I am writing a story where a freak magical accident causes a fully-formed landmass to pop into existence like it was there all along.
For the purposes of this question, let's assume:
- the continent isn't very large, a bit smaller than Australia
- the continent appears shortly southwest of Cape of Good Hope, obstructing the Benguela Current (image)
- the continent magically replaces the water instead of displacing it
- the continent has a mature ecosystem, with a east-west mountain range that would obstruct natural winds
- the continent has an atmosphere & humidity level that matches its ecosystem
- this happens in a climate that is prior to the Industrial Revolution (no greenhouse gases or ozone damage)
- effects related to the crust & fault lines shall be handwaved
What would happen to local and global climates as the currents readjusted to the new landmass? Would there be unusual winds or storms forming; would the diverted water cause any flooding or tsunamis?