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Spatiotemporal Variability of Wet Atmospheric Nitrogen Deposition to the Neuse River Estuary, North Carolina

University of North Carolina at Chapel Hill, Institute of Marine Sciences, 3431 Arendell St., Morehead City, NC 28557

View larger version (27K): [in a new window]   Fig. 1. Relative contribution of various nitrogen (N) sources to the atmospheric N emissions budget for North Carolina (black) and coastal North Carolina (white). Statewide N emissions total 334748 Mg/yr (coastal plain total = 155931 Mg/yr). From North Carolina Department of the Environmental and Natural Resources Division of Air Quality (1996).

View larger version (34K): [in a new window]   Fig. 2. Site location map. Numbers show the locations of wet atmospheric deposition of nitrogen (WAD-N) collectors and rain gauges (see also Table 1). The WAD-N and rain gauge pairings are shown with like shapes. Zones shown are delineations for in-stream N degradation model (see Table 3). IMS is the University of North Carolina-Chapel Hill Institute of Marine Sciences in Morehead City.

View larger version (28K): [in a new window]   Fig. 3. Spatial distribution of average annual wet atmospheric deposition of nitrogen (WAD-N flux). Watershed subdivision polygons were determined via the Theissan method and were used for spatially weighted flux calculations. The annual flux for Polygon 6 is significantly greater (one-way ANOVA post-hoc Bonferroni means analysis, = 0.05).

View larger version (24K): [in a new window]   Fig. 4. Seasonal variability in weekly wet nitrogen deposition (black bars) and precipitation depth (white bars) for 11 sites pooled. Letters show significant differences between groups (one-way ANOVA with post-hoc Bonferroni analysis, = 0.05). Groups with common letters are not significantly different from each other.