The nation's ocean and coastal agency: Supporting coastal communities, promoting a robust economy, and protecting coastal and marine ecosystems
a fish Gambell, Alaska grey whales in Monterey Bay National Marine Sanctuary in California Just below the surface of Lake Huron, a diver photographs the German freighter Nordmeer, which ran aground in 1966 and eventually sank in 40 feet of water. The relatively shallow depth of the wreck site provides divers more time to explore the twisted steel hull.
bleached coral
What is ocean acidification?

Ocean acidification refers to a reduction in the pH of the ocean over an extended period time, caused primarily by uptake of carbon dioxide (CO2) from the atmosphere.

More Browse All Facts

Coast Guard Cutter Healy
Making Waves

NOAA experts recently joined the U.S. Coast Guard on a journey to the Arctic on the Coast Guard icebreaker Healy. Their mission: to simulate an oil spill. Listen to our interview.

Listen Arctic Shield

About NOS

The National Ocean Service (NOS) translates science, tools and services into action, to address threats to coastal areas such as climate change, population growth, port congestion, and contaminants in the environment, all working towards healthy coasts and healthy economies.

learn more
Miami coastline


Supporting healthy, resilient coastal communities.


Midway Atoll


Protecting the health, productivity, and diversity of our ocean.


NOAA Coast Survey vessel


Navigation, tides, currents, and geodesy.