High-precision measurements of N2 in benthic chambers indicate denitrification occurs across Port Phillip Bay's major sedimentary facies. The dataset, sourced from the Australian Ocean Data Network, shows denitrifying efficiencies of 75-85% at moderate organic carbon loadings, with most nitrogen returned as biologically unavailable N2. At high organic carbon loadings (>100 mmol m-2 day-1), denitrification rates drop near zero, returning nitrogen as ammonium.
Use Cases
- Modeling nitrogen budgets for coastal ecosystems based on measured biogenic N2, ammonia, nitrate, and nitrite fluxes.
- Assessing the impact of organic carbon loading on denitrification efficiency and water quality outcomes.
- Studying the coupling of ammonification, nitrification, and denitrification processes in marine sediments.
- Calibrating water quality models with direct determinations of sediment-water nutrient fluxes.
Strengths
- Provides high-precision measurements of biogenic N2 fluxes, a direct indicator of denitrification.
- Reports specific denitrification rates (~1.3 mmol N2 m-2 day-1) and efficiencies (75-85%) for key sediment conditions.
- Covers a significant spatial area, with muddy sediments representing about 70% of the seafloor in the bay.
Limitations
- Column-level documentation is absent; field semantics must be inferred after download.
- Row count is unknown, which may limit suitability assessment for large-scale modeling.
- Data may reflect geographic bias inherent to data_gov_au, focusing solely on Port Phillip Bay.
Provenance
- Source
- Australian Ocean Data Network
- Collection Method
- High-precision measurements from benthic chamber deployments in sediments.
- Time Range
- null
- Freshness
- Last updated 2026-04-10 18:18:12.160555; freshness should be verified.
- Geography
- Port Phillip Bay, Australia