Effects of short‐term variations in sea level on dissolved oxygen in a coastal karst aquifer, Quintana Roo, Mexico
| Autor: | Ismael Mariño-Tapia, Mario Rebolledo Vieyra, Jonathan B. Martin, Caitlin Young, Andrea J. Pain, Jackie Branyon, Arnoldo Valle-Levinson |
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| Rok vydání: | 2017 |
| Předmět: |
Hydrology
geography Biogeochemical cycle geography.geographical_feature_category 010504 meteorology & atmospheric sciences Brackish water 0208 environmental biotechnology Aquifer 02 engineering and technology Aquatic Science Oceanography 01 natural sciences Submarine groundwater discharge 020801 environmental engineering Spring (hydrology) Seawater Saltwater intrusion Groundwater Geology 0105 earth and related environmental sciences |
| Zdroj: | Limnology and Oceanography. 63:352-362 |
| ISSN: | 1939-5590 0024-3590 |
| Popis: | Sea-level rise should cause salt-water intrusion into coastal aquifers and limit fresh submarine groundwater discharge. Pargos Spring offshore of Puerto Morelos, Quintana Roo, Mexico, intermittently discharges brackish water and allows intrusion of lagoon water with seawater salinity to the aquifer. Lagoon water intrusion occurred when sea level was > 0.08 m above mean observed values during the study period. Salt water intrusion will be permanent within a few decades at the current eustatic sea-level rise rate of ∼ 3 mm/yr. A mixing model demonstrates that oxygen dissolved in the lagoon water is reduced as it intrudes the spring. Dissolved oxygen (DO) reduction is greater at the spring vent than at sensors ∼ 10 m inside the conduit, reflecting rapid reaction kinetics. DO reduction results from organic carbon remineralization, which also releases N and P to the water. Increased frequency of intrusion events or continuous intrusion may alter microbially mediated biogeochemical reactions, thereby increasing aquifer vulnerability to sea-level rise. |
| Databáze: | OpenAIRE |
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