%0 Journal Article %T Ertel potential vorticity versus B ernoulli streamfunction in earth's extratropical atmosphere %A Du, J. %A Dowling, T. E. %A Bradley, M. E. %J Journal of Advances in Modeling Earth Systems %V 7 %N 2 %P 437-458 %@ 1942-2466 %D 2015-06-01 %I Wiley Subscription Services, Inc., A Wiley Company %~ DeepDyve