Influence of episodic wind events on thermal stratification and bottom water hypoxia in a Great Lakes estuary
| Autor: | Bopaiah A. Biddanda, Anthony D. Weinke |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
geography geography.geographical_feature_category Ecology Buoy 010604 marine biology & hydrobiology Hypoxia (environmental) Estuary 010501 environmental sciences Aquatic Science 01 natural sciences Algal bloom Bottom water Oceanography Water column Epilimnion Environmental science Hypolimnion Ecology Evolution Behavior and Systematics 0105 earth and related environmental sciences |
| Zdroj: | Journal of Great Lakes Research. 45:1103-1112 |
| ISSN: | 0380-1330 |
| Popis: | Hypoxia formation and breakdown were tracked during 2015 in Muskegon Lake estuary at multiple locations, and five years (2011–2015) of time-series buoy observatory data were evaluated for the effect of episodic wind-events on lake mixing. Bi-weekly water temperature and dissolved oxygen (DO) profiles at four locations revealed that hypoxia occurred at all sites and persisted for 2–3 months during summer 2015. On one date in late-summer, up to 24% of the lake’s volume was estimated to be mildly hypoxic (DO 7.7 m s−1 for 10 h), indicated that while the wind was unable to completely mix the entire water column, it deepened the epilimnion by ∼1.5 m and sheared a thin layer from the upper hypolimnion. By entraining internally loaded nutrients, such episodic wind-events may initiate and sustain algal blooms in nutrient limited surface waters. Quantifying the variable role of wind and mixing events will be key to integrating limnological processes into climate models of the future. |
| Databáze: | OpenAIRE |
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