By the mid-1980s, nitrogen isotope biogeochemical methods were firmly established at the Geophysical Lab; other projects followed. In 1984, Hoering and I connected with Professor Jon Sharp and his student Luis Cifuentes at the College of Marine Studies, University of Delaware. Luis was an up and coming graduate student and interested in using stable isotopes to track estuarine processes in the Delaware Bay. Wisdom on how organic matter transferred from terrestrial to marine environments was based primarily on simple mixing models using terrestrial and marine organic matter as end members. For example, using carbon isotopes from suspended particulate organic matter...

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