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Temporal Variation in Resuspension Potential and Associated Nutrient Dynamics in Shallow Coastal Environments
Temporal Variation in Resuspension Potential and Associated Nutrient Dynamics in Shallow Coastal Environments
- Source :
- Estuaries and Coasts. 43:1361-1376
- Publication Year :
- 2020
- Publisher :
- Springer Science and Business Media LLC, 2020.
-
Abstract
- Sediment resuspension may play a major role in sediment-water exchange of nutrients, matter and energy in coastal areas where waves and currents dominate sediment transport. Biogeochemical sediment properties regulate sediment erodibility, but there is only limited knowledge of how temporal variability in environmental variables is reflected in the resuspension potential, especially for subtidal habitats. Further, the significance of resuspension on nutrient fluxes in coastal environments has remained unclear as contradicting results have been reported. Here we quantified the temporal variation in resuspension potential metrics (erosion threshold (τc; N m−2) and erosion constant (me; g N−1 s−1)) and associated nutrient fluxes from three sites in the Hanko archipelago (Finland) using a core-based erosion device (EROMES). The sites were sampled bi-monthly from April to December. We also quantified the temporal variation in biogeochemical sediment properties at each site. The τc exhibited the clearest temporal pattern in muddy sediment, where the coefficient of variation (= 67) was two to three times higher than the mixed (= 29) and sandy (= 16) sediments. Dry bulk density was the best predictor for sediment erodibility at all sites explaining 26–46% of the temporal variation in τc despite its limited variability at sandier sites. In addition, temporal variations in the macrofaunal community were important predictors of muddy sediment erodibility and therefore community dynamics need to be considered in sediment transport studies. All sites were potential nutrient sources, yet the overall role of sediment resuspension on nutrient release from the sediments was small.
- Subjects :
- 0106 biological sciences
Biogeochemical cycle
BULK-DENSITY
Baltic Sea
Sediment properties
010504 meteorology & atmospheric sciences
COHESIVE SEDIMENT
Aquatic Science
Coastal areas
01 natural sciences
OXYGEN
Nutrient
ORGANIC-CARBON
14. Life underwater
BENTHIC MACROFAUNA
1172 Environmental sciences
Ecology, Evolution, Behavior and Systematics
0105 earth and related environmental sciences
Total organic carbon
geography
geography.geographical_feature_category
SHEAR-STRESS
Ecology
010604 marine biology & hydrobiology
Sediment
Nutrients
15. Life on land
EROSION THRESHOLD
Bulk density
Oceanography
Erodibility
Archipelago
Erosion
INTERTIDAL SEDIMENTS
Environmental science
Sediment transport
Subjects
Details
- ISSN :
- 15592731 and 15592723
- Volume :
- 43
- Database :
- OpenAIRE
- Journal :
- Estuaries and Coasts
- Accession number :
- edsair.doi.dedup.....f2179d1d8c0545203cc475ebbfc1313e
- Full Text :
- https://doi.org/10.1007/s12237-020-00726-z