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Nitrogen Input to the Gulf of Mexico

^a U.S. Geological Survey, MS406, DFC, Lakewood, CO 80225
^b USGS, Atlanta, GA 30360
^c USGS, Northborough, MA 01532

View larger version (91K): [in a new window]   Fig. 1. Map of the Mississippi–Atchafalaya River basin showing the average annual total nitrogen yields from 42 interior basins, 1980

View larger version (23K): [in a new window]   Fig. 2. Long-term patterns in nitrate concentrations in the lower Mississippi River at St. Francisville, La

View larger version (42K): [in a new window]   Fig. 3. Boxplots showing the distribution of (A) nitrate plus nitrite, and (B) total organic nitrogen concentrations in 42 interior basins for 1980–1996

View larger version (41K): [in a new window]   Fig. 4. Bar chart of the annual flux of nitrate and organic nitrogen from the Mississippi–Atchafalaya River basin to the Gulf of Mexico, 1955–1996

View larger version (24K): [in a new window]   Fig. 5. Boxplots showing the distribution of the annual total nitrogen yields for 42 interior basins, 1980–1996. Dashes (-) show the median yields for several sites where other statistics could not be computed