The Isotope Biogeochemistry Group specializes in high-precision measurements of the light (stable) isotopic ratio as well as dissolved gas composition as tracers of marine biogeochemical processes.

Applications:

• Global oceanic biogeochemistry, particularly nitrogen and carbon cycling
• Paleoceanography and past climate change
• Identifying the controls on atmospheric CO₂
• Tracing/monitoring nitrogen pollution sources
• Understanding the causes of hypoxia/anoxia

Equipment:

• Isotope ratio mass spectrometers
• Quadruple mass spectrometer
• Gas chromatographs
• Automated nutrient analyzer

Recent Activities:

• Peru Margin paleoceanography
• Peru-Chile Oxygen Minimum Zone nitrogen loss
• Zooplankton N₂ fixation
• Long Island Sound eutrophication and hypoxia
• Mussel nitrogen regeneration