Nearshore hypoxia in the bottom water of the northwestern gulf of Mexico from 1981 to 1984 |
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| Institution: | 1. Division of Life Sciences, Rutgers University, Piscataway, NJ 08854-8082, USA;2. Consortium for Risk Evaluation with Stakeholder Participation (CRESP), Vanderbilt University, Nashville, TN 37325, USA;3. Environmental and Occupational Health Sciences Institute, Rutgers University, Piscataway, NJ 08854, USA;4. Department of Civil and Environmental Engineering, Vanderbilt University, Nashville, USA;5. Pacific Northwest National Laboratory, Richland, WA, USA |
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| Abstract: | Hypoxia, and occasionally anoxia, occur annually in the northern Gulf of Mexico. Important physical properties preceding and partially causing hypoxia and the spatial extent of hypoxia are determined. Temporal trends of salinity, temperature, sigma-t, bottom dissolved oxygen, and river dischar ge offshore Cameron, Louisiana, are described and statistically analyzed using four years (1981–1984) of monthly data. A cruise was conducted in July 1984 to measure the spatial extent of hypoxia in coastal waters from Galveston, Texas, to 74 km east of Cameron, Louisina. A ‘best-fit’ linear model estimating bottom dissolved oxygen concentrations contained the salinity and temperature variables. Time series analysis of the data revealed time lags between low bottom (dissolved oxygen and peak river discharge (2 month lag), and low salinity (1 month lag). The time series model using the river discharge and (density gradient variahles more accurately predicted bottom dissolved oxygen concentrations during hypoxic events |
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