1-6: Nitrogen Cycle, Sulfur Cycle; Tropospheric Ozone

Figure 1a - Atmospheric concentration of N2O from 1977-1988. Houghton, J.T., G.J. Jenkins, J.J. Ephraums, eds, 1990: 1990 Intergovernment Panel on Climate Change, Cambridge University Press.

Figure 1b - Atmospheric concentration of N2O from the last 200 years. Houghton, J.T., G.J. Jenkins, J.J. Ephraums, eds, 1990: 1990 Intergovernment Panel on Climate Change, Cambridge University Press.

Figure 2 - Estimated sources and sinks of nitrous oxide. Adapted from table 1.4, p 26, of Houghton, J.T., G.J. Jenkins, J.J. Ephraums, eds, 1990: 1990 Intergovernment Panel on Climate Change, Cambridge University Press

Figure 3 - Nitrogen fertilizer consumption. EPA.

Figure 4 - Annual vs emissions of NOx and SO2 from 1900-1980. EPA.

Figure 5 - Estimated Sources of Nitrogen Oxides

Figure 6 - Nitrogen cycle. J. D. Butler, Air Pollution Chemistry, 1979

Figure 7 - Biogeochemical Processes. U.S. Global Change Research Program.

Figure 8 - Estimated annual global sulfur emissions from 1860-1980. Source unknown.


Figure 9 - Estimated sources of short-lived sulfur gases. Adapted from IPCC, 1992.

Figure 10 - The sulfur cycle in thebiosphere. J. D. Butler, Air Pollution Chemistry, 1979

Figure 11 - Simulated concentrationsof sulfate at 900hPa. IPCC, 1990


Figure 12 - Formation/destruction of tropospheric ozone. Mckee, David J. 1994: Tropospheric Ozone: Human Health and Agricultural Impacts. Lewis Publications, Boca Raton. 333 pp.

Figure 13 - Impacts of high levels of ozone. Mckee, David J. 1994: Tropospheric Ozone: Human Health and Agricultural Impacts. Lewis Publications, Boca Raton. 333 pp.


Figure 14 - Examples of plant yield loss induced by ambient ozone level in various states.

Figure 15 - Summary of ozone concentrations predicted to cause 10 - 30% yield losses and summary of yield losses predicted to occur at 7-h seasonal mean ozone concentrations of 0.04 and 0.06 ppm. McKee, David J., 1994: Tropospheric Ozone.

Figure 16 - Predicted relative soybean yield loss for 1987. McKee, David J., 1994: Tropospheric Ozone. Figure 7, p 193. Reprinted with permission from CRC Press, Inc.

Figure 17 - Predicted relative wheat yield loss for 1987. McKee, David J., 1994: Tropospheric Ozone. Figure 7, p 193. Reprinted with permission from CRC Press, Inc.


Related Class Images

Exchange of gases between ecosystem components and the atmosphere. Global Change International Geosphere - Biosphere Programme, Report No. 12, 1990

Seasonal variation of surface ozone. Houghton, J.T., G.J. Jenkins, J.J. Ephraums, eds, 1990: 1990 Intergovernment Panel on Climate Change, Cambridge University Press.

Summary of O3 concentrations predicted to cause 10 and 30% yield losses. Adapted from McKee, D. I., Tropospheric Ozone: Lewis Publications, 1994.

Plant yeild loss due to tropospheric ozone. Adapted from McKee, D. I., Tropospheric Ozone: Lewis Publications, 1994.