Figure 10.2. Relationship between freshwater discharge and water residence time (A), GPP (B), and light penetration (C) in the estuary during 25 cruises conducted during the spring, summer, and fall of 1994, 1995, and 1997. Open symbols represent times when tidal amplitude was < 1.15 m;dark symbols represents tides greater than 1.15 m. The dashed line in (B) represents the approximate value for GPP above which an estuary is considered to be hypereutrophic. Discharge data are from the USGS monitoring station at Green Island and represent approximately two-thirds of the total discharge into the estuary. Reprinted from Howarth etal. (2000a).
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