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ARDEX is an independently funded, satellite program of CASES (Canada Arctic Shelf Exchange Study) designed to extend offshore measurements from CCGS Amundsen into the Mackenzie River, freshwater-saltwater transition zone and delta. The overarching objectives of ARDEX are to evaluate the properties of dissolved organic matter (DOM) in the river and coastal waters, and the photochemical, geochemical and biological processes regulating DOM dynamics.

 
A key feature of the Arctic Ocean is the enormous quantities of freshwater that discharge into it from big rivers.

A central component of this discharge is CDOM ”colored dissolved organic matter”.