FN Archimer Export Format
PT J
TI Bioactive trace metals and their isotopes as paleoproductivity proxies: An assessment using GEOTRACES‐era data
BT 
AF Horner, T.J.
   Little, S.H.
   Conway, T.M.
   Farmer, J.R.
   Hertzberg, J.E.
   Janssen, D.J.
   Lough, A.J.M.
   McKay, J.
   Tessin, A.
   Galer, S.J.G.
   Jaccard, S.L.
   Lacan, F.
   Paytan, A.
   Wuttig, K.
   Members, GEOTRACES–PAGES Biological Producti
AS 1:1,2;2:3;3:4;4:5,6;5:7;6:8;7:9;8:10;9:11;10:6;11:8;12:12;13:13;14:14;15:;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;12:;13:;14:;15:;
C1 NIRVANA Labs
   Department of Marine Chemistry & Geochemistry Woods Hole Oceanographic Institution Woods Hole MA ,USA
   Department of Earth Sciences University College London London, GBR
   College of Marine Science University of South Florida FL, USA
   Department of Geosciences Princeton University Princeton NJ ,USA
   Max‐Planck Institute for Chemistry Mainz ,DEU
   Department of Ocean Earth & Atmospheric Sciences Old Dominion University Norfolk VA ,USA
   Institute of Geological Sciences and Oeschger Center for Climate Change Research University of Bern Bern ,CHE
   University of Southampton National Oceanography Centre Southampton ,GBR
   College of Earth, Ocean, and Atmospheric Sciences Oregon State University Corvallis OR, USA
   Department of Geology Kent State University Kent OH ,USA
   LEGOS University of Toulouse CNRS CNES, IRD, UPS Toulouse ,FRA
   Institute of Marine Sciences University of California Santa Cruz Santa Cruz CA ,USA
   Antarctic Climate and Ecosystems Cooperative Research Centre University of Tasmania Hobart ,AUS
C2 NIRVANA LABS, USA
   WHOI, USA
   UNIV COLL LONDON, UK
   UNIV SOUTH FLORIDA, USA
   UNIV PRINCETON, USA
   MAX PLANCK INST CHEM, DENMARK
   UNIV OLD DOMINION, USA
   UNIV BERN, SWITZERLAND
   UNIV SOUTHAMPTON, UK
   UNIV OREGON STATE, USA
   UNIV KENT, USA
   UNIV TOULOUSE, FRANCE
   UNIV CALIF SANTA CRUZ, USA
   UNIV TASMANIA, AUSTRALIA
UM LEMAR
IN WOS Cotutelle UMR
   copubli-france
   copubli-europe
   copubli-univ-france
   copubli-int-hors-europe
IF 6.5
TC 31
UR https://archimer.ifremer.fr/doc/00702/81406/85779.pdf
   https://archimer.ifremer.fr/doc/00702/81406/85780.pdf
LA English
DT Article
DE ;biological pump;marine chemistry;biogeochemical cycles;micronutrients;phytoplankton;paleoceanography
AB Phytoplankton productivity and export sequester climatically significant quantities of atmospheric carbon dioxide as particulate organic carbon through a suite of processes termed the biological pump. How the biological pump operated in the past is therefore important for understanding past atmospheric carbon dioxide concentrations and Earth’s climate history. However, reconstructing the history of the biological pump requires proxies. Due to their intimate association with biological processes, several bioactive trace metals and their isotopes are potential proxies for past phytoplankton productivity, including: iron, zinc, copper, cadmium, molybdenum, barium, nickel, chromium, and silver. Here we review the oceanic distributions, driving processes, and depositional archives for these nine metals and their isotopes based on GEOTRACES-era datasets. We offer an assessment of the overall maturity of each isotope system to serve as a proxy for diagnosing aspects of past ocean productivity and identify priorities for future research. This assessment reveals that cadmium, barium, nickel, and chromium isotopes offer the most promise as tracers of paleoproductivity, whereas iron, zinc, copper, and molybdenum do not. Too little is known about silver to make a confident determination. Intriguingly, the elements that are least sensitive to productivity may be used to trace other aspects of ocean chemistry, such as nutrient sources, particle scavenging, organic complexation, and ocean redox state. These complementary sensitivities suggest new opportunities for combining perspectives from multiple proxies that will ultimately enable painting a more complete picture of marine paleoproductivity, biogeochemical cycles, and Earth’s climate history. 
PY 2021
PD NOV
SO Global Biogeochemical Cycles
SN 0886-6236
PU American Geophysical Union (AGU)
VL 35
IS 11
UT 000723020500005
DI 10.1029/2020GB006814
ID 81406
ER

EF