An Earth analog had been modified by an advanced species to have saltwater seas in an interconnected grid across the planet's surface. The planet has no true oceans and only the large grid network of saltwater seas. Each sea is approximately 80 miles in width and varies in depth from 1 to 2 miles at the deepest. What would the effects on climate be? Would it have an even temperate climate since water can move across the globe or harsh due to lack of oceans?
Edit: Imagine they follow the planet's lines of latitude and longitude.