Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 43, Issue 6, Pages 2693-2699Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2015GL067521
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- U.S. EPA Office of Research and Development, an Oak Ridge institute for the Science and Education (ORISE) appointment for Chengfeng Le to the EPA Research Participation Program
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Satellite-based empirical models explaining hypoxic area and volume variation were developed for the seasonally hypoxic (O-2 < 2 mg L-1) northern Gulf of Mexico adjacent to the Mississippi River. Annual variations in midsummer hypoxic area and volume were related to Moderate Resolution Imaging Spectroradiometer-derived monthly estimates of river plume area (km(2)) and average, inner shelf chlorophyll a concentration (Chl a, mg m(-3)). River plume area in June was negatively related with midsummer hypoxic area (km(2)) and volume (km(3)), while July inner shelf Chl a was positively related to hypoxic area and volume. Multiple regression models using river plume area and Chl a as independent variables accounted for most of the variability in hypoxic area (R-2=0.92) or volume (R-2=0.89). These models explain more variation in hypoxic area than models using Mississippi River nutrient loads as independent variables. The results here also support a hypothesis that confinement of the river plume to the inner shelf is an important mechanism controlling hypoxia area and volume in this region.
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