| Autor: |
Chen M; Tropical Marine Science Institute, National University of Singapore 119227, Singapore., Carrasco G; Earth Observatory of Singapore, Nanyang Technological University, Singapore 639798, Singapore., Zhao N; State Key Laboratory of Estuarine and Coastal Research and Institute of Eco-Chongming, East China Normal University, Shanghai 200241, China., Wang X; Earth Observatory of Singapore, Nanyang Technological University, Singapore 639798, Singapore.; Asian School of the Environment, Nanyang Technological University, Singapore 639798, Singapore., Lee JN; Faculty of Science and Marine Environment, Universiti Malaysia Terengganu, Kuala Nerus 210030, Malaysia., Tanzil JTI; Tropical Marine Science Institute, National University of Singapore 119227, Singapore., Annammala KV; Centre of Environmental Sustainability and Water Security, Research Institute for Sustainable Environment, Universiti Teknologi Malaysia, 81310 Johor Bahru, Malaysia., Poh SC; Faculty of Science and Marine Environment, Universiti Malaysia Terengganu, Kuala Nerus 210030, Malaysia., Lauro FM; Asian School of the Environment, Nanyang Technological University, Singapore 639798, Singapore.; Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore 637551, Singapore., Ziegler AD; Faculty of Fisheries Technology and Aquatic Resources, Maejo University, Chiang Mai 50290, Thailand., Duangnamon D; Andaman Coastal Research Center for Development, Faculty of Fisheries, Kasetsart University, Ranong 85120, Thailand., Boyle EA; Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139. |
| Abstrakt: |
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. |
