Data for Dissolved lead (Pb) and Pb isotope along the East China Sea and Kuroshio transect – evidence for isopycnal transport and particle exchange
Mengli Chen Edward A Boyle Shuo Jiang Qian Liu Jing Zhang Kuanbo Zhou
Edward A Boyle
Shuo Jiang
Qian Liu
Jing Zhang
Kuanbo Zhou
No Thumbnail Available
Date
2022-09-14
Type
Dataset
Description
<p class="MsoNormal" style="text-align: justify; text-justify: inter-ideograph; line-height: 150%;"><span lang="EN-SG" style="font-family: 'Times New Roman',serif;">Lead (Pb) isotopes are widely used in tracing processes that transport Pb</span><span style="font-family: 'Times New Roman',serif; mso-ansi-language: EN-US;"> within the environment due to the globally-spread Pb pollution</span><span lang="EN-SG" style="font-family: 'Times New Roman',serif;">. In today’s ocean, Pb is mainly sourced from anthropogenic emissions and is removed by particle scavenging. However, recent efforts involving Pb isotopes started to point that sediments at ocean boundary, either suspended or benthic, as a previously underestimated source and sink of Pb to the seawater dissolved pool. To assess the contributions of Pb from seawater-sediment boundary, we measured the dissolved Pb concentrations and isotopic compositions in seawater from the outer East China Sea (ECS) and along the Kuroshio. Along the Kuroshio, depth profiles exhibit highly similar Pb concentrations across constant density planes, suggesting isopycnal transport. Pb isotope ratios in most of the samples show strong contributions of aerosol Pb, except for seawaters from the East China Sea and deep Okinawa Trough (>800m), which show evidences of crustal Pb contribution. The Okinawa Trough deep water has overlapping Pb isotope ratios with East China Sea water, where the suspended particulate matter is abundant. Our data on Pb isotopes in the East China Sea and the Okinawa Trough deep water, together with data from previous studies at other continental margins suggest that the seawater-sediment boundary along the continental shelves may be an important source and sink in marine Pb cycling.</span></p>
Keywords
Lead, Seawater, lead isotope, Kuroshio, East China Sea
Citation
Mengli Chen, Edward A Boyle, Shuo Jiang, Qian Liu, Jing Zhang, Kuanbo Zhou (2022-09-14). Data for Dissolved lead (Pb) and Pb isotope along the East China Sea and Kuroshio transect – evidence for isopycnal transport and particle exchange. ScholarBank@NUS Repository. [Dataset].