Publication Abstracts

Costa et al. 2020

Costa, K.M., C.T. Hayes, R.F. Anderson, F.J. Pavia, A. Bausch, F. Deng, J.-C. Dutay, W. Geibert, C. Heinze, G. Henderson, C. Hillaire-Marcel, S. Hoffmann, S.L. Jaccard, A.W. Jacobel, S.S. Kienast, L. Kipp, P. Lerner, J. Lippold, D. Lund, F. Marcantonio, D. McGee, J.F. McManus, F. Mekik, J.L. Middleton, L. Missiaen, C. Not, S. Pichat, L.F. Robinson, G.H. Rowland, M. Roy-Barman, A. Tagliabue, A. Torfstein, G. Winckler, and Y. Zhou, 2020: 230Th normalization: New insights on an essential tool for quantifying sedimentary fluxes in the Modern and Quaternary Ocean. Paleoceanogr. Paleoclimatol., 35, no. 2, e2019PA003820, doi:10.1029/2019PA003820.

230Th normalization is a valuable paleoceanographic tool for reconstructing high-resolution sediment fluxes during the late Pleistocene (last ∼500,000 years). As its application has expanded to ever more diverse marine environments, the nuances of 230Th systematics, with regard to particle type, particle size, lateral advective/diffusive redistribution, and other processes, have emerged. We synthesized over 1000 sedimentary records of 230Th from across the global ocean at two time slices, the late Holocene (0-5,000 years ago, or 0-5 ka) and the Last Glacial Maximum (18.5-23.5 ka), and investigated the spatial structure of 230Th-normalized mass fluxes. On a global scale, sedimentary mass fluxes were significantly higher during the Last Glacial Maximum (1.79±2.17 g/cm2kyr, 95% confidence) relative to the Holocene (1.48-1.68 g/cm2kyr, 95% confidence). We then examined the potential confounding influences of boundary scavenging, nepheloid layers, hydrothermal scavenging, size-dependent sediment fractionation, and carbonate dissolution on the efficacy of 230Th as a constant flux proxy. Anomalous 230Th behavior is sometimes observed proximal to hydrothermal ridges and in continental margins where high particle fluxes and steep continental slopes can lead to the combined effects of boundary scavenging and nepheloid interference. Notwithstanding these limitations, we found that 230Th normalization is a robust tool for determining sediment mass accumulation rates in the majority of pelagic marine settings (>1,000 m water depth).

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BibTeX Citation

  author={Costa, K. M. and Hayes, C. T. and Anderson, R. F. and Pavia, F. J. and Bausch, A. and Deng, F. and Dutay, J.-C. and Geibert, W. and Heinze, C. and Henderson, G. and Hillaire-Marcel, C. and Hoffmann, S. and Jaccard, S. L. and Jacobel, A. W. and Kienast, S. S. and Kipp, L. and Lerner, P. and Lippold, J. and Lund, D. and Marcantonio, F. and McGee, D. and McManus, J. F. and Mekik, F. and Middleton, J. L. and Missiaen, L. and Not, C. and Pichat, S. and Robinson, L. F. and Rowland, G. H. and Roy-Barman, M. and Tagliabue, A. and Torfstein, A. and Winckler, G. and Zhou, Y.},
  title={230Th normalization: New insights on an essential tool for quantifying sedimentary fluxes in the Modern and Quaternary Ocean},
  journal={Paleoceanogr. Paleoclimatol.},

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RIS Citation

ID  - co06110m
AU  - Costa, K. M.
AU  - Hayes, C. T.
AU  - Anderson, R. F.
AU  - Pavia, F. J.
AU  - Bausch, A.
AU  - Deng, F.
AU  - Dutay, J.-C.
AU  - Geibert, W.
AU  - Heinze, C.
AU  - Henderson, G.
AU  - Hillaire-Marcel, C.
AU  - Hoffmann, S.
AU  - Jaccard, S. L.
AU  - Jacobel, A. W.
AU  - Kienast, S. S.
AU  - Kipp, L.
AU  - Lerner, P.
AU  - Lippold, J.
AU  - Lund, D.
AU  - Marcantonio, F.
AU  - McGee, D.
AU  - McManus, J. F.
AU  - Mekik, F.
AU  - Middleton, J. L.
AU  - Missiaen, L.
AU  - Not, C.
AU  - Pichat, S.
AU  - Robinson, L. F.
AU  - Rowland, G. H.
AU  - Roy-Barman, M.
AU  - Tagliabue, A.
AU  - Torfstein, A.
AU  - Winckler, G.
AU  - Zhou, Y.
PY  - 2020
TI  - 230Th normalization: New insights on an essential tool for quantifying sedimentary fluxes in the Modern and Quaternary Ocean
JA  - Paleoceanogr. Paleoclimatol.
VL  - 35
IS  - 2
SP  - e2019PA003820
DO  - 10.1029/2019PA003820
ER  -

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