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concentrations shown by both the model calculations and the data in the vicinity of mile 0, along the southern tip of Manhattan Island, is due to the high number of point source nitrogen discharges located in the lower Harbor.

Chlorophyll-a. On Figure 11.3, panel C shows model and data comparisons for chlorophyll-a (Chl-a). The model results are shown with four curves. The solid line is the model mean in the surface layer and the broken line is the model mean in the bottom layer. The dashed lines show the model maximum and model minimum. Notice that the modelmeans reproduce well the monitoring data collected along the transect which are represented by the filled upwards and downwards pointing triangles, and the model maximum and minimum capture some of the variability in the observed data.

Organic carbon. On Figure 11.4, panel K shows model and data comparisons for particulate organic carbon (POC). POC, like chlorophyll, is also a measure of algal biomass. For POC, the model results are shown by four curves as follows: The solid line is the model calculation in the surface layer. The broken line is the model calculation in the bottom layer. These two lines capture the magnitude of the observed data shown by the symbols. The two dotted lines show the algal fraction of the POC for both surface and bottom layers. In the Hudson River, almost all of the POC is algal POC. The model captures the POC peak concentration near milepoint 25 (HaverstrawBay).

Biochemical oxygen demand (BOD). Panel L on Figure 11.4 shows model and data comparisons for BOD. The model results are shown as ten-day average concentrations in the surface layer (solid line) and in the bottom layer (broken line). Although measured BOD shows a high degree of variability, the ability of the model to calculate average BOD which falls within the range of the measurements indicates that the model correctly calculates the consumption of oxygen (i.e., the sinks of dissolved

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