pressure zonal changes
| zone | season | pressure |
|---|---|---|
| land | winter | high |
| summer | low | |
| ocean |
seasons
| hemisphere | end year | mid year |
|---|---|---|
| northern | winter | summer |
| southern | summer | winter |
ITCZ changes
mid_year = move north end_year = move south
max range of movement: ocean 5 degrees land 40 degrees