Remineralization of upper ocean particles: Implications for iron biogeochemistry

• DOI: 10.4319/lo.2010.55.3.1271
• Publication Date: 2010-04-09T03:32:55Z
• Authors: P. W. Boyd; E. Ibisanmi; S. G. Sander; K. A. Hunter; G. A. Jackson
• Keywords: Biogeochemical Cycle; Biogeochemistry; Scavenging; Settling

The role of heterotrophic bacteria in iron recycling, the influence complexation on remineralization, and mobilization rates from lithogenic vs. biogenic particulate (PFe) were examined using field experiments modeling simulations. During summer, we measured rate algal by mixed layer at a polar subpolar site south Australia, conducted shipboard incubations to track release dissolved (DFe) iron‐binding ligands subsurface settling particles sampled 120‐m depth. Bacteria mobilized > 25% PFe d −1 surface waters relative depth (< 2% ). Our provide first evidence concurrent weak DFe sinking particles. Simulated profiles based proxies, point greater dissolution than PFe. Together our findings different biogeochemical functions for PFe: is probably main source both ligands, whereas may contribute most scavenging ballasting proportions flux vary regionally set contribution ligand release, hence fate water column.