Ursula Jongebloed in Lab (IMAGE)

University of Washington

Ursula Jongebloed in Lab

Caption

Ursula Jongebloed in UW’s IsoLab uses a machine, called a stable isotope mass spectrometer, to measure sulfur isotopes in an ice core from Greenland. Sulfur isotopes in ice cores reveal how sulfate sources — including marine phytoplankton, fossil fuel burning and volcanic emissions — have changed over previous centuries.

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Mark Stone/University of Washington

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