Bioactive trace metals and their isotopes as paleoproductivity proxies: An assessment using GEOTRACES-era data

Abstract

1. What is the modern marine distribution of this TEI system? 104 2. Which biological, chemical, and physical processes are most important for maintaining this 105 distribution? 106 3. In what form is this TEI system incorporated into sediments? 107 4. Are there clear priorities for improving the utility of this system to track paleoproductivity? 108 This structure results in some repetition of the main distributions, drivers, and sedimentary archives 109 between individual TEI systems. This redundancy is deliberate: each section can be read independently 110 without reference to other TEIs. We close our review by assessing the 'maturity' of each system based on 111 a comparison to more established productivity proxies, offer suggestions for future studies, and discuss 112 prospects for paleoproductivity reconstructions using bioactive TEI isotope systems.