Genuine question

Due to a rise in temperatures, the main feature is a rise in ocean levels and death of coral reefs and aquatic animals living near or by the surface/beaches of the ocean. My question to yall (since I don't know anything about the subject), would a rise in water levels decrease the temperature of the ocean near the coasts as sunlight becomes diluted the deeper it passes through the medium of water. I.e. the more ice that melts the more water levels rise the deeper and therefore colder reefs get? Does that make any sense at all? Genuinely curious. Thanks 🙂