Wofsy, S., G.W. Sachse, G.D. Gregory, J. Bradshaw, S. Sandholm, H.B. Singh, J.D.W. Barrick, R. Harriss, D. Jacoband, and L. Logan (1991), Factors Regulating Atmospheric Chemistry in the Arctic and Subarctic: Natural Fires, Midlatitude Industrial Sources, and Stratospheric Inputs, J. Geophys. Res., In press.