A Kinetic Model of Copper Cycling in San Francisco Bay
| Autor: | Terry Cooke, Barton A. Forman, Louis Armstrong, Brad Bessinger, Philip Mineart, Vivian Lee |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2006 |
| Předmět: |
cycling
water chemistry.chemical_element Aquatic Science estuary Water column Settling lcsh:Environmental sciences Water Science and Technology Hydrology lcsh:GE1-350 geography geography.geographical_feature_category model MIKE 21 Sediment Estuary Copper chemistry sediment Benthic zone adsorption kinetics copper desorption Environmental science Water quality Bay |
| Zdroj: | Bessinger, Brad; Cooke, Terry; Forman, Barton; Lee, Vivian; Mineart, Philip; & Armstrong, Louis. (2006). A Kinetic Model of Copper Cycling in San Francisco Bay. San Francisco Estuary and Watershed Science, 4(1). Retrieved from: http://www.escholarship.org/uc/item/3tz3r2ht San Francisco Estuary and Watershed Science, Vol 4, Iss 1 (2006) |
| Popis: | A two-dimensional, depth-averaged kinetic model of copper cycling was developed for the San Francisco Bay estuary. Adsorption and desorption reaction rate constants were determined from experimental sorption experiments. To calibrate the model, processes related to aqueous speciation were included. The model was used to predict spatial and seasonal trends in the adsorption and desorption of copper. Model predictions show that copper is continually being re-partitioned between sediment and water. Re-partitioning is prevalent near tributary and anthropogenic sources. It also occurs between segments of the bay, in response to differences in salinity and the availability of organic ligands dissolved in the water. In areas of restricted circulation such as the South Bay, copper adsorbed onto settling particles during wet season storm events acts as a source to the water column during the dry season. The relative contribution of resuspended benthic sediment to dissolved copper concentrations is highly variable in the bay. In the North Bay, dissolved copper is principally introduced from the San Joaquin-Sacramento Delta. In the South and lower South bays, desorption from sediment during the dry season may contribute as much as 20% of the total mass input of dissolved copper. Improvement of water quality can be achieved by reducing loads; however, changes are predicted to take years. |
| Databáze: | OpenAIRE |
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