Trace element and isotope deposition across the air-sea interface: progress and research needs

• Published in: Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
• Main Authors: Baker, A. R., Landing, W. M., Bucciarelli, Eva, Cheize, Marie, Fietz, S., Hayes, C. T., Kadko, D., Morton, P. L., Rogan, N., Sarthou, Géraldine, Shelley, Rachel U., Shi, Z., Shiller, A., Hulten, M. M. P.
• Other Authors: Centre for Ocean and Atmospheric Sciences Norwich (COAS), School of Environmental Sciences Norwich, University of East Anglia Norwich (UEA)-University of East Anglia Norwich (UEA), Department of Earth, Ocean and Atmospheric Science Tallahassee (FSU, Florida State University Tallahassee (FSU), Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Université de Brest (UBO), Department of Earth Sciences Stellenbosch, Stellenbosch University, University of Southern Mississippi (USM), Florida International University Miami (FIU), Helmholtz Centre for Ocean Research Kiel (GEOMAR), School of Geography, Earth and Environmental Sciences Birmingham, University of Birmingham Birmingham, Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2016
• Subjects: north-atlantic ocean; metal concentrations; mineral dust; ACL; air-sea exchange; anthropogenic aerosols; atmospheric chemistry; atmospheric deposition; biogeochemical impacts; chibido; dissolved aluminum; dust deposition; iron solubility; west atlantic; trace element solubility; soluble organic-matter; sediment resuspension; [SDE.BE]Environmental Sciences/Biodiversity and Ecology; [SDU.OCEAN]Sciences of the Universe [physics]/Ocean; Atmosphere; North Atlantic
• Online Access: https://hal.archives-ouvertes.fr/hal-01483209; https://hal.archives-ouvertes.fr/hal-01483209/document; https://hal.archives-ouvertes.fr/hal-01483209/file/rsta.2016.0190.pdf; https://doi.org/10.1098/rsta.2016.0190

WOS:000391139900018 International audience The importance of the atmospheric deposition of biologically essential trace elements, especially iron, is widely recognized, as are the difficulties of accurately quantifying the rates of trace element wet and dry deposition and their fractional solubility. This paper summarizes some of the recent progress in this field, particularly that driven by the GEOTRACES, and other, international research programmes. The utility and limitations of models used to estimate atmospheric deposition flux, for example, from the surface ocean distribution of tracers such as dissolved aluminium, are discussed and a relatively new technique for quantifying atmospheric deposition using the short-lived radionuclide beryllium-7 is highlighted. It is proposed that this field will advance more rapidly by using a multi-tracer approach, and that aerosol deposition models should be ground-truthed against observed aerosol concentration data. It is also important to improve our understanding of the mechanisms and rates that control the fractional solubility of these tracers. Aerosol provenance and chemistry (humidity, acidity and organic ligand characteristics) play important roles in governing tracer solubility. Many of these factors are likely to be influenced by changes in atmospheric composition in the future. Intercalibration exercises for aerosol chemistry and fractional solubility are an essential component of the GEOTRACES programme. This article is part of the themed issue 'Biological and climatic impacts of ocean trace element chemistry'.