What is the difference between upwelling and downwelling?

Coastal upwelling occurs when the surface water is replaced by water rising along theshore.The surface water is often rich in nutrients, and prolonged wind can result in increasedbiological productivity.Upwelling can also influence the weather.Coastal downwellinghowever helps to drive water towards the coastline and be forced downward, returning seawardalong the continental shelf.This downwelling helps supply the deeper ocean with dissolvedgases and nutrients and it assist in the distribution of living organisms.Unlike upwelling,downwelling has no direct effect on the climate or productivity of the adjacent coast