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Marisa Nicole Repasch

Portrait of  Marisa Nicole Repasch

  • Title
    Postdoctoral Researcher
  • Email
    repasch1@llnl.gov
  • Phone
    (925) 422-7851
  • Organization
    STE PLS-STE AEED-ATMOSPHERIC, EARTH, ENERGY

Research Interests

My research focuses on understanding the role of Earth surface processes (e.g., erosion, sediment transport) in the global carbon cycle. Both natural erosion and human-driven land use change destabilize soils and transfer carbon from one reservoir to another. My goal is to link these physical processes with biogeochemical cycles and quantify their coupled impact on the carbon cycle. Key tools I use include 10Be cosmogenic radionuclide geochronology and radiocarbon measurement, both of which would not be possible without Accelerator Mass Spectrometry (AMS).

PhD, Geosciences, University of Potsdam, Germany, 2021

MS, Earth and Planetary Sciences, University of New Mexico, 2016

BS, Earth and Environmental Sciences, Lehigh University, 2014

Repasch, M., Scheingross, J. S., Hovius, N., Vieth-Hillebrand, A., Mueller, C. W., Höschen, C., et al. (2022). River organic carbon fluxes modulated by hydrodynamic sorting of particulate organic matter. Geophysical Research Letters, 49, e2021GL096343. https://doi.org/10.1029/2021GL096343

Golombek, N. Y., Scheingross, J. S., Repasch, M. N., Hovius, N., Menges, J., Sachse, D., et al. (2021). Fluvial organic carbon composition regulated by seasonal variability in lowland river migration and water discharge. Geophysical Research Letters, 48, e2021GL093416. https://doi.org/10.1029/2021GL093416

Repasch, M., Scheingross, J.S., Hovius, N. et al. Fluvial organic carbon cycling regulated by sediment transit time and mineral protection. Nat. Geosci. 14, 842–848 (2021). https://doi.org/10.1038/s41561-021-00845-7

Scheingross, J. S., Repasch, M. N., Hovius, N., Sachse, D., Lupker, M., Fuchs, M., ... & Schleicher, A. M. (2021). The fate of fluvially-deposited organic carbon during transient floodplain storage. Earth and Planetary Science Letters, 561, 116822.

Repasch, M., Wittmann, H., Scheingross, J. S., Sachse, D., Szupiany, R., Orfeo, O., ... & Hovius, N. (2020). Sediment transit time and floodplain storage dynamics in alluvial rivers revealed by meteoric 10Be. Journal of Geophysical Research: Earth Surface, 125(7), e2019JF005419.

Repasch, M., Karlstrom, K., Heizler, M., & Pecha, M. (2017). Birth and evolution of the Rio Grande fluvial system in the past 8 Ma: Progressive downward integration and the influence of tectonics, volcanism, and climate. Earth-Science Reviews, 168, 113-164.