Add geostrophic-velocity example
Use sossheig
to calculate geostrophich-surface-velocity EKE just like in this example: https://git.geomar.de/data/documentation/examples/blob/master/example_12_SLTAC_kinetic_energy_with_XGCM.ipynb
Use sossheig
to calculate geostrophich-surface-velocity EKE just like in this example: https://git.geomar.de/data/documentation/examples/blob/master/example_12_SLTAC_kinetic_energy_with_XGCM.ipynb