Appendix A. Figures of trends in dissolved oxygen, temperature, and salinity data at two sites representing extremes in hypoxia conditions in our study area.
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| FIG. A1. Continuous (A) dissolved oxygen, (B) temperature, and (C) salinity data from bottom water at 2 sites representing extremes of the estuarine gradient spanning our study area (A in north and J in south). Temperature and salinity values were similar at both sites. Notably, DO fell to hypoxic levels (< 2 mg/L) at site A, but never at site J, at several times during the summer. Slightly depressed temperatures, and elevated salinity values associated with hypoxia at site A are indicative of higher density waters associated with stratification of the water column and hypoxic conditions. Values presented are 24-h averages centered on midnight of a given day. Oceanographic data were collected by continuous data logging sondes owned and maintained by Dana Kester University of Rhode Island (site A), and Narragansett Bay National Estuarine Research Reserve (site J). |