Boundary exchange completes the marine Pb cycle jigsaw
Name
pnas.2213163120.pdf
Description
Published version
Size
1.39 MB
Format
Adobe PDF
Checksum (MD5)
422d709801a0213c86d746b320e92714
Author(s)
Chen, Mengli
Carrasco, Gonzalo
Zhao, Ning
Wang, Xianfeng
Lee, Jen Nie
Tanzil, Jani TI
Annammala, Kogila Vani
Poh, Seng Chee
Lauro, Federico M
Ziegler, Alan D
Date Issued
February 7, 2023
Journal
Proceedings of the National Academy of Sciences
Publisher
Proceedings of the National Academy of Sciences
Citation
Chen, Mengli, Carrasco, Gonzalo, Zhao, Ning, Wang, Xianfeng, Lee, Jen Nie et al. 2023. "Boundary exchange completes the marine Pb cycle jigsaw." Proceedings of the National Academy of Sciences, 120 (6).
Version
Final published version
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.
MIT Department
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1073/pnas.2213163120
