September 4, 2019 — The salinity levels of water dictate what lives in and around it, and what doesn’t.
If there’s a lot of rain or a sudden surge of fresh water into a bay, salinity levels drop. If there’s a drought a surge of seawater from a major storm, salinity levels tend to rise. Climate change is already altering those balances.
And the changes wrought by those disruptions can be profound.
Earlier this year, heavy rains in the Midwest swelled the Mississippi River. To prevent flooding in New Orleans, the U.S. Army Corps of Engineers opened the Bonnet Carre Spillway, west of the city, twice this year. That sent a torrent of fresh water into the waters off Louisiana and Mississippi, west of Biloxi – and created a disaster along the oyster reefs in the area.