Dynamics problems for 15/5: 1) …

Dynamics problems for 15/5:

1) The geopotential height contours at 850 mb are oriented east-west, with the height decreasing to the north, and the contours at 750 mb are oriented northwest-southeast, decreasing to the northeast. Is this warm advection or cold?

2) The geopotential in a channel is given by:

Phi = sin(2x) sin(2y)

Show that the advection of vorticity is identically zero.