Comparison of the stratospheric polar vortices in five reanalyses datasets

V Lynn Harvey, Laboratory for Atmospheric and Space Physics, Boulder, CO, United States, Jeffrey Allen France, University of Colorado at Boulder, Boulder, CO, United States, Peter Hitchcock, National Center for Atmospheric Research, Boulder, CO, United States, John Andrew Knox, University of Georgia, Athens, GA, United States and Masatomo Fujiwara, Hokkaido Univ, Sapporo, Japan