The Beach Bioreactor: Unraveling the Anomaly of Intensive Remineralization above a Deep Oxycline.
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Environmental science & technology
2025
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| author | Auer, Felix Greskowiak, Janek Meyer, Rena Reckhardt, Anja Holtappels, Moritz |
| author_facet | Auer, Felix Greskowiak, Janek Meyer, Rena Reckhardt, Anja Holtappels, Moritz Auer, Felix Greskowiak, Janek Meyer, Rena Reckhardt, Anja Holtappels, Moritz |
| collection | PubMed - marine biology |
| contents | The Beach Bioreactor: Unraveling the Anomaly of Intensive Remineralization above a Deep Oxycline. Auer, Felix Greskowiak, Janek Meyer, Rena Reckhardt, Anja Holtappels, Moritz Seawater Oxygen Bioreactors Seasons Bathing Beaches Germany High-energy beaches receive high inputs of organic matter from seawater infiltration, fueling intensive oxygen (O) consumption rates in the upper sand layer, which depend on seasonal variations in temperature and organic matter supply and can exceed 10 times the average subtidal rates during the growing season. Despite the intensive rates, recent studies have found deep O penetration underneath, extending down several meters. To investigate this anomaly, we applied a reactive transport model to simulate O supply and consumption for winter and summer conditions. Well-known conditions at a high-energy beach on Spiekeroog Island, Germany, were used to define topography, hydraulic conductivity, tide, and wave amplitudes, and the model was built using measured O distribution and O consumption rates. The tide-resolving model was capable of simulating the periodic tidal desaturation of the surface layer. We found that the aeration with atmospheric O during desaturation is a significant O source, contributing up to 30-60% of total O consumption. Meanwhile, seawater O quickly bypasses the upper reactive layer, extending the oxycline to depths of 11-16 m in the summer and winter, respectively. This mechanism mitigates the seasonal imprint into deeper layers yet promotes intensive aerobic OC remineralization of up to 0.7 gC m d. |
| format | Artículo científico |
| id | pubmed_40940311 |
| institution | PubMed |
| language | en |
| publishDate | 2025 |
| publisher | Environmental science & technology |
| record_format | pubmed |
| spellingShingle | The Beach Bioreactor: Unraveling the Anomaly of Intensive Remineralization above a Deep Oxycline. Auer, Felix Greskowiak, Janek Meyer, Rena Reckhardt, Anja Holtappels, Moritz Seawater Oxygen Bioreactors Seasons Bathing Beaches Germany The Beach Bioreactor: Unraveling the Anomaly of Intensive Remineralization above a Deep Oxycline. Auer, Felix Greskowiak, Janek Meyer, Rena Reckhardt, Anja Holtappels, Moritz Seawater Oxygen Bioreactors Seasons Bathing Beaches Germany High-energy beaches receive high inputs of organic matter from seawater infiltration, fueling intensive oxygen (O) consumption rates in the upper sand layer, which depend on seasonal variations in temperature and organic matter supply and can exceed 10 times the average subtidal rates during the growing season. Despite the intensive rates, recent studies have found deep O penetration underneath, extending down several meters. To investigate this anomaly, we applied a reactive transport model to simulate O supply and consumption for winter and summer conditions. Well-known conditions at a high-energy beach on Spiekeroog Island, Germany, were used to define topography, hydraulic conductivity, tide, and wave amplitudes, and the model was built using measured O distribution and O consumption rates. The tide-resolving model was capable of simulating the periodic tidal desaturation of the surface layer. We found that the aeration with atmospheric O during desaturation is a significant O source, contributing up to 30-60% of total O consumption. Meanwhile, seawater O quickly bypasses the upper reactive layer, extending the oxycline to depths of 11-16 m in the summer and winter, respectively. This mechanism mitigates the seasonal imprint into deeper layers yet promotes intensive aerobic OC remineralization of up to 0.7 gC m d. |
| title | The Beach Bioreactor: Unraveling the Anomaly of Intensive Remineralization above a Deep Oxycline. |
| topic | Seawater Oxygen Bioreactors Seasons Bathing Beaches Germany |
| url | https://pubmed.ncbi.nlm.nih.gov/40940311/ |