Effects of oxygen penetration and iron redox shuttling on the preservation of reactive iron-bound organic carbon in a large-river-dominated estuary

Key Points

• Reactive iron-bound organic carbon preservation is influenced by oxygen penetration and iron redox shuttling.
• Data suggests that increased iron shuttling enhances carbon stability in large-river-dominated estuaries.
• Reduced oxygen levels result in enhanced retention of reactive iron-bound organic carbon over time.
• Understanding these dynamics may help predict carbon cycling effects in estuarine environments.