Ursula Jongebloed in Lab (IMAGE)
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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