title: Is area integral and area weighted mean possible with xarray?
body: <p>I am new to xarray and I need this functionality often to analyze an output of a general circulation model. I can do this with numpy, but I wonder if a shortcut functions for weighted mean and integral along coordinates, are already implemented in xarray? If not, is there a plan to include them into a future release, or should they belong to packages built on top of xarray?</p>