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Salinity counts when it comes to sea level

Date:
November 20, 2014
Source:
DOE/Lawrence Livermore National Laboratory
Summary:
Using ocean observations and a large suite of climate models, scientists have found that long-term salinity changes have a stronger influence on regional sea level changes than previously thought.
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Using ocean observations and a large suite of climate models, Lawrence Livermore National Laboratory scientists have found that long-term salinity changes have a stronger influence on regional sea level changes than previously thought.

"By using long-term observed estimates of ocean salinity and temperature changes across the globe, and contrasting these with model simulations, we have uncovered the unexpectedly large influence of salinity changes on ocean basin-scale sea level patterns," said LLNL oceanographer Paul Durack, lead author of a paper appearing in the November issue of the journal Environmental Research Letters.

Sea level changes are one of the most pronounced effects of climate change impacts on Earth and are primarily driven by warming of the global ocean along with added water from melting land-based glaciers and ice sheets. In addition to these effects, changes in ocean salinity also can affect the height of the sea, by changing its density structure from the surface to the bottom of the ocean.

The team found that there was a long-term (1950-2008) pattern in halosteric (salinity-driven) sea level changes in the global ocean, with sea level increases occurring in the Pacific Ocean and sea level decreases in the Atlantic. These salinity-driven sea level changes have not been thoroughly investigated in previous long-term estimates of sea level change. When the scientists contrasted these results with models, the team found that models also simulated these basin-scale patterns, and that the magnitude of these changes was surprisingly large, making up about 25 percent of the total sea level change.

"By contrasting two long-term estimates of sea level change to simulations provided from a large suite of climate model simulations, our results suggest that salinity has a profound effect on regional sea level change," Durack said. "This conclusion suggests that future sea level change assessments must consider the regional impacts of salinity-driven changes; this effect is too large to continue to ignore."

Other collaborators include LLNL's Peter Gleckler, along with Susan Wijffels, an oceanographer from Australia's Commonwealth Scientific and Industrial Research Organization (CSIRO). The study was conducted as part of the Climate Research Program at Lawrence Livermore National Laboratory through the Program for Climate Model Diagnosis and Intercomparison, which is funded by the Department of Energy's Regional and Global Climate Modeling Program.


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Materials provided by DOE/Lawrence Livermore National Laboratory. Note: Content may be edited for style and length.


Journal Reference:

  1. Paul J Durack, Susan E Wijffels, Peter J Gleckler. Long-term sea-level change revisited: the role of salinity. Environmental Research Letters, 2014; 9 (11): 114017 DOI: 10.1088/1748-9326/9/11/114017

Cite This Page:

DOE/Lawrence Livermore National Laboratory. "Salinity counts when it comes to sea level." ScienceDaily. ScienceDaily, 20 November 2014. <www.sciencedaily.com/releases/2014/11/141120133426.htm>.
DOE/Lawrence Livermore National Laboratory. (2014, November 20). Salinity counts when it comes to sea level. ScienceDaily. Retrieved May 17, 2024 from www.sciencedaily.com/releases/2014/11/141120133426.htm
DOE/Lawrence Livermore National Laboratory. "Salinity counts when it comes to sea level." ScienceDaily. www.sciencedaily.com/releases/2014/11/141120133426.htm (accessed May 17, 2024).

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