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dc.contributor.authorHayes, Christopher T.  Concept link
dc.contributor.authorBlack, Erin E.  Concept link
dc.contributor.authorAnderson, Robert F.  Concept link
dc.contributor.authorBaskaran, Mark  Concept link
dc.contributor.authorBuesseler, Ken O.  Concept link
dc.contributor.authorCharette, Matthew A.  Concept link
dc.contributor.authorCheng, Hai  Concept link
dc.contributor.authorCochran, J. Kirk  Concept link
dc.contributor.authorEdwards, R. Lawrence  Concept link
dc.contributor.authorFitzgerald, Patrick  Concept link
dc.contributor.authorLam, Phoebe J.  Concept link
dc.contributor.authorLu, Yanbin  Concept link
dc.contributor.authorMorris, Stephanie O.  Concept link
dc.contributor.authorOhnemus, Daniel C.  Concept link
dc.contributor.authorPavia, Frank  Concept link
dc.contributor.authorStewart, Gillian  Concept link
dc.contributor.authorTang, Yi  Concept link
dc.date.accessioned2019-05-14T20:40:34Z
dc.date.available2019-05-22T07:36:43Z
dc.date.issued2018-11-22
dc.identifier.citationHayes, C. T., Black, E. E., Anderson, R. F., Baskaran, M., Buesseler, K. O., Charette, M. A., Cheng, H., Cochran, J. K., Edwards, R. L., Fitzgerald, P., Lam, P. J., Lu, Y., Morris, S. O., Ohnemus, D. C., Pavia, F. J., Stewart, G., & Tang, Y. (2018). Flux of particulate elements in the North Atlantic Ocean constrained by multiple radionuclides. Global Biogeochemical Cycles, 32(12), 1738-1758.en_US
dc.identifier.urihttps://hdl.handle.net/1912/24136
dc.descriptionAuthor Posting. © American Geophysical Union, 2019. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Global Biogeochemical Cycles 32(12), (2019): 1738-1758, doi:10.1029/2018GB005994.en_US
dc.description.abstractSinking particles strongly regulate the distribution of reactive chemical substances in the ocean, including particulate organic carbon and other elements (e.g., P, Cd, Mn, Cu, Co, Fe, Al, and 232Th). Yet, the sinking fluxes of trace elements have not been well described in the global ocean. The U.S. GEOTRACES campaign in the North Atlantic (GA03) offers the first data set in which the sinking flux of carbon and trace elements can be derived using four different radionuclide pairs (238U:234Th ;210Pb:210Po; 228Ra:228Th; and 234U:230Th) at stations co‐located with sediment trap fluxes for comparison. Particulate organic carbon, particulate P, and particulate Cd fluxes all decrease sharply with depth below the euphotic zone. Particulate Mn, Cu, and Co flux profiles display mixed behavior, some cases reflecting biotic remineralization, and other cases showing increased flux with depth. The latter may be related to either lateral input of lithogenic material or increased scavenging onto particles. Lastly, particulate Fe fluxes resemble fluxes of Al and 232Th, which all have increasing flux with depth, indicating a dominance of lithogenic flux at depth by resuspended sediment transported laterally to the study site. In comparing flux estimates derived using different isotope pairs, differences result from different timescales of integration and particle size fractionation effects. The range in flux estimates produced by different methods provides a robust constraint on the true removal fluxes, taking into consideration the independent uncertainties associated with each method. These estimates will be valuable targets for biogeochemical modeling and may also offer insight into particle sinking processes.en_US
dc.description.sponsorshipThis study grew out of a synthesis workshop at the Lamont‐Doherty Earth Observatory of Columbia University in August 2016. This workshop was sponsored by the U.S. GEOTRACES Project Office (NSF 1536294) and the Ocean Carbon and Biogeochemistry (OCP) Project Office (NSF 1558412 and NASA NNX17AB17G). The U.S. National Science Foundation supported all of the analytical work on GA03. Kuanbo Zhou measured 228Th in the large size class particles (NSF 0925158 to WHOI). NSF 1061128 to Stony Brook University supported the BaRFlux project, for which Chistina Heilbrun is acknowledged for laboratory and field work. The lead author acknowledges support from a start‐up grant from the University of Southern Mississippi. Two anonymous reviewers are thanked for their constructive comments. All GEOTRACES GA03 data used in this study are accessible through the Biological and Chemical Oceanography Data Management Office (http://data.bco‐dmo.org/jg/dir/BCO/GEOTRACES/NorthAtlanticTransect/), and derived parameters are reported in the supporting information.en_US
dc.publisherAmerican Geophysical Unionen_US
dc.relation.urihttps://doi.org/10.1029/2018GB005994
dc.subjectbiological carbon pumpen_US
dc.subjecttrace metalsen_US
dc.subjectNorth Atlanticen_US
dc.subjectexporten_US
dc.subjectGEOTRACESen_US
dc.titleFlux of particulate elements in the North Atlantic Ocean constrained by multiple radionuclidesen_US
dc.typeArticleen_US
dc.description.embargo2019-05-22en_US
dc.identifier.doi10.1029/2018GB005994


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