As sea level has changed, so has the way we measure it. Here’s a look at some of the technologies climate and marine scientists have used to track Earth’s tides and global sea level over the past two centuries.

How do changes in the equatorial Pacific Ocean impact places much farther away? The answer for the tropics, at least, lies in changes to the equator-wide atmospheric circulation called the Walker Circulation. 

Brian Swett, Chief of Environment, Energy, and Open Space for the city of Boston, talks about maintaining the city's historic heritage while planning for the future.

Across the globe, changes in salinity over time generally match changes in precipitation: places where rainfall declines become saltier, while places where rainfall increases become fresher. Where did saltiness change over the past decade?

Through June, the eastern Pacific was warmer than average, but the lack of a strong gradient in sea surface temperature anomalies between the eastern and western Pacific may have kept the atmosphere from getting in sync with the developing El Niño.

Summary: Explore economic data that characterize the size and makeup of the ocean economy in about 400 counties of the U.S.

Summary: Coastal managers can query observations of select tidal gauges to find out how often and for how long local tides reached a specified elevation throughout their history.

Why hasn't El Niño been declared yet?  The answer might lie in the gradients of sea surface temperatures across the tropical Pacific Ocean.  

Summary: Users can find, view, analyze, and print flood hazard maps from FEMA.

Summary: This comprehensive suite of graphical forecast products shows a range of information on current and projected river levels for almost 4,000 stations in the contiguous United States.