New study identifies thermometer for global ocean

phys.org | 1/3/2018 | Staff
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There's a new way to measure the average temperature of the ocean thanks to researchers at Scripps Institution of Oceanography at the University of California San Diego. In an article published in the Jan. 4, 2018, issue of the journal Nature, geoscientist Jeff Severinghaus and colleagues at Scripps Oceanography and institutions in Switzerland and Japan detailed their ground-breaking approach.

Determining changes in the average temperature of the entire world's ocean has proven to be a nearly impossible task due to the distribution of different water masses. Each layer of water can have drastically different temperatures, so determining the average over the entirety of the ocean's surface and depths presents a challenge.

Severinghaus - Colleagues - Obstacles - Value - Water

Severinghaus and colleagues were able to bypass these obstacles by determining the value indirectly. Instead of measuring water temperature, they determined the ratio of noble gases in the atmosphere, which are in direct relation to the ocean's temperature.

"This method is a radically new way to measure change in total ocean heat," said Severinghaus. "It takes advantage of the fact that the atmosphere is well-mixed, so a single measurement anywhere in the world can give you the answer."

Study - Scientists - Values - Gases - Krypton

In the study, the scientists measured values of the noble gases argon, krypton, and xenon in air bubbles captured inside ice in Antarctica. As the oceans warm, krypton and xenon are released into the atmosphere in known quantities. The ratio of these gases in the atmosphere therefore allows for the calculation of average global ocean temperature.

Measurements were taken from ice samples collected during the West Antarctic Ice Sheet (WAIS) Divide coring project, of which Severinghaus is a leader. Over the course of six field seasons in Antarctica, a drill removed ice in cylindrical samples 3.7 meters (just under 9 feet) in length. The final sample was taken at a depth of 3,405 meters (over 11,000...
(Excerpt) Read more at: phys.org
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