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Origins and Transformations of dissolved organic matter in Arctic rivers (NSF-EAR)
Origins and Transformations of dissolved organic matter in Arctic rivers (NSF-EAR)
Arctic rivers are the dominant pathway for the transport of terrestrial dissolved organic carbon (tDOC) to the Arctic Ocean. We are investigating sources and transformations of tDOC in the Kolyma, Lena, Yenisei, Ob, and Mackenzie. This project is funded by NSF Geobiology Low-Temperature Geochemistry.
Collaborative Research: Calibration and application of vascular plant and aqueous microbial biomarkers to examine transformations of dissolved organic matter (NSF-OCE)
Collaborative Research: Calibration and application of vascular plant and aqueous microbial biomarkers to examine transformations of dissolved organic matter (NSF-OCE)
Together with the Hernes Lab at UC Davis and the Spencer Lab at FSU we are investigating DOM sources and transformations in San Francisco Bay and Sacramento/San Jaoquin Delta. Our approach includes experimental and field work using environmental metabolomics, biomarker analysis, and high resolution mass spectrometry. This work is funded through NSF Chemical Oceanography.
Development and application of a high sensitivity, ultra-low volume method to measure biomarkers of terrigenous organic matter in the open ocean (NSF-OCE)
Development and application of a high sensitivity, ultra-low volume method to measure biomarkers of terrigenous organic matter in the open ocean (NSF-OCE)
Our lab adapted John Hedges' method to measure lignin in ultra-low sample volumes or without pre-concentration. The new method allows measurement of lignin phenols in 150 mL of North Atlantic Deep Water. For freshwater no pre-concentration is necessary.
We are applying the new method to investigate terrigenous DOC removal in the Arctic Ocean and halocline formation on the Arctic shelves.
This work is funded by NSF Chemical Oceanography.
Collaborative research: Does dissolved organic matter influence the concentrations and distributions of trace elements in the Arctic Ocean? (NSF-Polar Programs)
Collaborative research: Does dissolved organic matter influence the concentrations and distributions of trace elements in the Arctic Ocean? (NSF-Polar Programs)
This project is in collaboration with Dr. Rainer Amon (Lead-PI) at Texas A&M Galveston and Dr. Ronald Benner at USC. We are investigating the transport of trace elements by complexation with terrestrial DOC or DOC generated on the productive shelf areas.
Our work is funded through NSF Arctic Research Opportunities.
Dissolved free amino acids as odorants for homing by salmon (US Fish & Wildlife)
Dissolved free amino acids as odorants for homing by salmon (US Fish & Wildlife)
In collaboration with US Fish & Wildlife (Dr. Bill Ardren) and Boston University (Dr. Jelle Atema, David Minkoff) we test if amino acids act as imprinting odorants for Atlantic salmon. Support for this work is through US Fish & Wildlife.
Past and Present development in Antarctica under Warm Climates
Past and Present development in Antarctica under Warm Climates
We are working with Dr. Julie Loisel (TAMU), Dr. Dave Beilman (University of Hawai'i) and Dr. Zicheng Yu (Lehigh University) to understand peatland dynamics in Antarctica.
Organic matter cycling in oxygen minimum zoneS
Organic matter cycling in oxygen minimum zoneS
Together with Dr. Brett Walker (UCI) and Dr. Hussain Abullah (TAMU-CC) we collected samples along the CLIVAR P18 transect. More to come as the project develops.
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