n><span class="n">v</span><span class="p">,</span><span class="n">dx</span><span class="p">,</span><span class="n">dy</span><span class="p">)</span> <span class="k">result</span><span class="p">(</span><span class="n">dfdt</span><span class="p">)</span>

  <span class="c">!! Computes the 2-d advective tendency of an input field f given the advective</span>
  <span class="c">!! velocity field u and v [m/s] and grid spacing dx and dy [m], using a second</span>
  <span class="c">!! order centered differencing.