Radic, A., Lacan, F., and Murray, J. W.: Iron isotopes in the seawater of the equatorial Pacific Ocean: New constraints for the oceanic iron cycle, Earth Planet. Sc. Lett., 306, 1–10, https://doi.org/10.1016/j.epsl.2011.03.015, 2011.
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, 7, https://doi.org/10.1186/1467-4866-9-7, 2008.
Ramos, V. A.: Anatomy and global context of the Andes: Main geologic features and the Andean orogenic cycle, in: Backbone of the Americas: Shallow Subduction, Plateau Uplift, and Ridge and Terrane Collision, edited by: Kay, S. M., Ramos, V. A., and Dickinson, W. R., Geological Society of America, https://doi.org/10.1130/2009.1204(02), 2009.
Resing, J. A., Sedwick, P. N., German, C. R., Jenkins, W. J., Moffett, J. W., Sohst, B. M., and Tagliabue, A.: Basin-scale transport of hydrothermal dissolved metals across the South Pacific Ocean, Nature, 523, 200–203, https://doi.org/10.1038/nature14577, 2015.
Rolph, G., Stein, A., and Stunder, B.: Real-time Environmental Applications and Display sYstem: READY, Environ. Modell. Softw., 95, 210–228, https://doi.org/10.1016/j.envsoft.2017.06.025, 2017.
Rudnick, R. L. and Gao, S.: 4.1 – Composition of the Continental Crust, in: Treatise on Geochemistry, 2nd edn., edited by: Holland, H. D. and Turekian, K. K., Elsevier, Oxford, 51 pp., https://doi.org/10.1016/B978-0-08-095975-7.00301-6, 2014.
Sakata, K., Kurisu, M., Takeichi, Y., Sakaguchi, A., Tanimoto, H., Tamenori, Y., Matsuki, A., and Takahashi, Y.: Iron (Fe) speciation in size-fractionated aerosol particles in the Pacific Ocean: The role of organic complexation of Fe with humic-like substances in controlling Fe solubility, Atmos. Chem. Phys., 22, 9461–9482, https://doi.org/10.5194/acp-22-9461-2022, 2022.
Seinfeld, J. H. and Pandis, S. N.: Atmospheric Chemistry and Physics: From Air Pollution to Climate Change, John Wiley and Sons, ISBN 978-1-118-94740-1, 2006.
Shah, V., Jacob, D. J., Moch, J. M., Wang, X., and Zhai, S.: Global modeling of cloud water acidity, precipitation acidity, and acid inputs to ecosystems, Atmos. Chem. Phys., 20, 12223–12245, https://doi.org/10.5194/acp-20-12223-2020, 2020.
Shelley, R. U., Roca-Martí, M., Castrillejo, M., Sanial, V., Masqué, P., Landing, W. M., van Beek, P., Planquette, H., and Sarthou, G.: Quantification of trace element atmospheric deposition fluxes to the Atlantic Ocean (> 40° N; GEOVIDE, GEOTRACES GA01) during spring 2014, Deep-Sea Res. Pt. I, 119, 34–49, https://doi.org/10.1016/j.dsr.2016.11.010, 2017.
Shelley, R. U., Landing, W. M., Ussher, S. J., Planquette, H., and Sarthou, G.: Regional trends in the fractional solubility of Fe and other metals from North Atlantic aerosols (GEOTRACES cruises GA01 and GA03) following a two-stage leach, Biogeosciences, 15, 2271–2288, https://doi.org/10.5194/bg-15-2271-2018, 2018.
Sholkovitz, E. R., Sedwick, P. N., Church, T. M., Baker, A. R., and Powell, C. F.: Fractional solubility of aerosol iron: Synthesis of a global-scale data set, Geochim. Cosmochim. Ac., 89, 173–189, https://doi.org/10.1016/j.gca.2012.04.022, 2012.
Slemons, L., Gorgues, T., Aumont, O., Menkes, C., and Murray, J. W.: Biogeochemical impact of a model western iron source in the Pacific Equatorial Undercurrent, Deep-Sea Res. Pt. I, 56, 2115–2128, https://doi.org/10.1016/j.dsr.2009.08.005, 2009.
Slemons, L., Murray, J. W., Resing, J., Paul, B., and Dutrieux, P.: Western Pacific coastal sources of iron, manganese, and aluminum to the Equatorial Undercurrent, Global Biogeochem. Cy., 24, GB3024, https://doi.org/10.1029/2009GB003693, 2010.
Slemons, L., Paul, B., Resing, J., and Murray, J. W.: Particulate iron, aluminum, and manganese in the Pacific equatorial undercurrent and low latitude western boundary current sources, Mar. Chem., 142–144, 54–67, https://doi.org/10.1016/j.marchem.2012.08.003, 2012.
Stein, A. F., Draxler, R. R., Rolph, G. D., Stunder, B. J. B., Cohen, M. D., and Ngan, F.: NOAA's HYSPLIT Atmospheric Transport and Dispersion Modeling System, B. Am. Meteorol. Soc., 96, 2059–2077, https://doi.org/10.1175/BAMS-D-14-00110.1, 2015.
