Global weak solutions to the inviscid 3D Quasi-Geostrophic equation
  In this article, the authors prove the existence of global weak solutions to the inviscid three-dimensional quasi-geostrophic equation. This equation models the evolution of the temperature on the surface of the earth. It is widely used in geophysics and meteorology. 
Marjolaine Puel and Alexis F. Vasseur
math.AP