Defining the polar vortex edge from an N2O potential temperature correlation

Greenblatt, J.B., H. Jost, M. Loewenstein, J. Podolske, T.P. Bui, D. Hurst, J.W. Elkins, R.L. Herman, C.R. Webster, S. Schauffler, E. Atlas, P. Newman, L.R. Lait, M. Müller, A. Engel, and U. Schmidt (2002), Defining the polar vortex edge from an N2O potential temperature correlation, J. Geophys. Res., 107, 8268, doi:10.1029/2001JD000575.