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Title: Boundary exchange completes the marine Pb cycle jigsaw
Authors: Chen, Mengli
Carrasco, Gonzalo
Zhao, Ning
Wang, Xianfeng
Lee, Jen Nie
Tanzil, Jani T. I.
Annammala, Kogila Vani
Poh, Seng Chee
Lauro, Federico M.
Ziegler, Alan D.
Duangnamon, Decha
Boyle, Edward A.
Keywords: Science::Geology
Engineering::Environmental engineering
Issue Date: 2023
Source: Chen, M., Carrasco, G., Zhao, N., Wang, X., Lee, J. N., Tanzil, J. T. I., Annammala, K. V., Poh, S. C., Lauro, F. M., Ziegler, A. D., Duangnamon, D. & Boyle, E. A. (2023). Boundary exchange completes the marine Pb cycle jigsaw. Proceedings of the National Academy of Sciences of the United States of America, 120(6), e2213163120-.
Project: NRF2021-ITS007-0003 
Tier1 RT 06/19 
Journal: Proceedings of the National Academy of Sciences of the United States of America 
Abstract: Material fluxes at the land-ocean interface impact seawater composition and global cycling of elements. However, most attention has been focused on the fluvial dissolved fluxes. For elements like lead (Pb), whose fluvial particulate flux into the ocean is two orders of magnitude higher than the dissolved counterpart, the role of particulates in elemental cycling is potentially important but currently less appreciated. Using both chemical analyses on samples collected from around equatorial Southeast Asia and model simulations, we show that particulate-dissolved exchange is an important mechanism controlling the concentration and isotopic composition of dissolved Pb in the ocean. Our model indicates that Pb contributed from particulate-dissolved exchange at ocean boundaries is larger than, or at least comparable to, other major Pb sources to the seawater before the Anthropocene, when the anthropogenic Pb was absent. Our work highlights the importance of boundary exchange in understanding marine element cycling and weathering-climate feedback.
ISSN: 0027-8424
DOI: 10.1073/pnas.2213163120
Schools: Asian School of the Environment 
Research Centres: Earth Observatory of Singapore 
Singapore Centre for Environmental Life Sciences and Engineering (SCELSE) 
Rights: © 2023 the Author(s). Published by PNAS. This article is distributed under Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:ASE Journal Articles

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