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Paytan Biogeochemistry Lab

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The Paytan Lab is constantly developing new projects and changing the direction of current projects.  Please be aware that these brief descriptions may change at any time.

Publications related to each project are included with the project summary. Check out our Publicationsfor the complete list of Paytan Lab publications by year.

Ongoing Projects

Paleoceanography

• Sulfur isotopic composition of seawater sulfate over the past 120 million years and its potential effect on atmospheric oxygen.

• Constructing a high resolution productivity, S isotope, and P accumulation curve across the Paleocene Eocene Thermal Maximum (PETM).

• Barite used as an indicator of productivity during global ocean anoxic events.

• Seawater calcium isotopes and carbonate deposition history.

• C and N isotopes in peat bogs.

• Reconstructing climate variability, aridity and water availability in the Sacramento-San Joaquin watershed based on isotopic evidence in sediments from Swamp Lake, Yosemite NP

Biogeochemicla Cycling

• Porewater Characteristics of Mangrove Sediments.

• Using oxygen isotope ratios in phosphate to determine phosphorus turnover rates in the ocean.

• Subterranean groundwater nutrient input to coastal oceans and coral reef sustainability.

• Nutrient dynamics and ecosystem structure in the Gulf of Aqaba : physical forcing and external nutrientsSources.

• Selective phosphorus regeneration of sinking marine particles: Evidence from ³¹P-NMR.

• Distribution of harmful algae and their toxins in San Francisco Estuary.

Isotopic Tracers of Biological Processes

• Aerosol flux and nutrient and phosphate sources in Lake Tahoe.

• Aerosol flux and nutrient sources to Monterey Bay and Elkhorn Slough.

• Reconstructing fire history using lake sediments from the Sea of Galilee, Israel.

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Past Projects

Paleoceanography

• Understanding the contribution of Southern Ocean Glacial-Interglacial export production changes to global climate change.

• Reconstructing the seawater Sr/Ba ratio using marine barite in order to incite changes in chemical weathering rates and dissolution fluxes to the oceans.

• Developing a Sr isotope stratigraphy curve for the Cretaceous using marine barite.

• Ca isotopes in corals as a new paleo-thermometer.

Biogeochemical Cycling

• Methane Cycling and Flux in Mangrove Ecosystems: A Field Study of Tropical Coastal Lagoons on the Yucatan Peninsula, Mexico.

• Organic Matter Sources and Contribution to Mangrove Ecosystems.

• Phosphorus Distribution in Oceanic Particulate Matter.

• Hydrodynamic modeling of Elkhorn Slough, California.

• Nitrogen dynamics in Elkhorn Slough and multi isotope approach.

Isotopic Tracers of Biological Processes

• Sr isotopes in raptor pellet, constraints on raptor feeding range.

• An Examination of Prehistoric Residence Change in Middle Horizon, Peru  Using Multiple Isotopic Analyses.

• Isotopic variability in modern bison: Implication for paleoenvironmental reconstructions.

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