Biogenic-to-lithogenic handoff of particulate Zn affects the Zn cycle in the Southern Ocean
- Princeton Univ., NJ (United States)
- Univ. of Stellenbosch (South Africa)
- Univ. of Chicago, IL (United States)
- Max Planck Society, Mainz (Germany). Max Planck Inst. for Chemistry
- Univ. of California, Santa Cruz, CA (United States)
Zinc (Zn) is vital to marine organisms. Its active uptake by phytoplankton results in a substantial depletion of dissolved Zn, and Zn bound to particulate organic matter replenishes dissolved Zn in the ocean through remineralization. However, we found that particulate Zn changes from Zn bound to phosphoryls in cells to recalcitrant inorganic pools that include biogenic silica, clays, and iron, manganese, and aluminum oxides in the Southern Ocean water column. The abundances of inorganic pools increase with depth and are the only phases preserved in sediments. Changes in the particulate-Zn speciation influence Zn bioavailability and explain the decoupling of Zn and phosphorus and the correlation of Zn and silicon in the water column. Here, these findings reveal a new dimension to the ocean Zn cycle, implicating an underappreciated role of inorganic Zn particles and their impact on biological productivity.
- Research Organization:
- Univ. of Chicago, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
- Grant/Contract Number:
- AC02-06CH11357; SC0012704; SC0021222
- OSTI ID:
- 3013003
- Alternate ID(s):
- OSTI ID: 2540562
- Journal Information:
- Science, Journal Name: Science Journal Issue: 6701 Vol. 384; ISSN 1095-9203; ISSN 0036-8075
- Publisher:
- AAASCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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