Use Case 8

###Computing a zonal mean Use Case: Computing a zonal mean
Actor: Climate/Data Scientist
Background: most fields have a strong latitudinal component and it can be easier to look at them once it has been zonally averaged.
Use Scenario:

1. identify need file(s) to cover time period
2. identify "zonal" dimension (longitude)
3. average over "zonal" dim
4. dump out result

Difficulties:
Possible variation: Use level instead of longitude average
Frequency: Medium
Criticality: Medium
Risk: Medium