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Allegra Tashjian

PhD Student

B.A. Geology, Carleton College, 2020
Curriculum Vitae

I use techniques from radiogenic and stable isotope geochemistry to study ocean acidification, climate change, and enhanced rock weathering (ERW). I am broadly interested in using techniques from geochemistry to better predict and mitigate anthropogenic climate change.

Currently, I am investigating changes to marine geochemistry across the Cretaceous-Paleogene (K-Pg; ~65.5 Ma) boundary. This project aims to understand how Deccan volcanism and the bolide impact perturbed seawater carbonate chemistry and biocalcification across this mass extinction event. For another ongoing research project, I am using crop mesocosm experiments to test the efficacy of ERW for carbon sequestration.

Awards

  • Mac Hyde Brownfield Scholarship Recipient, Minnesota Brownfields, Oct. 2019

publications

  • Rich, R., Mueller, P., Fuss, M., Goncalves, S., Ostertag, E., Reents, S., Tang, H., Tashjian, A., Thomson, S. Jensen, K. and Nolte, S., 2023, Design and assessment of a novel approach for ecosystem warming experiments in high-energy tidal wetlands: JGR Biogeosciences, v. 128(11), doi: 10.1029/2023JG007550.

  • “Examining the Effects of Elevated Atmospheric CO2 and Warming on Soil Redox Potential in a Maryland, USA Tidal Wetland” Geological Society of America North Central Section Meeting (Virtual), May 2020

conference Presentations

  • Tashjian, A., Rich, R., Jensen, K., and Nolte, S., 2022, Design and Assessment of Marsh Ecosystem Response to Increase Temperature (MERIT): an ecosystem warming experiment in a high-energy tidal wetland: Abstract GC42J-0832 presented at 2022 Fall Meeting, AGU, Chicago, IL, 12-16 December.
  • Tashjian, A., Noyce, G., and Megonigal, J.P., 2020, Examining the Effects of Elevated Atmospheric CO2 and Warming on Soil Redox Potential: Abstract 13-1 presented at Geological Society of America North Central Section Meeting, 54th, Virtual, 18-19 May.