Potential Vorticity Estimates in the South Polar Vortex from ER-2 Data

Hartmann, R. Chan, B. L. Gary, M. R. Schroeberl, P. Newman, R. L. Martin, M. Loewenstein, J. Podolske, and S. Strahan (1989), Potential Vorticity Estimates in the South Polar Vortex from ER-2 Data, J. Geophys. Res., 94, 11,625-11.