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Advisers review draft protocol to measure South Arm salt mass and debate which salinity metric to report
Summary
At a Utah Great Salt Lake Advisory Council meeting, staff presented a draft method to calculate dissolved salt mass and an upper‑brine volume‑weighted salinity for the South Arm; members supported the protocol but debated whether the public and regulatory dashboards should report an upper‑brine concentration or a volume‑weighted metric.
Jeff Denbiker, facilitator for the Utah Great Salt Lake Advisory Council, convened the committee to review a circulated draft protocol for calculating dissolved salt mass and a proposed upper‑brine salinity metric. Christine, the presenter and a GSLIP/USGS scientist, said the document formalizes the group’s approach to estimating South Arm salt mass and a near‑term ecological salinity metric that would inform regulation and management.
The draft documents three main objectives: to document the approach for estimating dissolved salt mass in the South Arm, to define a method for estimating an upper‑brine layer volume‑weighted salinity, and to provide an isomass‑style framework that ties lake elevation, salinity and mass together for short‑term forecasting and management. "So the purpose of this document, there's 3 kind of key things," Christine said while outlining sampling schemes and calculation steps.
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