Tagliabue, A., Bopp, L., Dutay, J.-C., Bowie, A. R., Chever, F., Jean-Baptiste, P., Bucciarelli, E., Lannuzel, D., Remenyi, T., Sarthou, G., Aumont, O., Gehlen, M., and Jeandel, C.: Hydrothermal contribution to the oceanic dissolved iron inventory, Nat. Geosci., 3, 252–256, https://doi.org/10.1038/ngeo818, 2010.
Teng, F.-Z., Dauphas, N., Huang, S., and Marty, B.: Iron isotopic systematics of oceanic basalts, Geochim. Cosmochim. Ac., 107, 12–26, https://doi.org/10.1016/j.gca.2012.12.027, 2013.
Turekian, K. K. and Wedepohl, K. H.: Distribution of the Elements in Some Major Units of the Earth's Crust, GSA Bulletin, 72, 175–192, https://doi.org/10.1130/0016-7606(1961)72[175:DOTEIS]2.0.CO;2, 1961.
Waeles, M., Baker, A. R., Jickells, T., and Hoogewerff, J.: Global dust teleconnections: aerosol iron solubility and stable isotope composition, Environ. Chem., 4, 233, https://doi.org/10.1071/EN07013, 2007.
Wang, Y., Wu, L., Hu, W., Li, W., Shi, Z., Harrison, R. M., and Fu, P.: Stable iron isotopic composition of atmospheric aerosols: An overview, NPJ
Wei, T., Dong, Z., Zong, C., Liu, X., Kang, S., Yan, Y., and Ren, J.: Global-scale constraints on the origins of aerosol iron using stable iron isotopes: A review, Earth-Sci. Rev., 258, 104943, https://doi.org/10.1016/j.earscirev.2024.104943, 2024.
Whitby, K. T.: The physical characteristics of sulfur aerosols, Atmos. Environ., 12, 135–159, https://doi.org/10.1016/0004-6981(78)90196-8, 1978.
Wiederhold, J. G., Kraemer, S. M., Teutsch, N., Borer, P. M., Halliday, A. N., and Kretzschmar, R.: Iron Isotope Fractionation during Proton-Promoted, Ligand-Controlled, and Reductive Dissolution of Goethite, Environ. Sci. Technol., 40, 3787–3793, https://doi.org/10.1021/es052228y, 2006.
Wunderman, R.: Report on Rabaul (Papua New Guinea), Bulletin of the Global Volcanism Network, 31, 9, https://doi.org/10.5479/si.GVP.BGVN200609-252140, 2006.
Yeghicheyan, D., Bossy, C., Bouhnik Le Coz, M., Douchet, C., Granier, G., Heimburger, A., Lacan, F., Lanzanova, A., Rousseau, T. C. C., Seidel, J.-L., Tharaud, M., Candaudap, F., Chmeleff, J., Cloquet, C., Delpoux, S., Labatut, M., Losno, R., Pradoux, C., Sivry, Y., and Sonke, J. E.: A Compilation of Silicon, Rare Earth Element and Twenty-One other Trace Element Concentrations in the Natural River Water Reference Material SLRS-5 (NRC-CNRC), Geostand. Geoanal. Res., 37, 449–467, https://doi.org/10.1111/j.1751-908X.2013.00232.x, 2013.
Yeghicheyan, D., Aubert, D., Bouhnik-Le Coz, M., Chmeleff, J., Delpoux, S., Djouraev, I., Granier, G., Lacan, F., Piro, J.-L., Rousseau, T., Cloquet, C., Marquet, A., Menniti, C., Pradoux, C., Freydier, R., Vieira da Silva-Filho, E., and Suchorski, K.: A New Interlaboratory Characterisation of Silicon, Rare Earth Elements and Twenty-Two Other Trace Element Concentrations in the Natural River Water Certified Reference Material SLRS-6 (NRC-CNRC), Geostand. Geoanal. Res., 43, 475–496, https://doi.org/10.1111/ggr.12268, 2019.
Zhai, J., Burke, I. T., Mayes, W. M., and Stewart, D. I.: New insights into biomass combustion ash categorisation: A phylogenetic analysis, Fuel, 287, 119469, https://doi.org/10.1016/j.fuel.2020.119469, 2021.
Zoller, W. H., Gladney, E. S., and Duce, R. A.: Atmospheric Concentrations and Sources of Trace Metals at the South Pole, Science, 183, 198–200, https://doi.org/10.1126/science.183.4121.198, 1974.
Short summary
This paper presents the chemical and iron isotopic composition of aerosols (> 1 µm) over the equatorial and tropical Pacific Ocean in previously undocumented areas. Analysis of our data suggests that a significant proportion of aerosol iron (∼ 13 %) is not only dissolved but also removed during atmospheric transport. Such removal had not previously been evidenced to our knowledge. This highlights the unique and strong constraints brought by iron isotopes on atmospheric process studies.
This paper presents the chemical and iron isotopic composition of aerosols (> 1 µm) over the...
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