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Why Is The Ocean Salty?

Date:
October 14, 2007
Source:
University of Wisconsin-Madison
Summary:
The saltiness of the sea comes from dissolved minerals, especially sodium, chlorine, sulfur, calcium, magnesium, and potassium, says a professor of atmospheric and oceanic sciences. Today's ocean salt has ancient origins. As the earth formed, gases spewing from its interior released salt ions that reached the ocean via rainfall or land runoff.

Pacific Ocean at dawn. Today’s ocean salt has ancient origins. As the earth formed, gases spewing from its interior released salt ions that reached the ocean via rainfall or land runoff.
Credit: Michele Hogan

The saltiness of the sea comes from dissolved minerals, especially sodium, chlorine, sulfur, calcium, magnesium, and potassium, says Galen McKinley, a UW-Madison professor of atmospheric and oceanic sciences.

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Today’s ocean salt has ancient origins. As the earth formed, gases spewing from its interior released salt ions that reached the ocean via rainfall or land runoff.

Now, the ocean’s salinity is basically constant. “Ions aren’t being removed or supplied in an appreciable amount,” McKinley says. “The removal and sources that do exist are so small and the reservoir is so large that those ions just stay in the water.” For example, she says, “Each year, runoff from the land adds only 0.00005 percent of total ocean salts.”

In lakes, relatively rapid turnover of water and its dissolved salts keeps the water fresh – a water droplet and its ions will stay in Lake Superior for about 200 years, compared to roughly 100 to 200 million years in the ocean. “Even if you did have any accumulation of an ion in a lake, it would be washed out quickly,” McKinley explains.

Ocean salts, however, have no place to go. “The ions that were put there long ago have managed to stick around,” McKinley says. “There is geologic evidence that the saltiness of the water has been the way that it is for at least a billion years.”


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The above story is based on materials provided by University of Wisconsin-Madison. Note: Materials may be edited for content and length.


Cite This Page:

University of Wisconsin-Madison. "Why Is The Ocean Salty?." ScienceDaily. ScienceDaily, 14 October 2007. <www.sciencedaily.com/releases/2007/10/071012104955.htm>.
University of Wisconsin-Madison. (2007, October 14). Why Is The Ocean Salty?. ScienceDaily. Retrieved October 30, 2014 from www.sciencedaily.com/releases/2007/10/071012104955.htm
University of Wisconsin-Madison. "Why Is The Ocean Salty?." ScienceDaily. www.sciencedaily.com/releases/2007/10/071012104955.htm (accessed October 30, 2014).

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