Check back soon for more updates from Hannah!
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March 2024
  • Hannah presents research on "Impact of wildfire severity on soil biogeochemistry following wildfire in the California Sierra Nevada" at the 2024 Sierra Nevada Science Symposium at UC Merced

January 2024
December 2023
July 2023
February, March, and April 2023​
New paper on Holocene climate and oceanography draws attention from multiple press outlets
​January 2023
  • Check out a new paper by Hannah and colleagues "Holocene climate and oceanography of the coastal Western United States and California Current System" published this month in Climate of the Past.
    • To better understand and contextualize modern climate change, this systematic review synthesizes climate and oceanographic patterns in the Western United States and California Current System through the most recent 11.75 kyr. Through a literature review and coded analysis of past studies, we identify distinct environmental phases through time and linkages between marine and terrestrial systems. We explore climate change impacts on ecosystems and human–environment interactions.

September 2022
  • Hannah began her fellowship as a AAAS/GSA Congressional Science Fellow!

August 2022
  • Check out a new paper by Hannah and colleagues "Ecological and Environmental Stability in Offshore Southern California Marine Basins Through the Holocene" published this month in Paleoceanography and Paleoclimatology (if are are unable to access the paper from the first link, try here or contact Hannah). 
    • Here is a quick summary of the paper: Globally, marine oxygenation is declining with detrimental impacts to ecosystems and economies. To better understand the drivers and consequences of ocean oxygen change, we can examine the fossil record to identify how oxygenation changed in the past. Specifically, we use the relative abundance and chemistry of microfossils (i.e., foraminifera) to reconstruct past oxygenation. Here, we examined microfossils from three sediment cores in three basins (Tanner, San Nicolas, San Clemente) off the coast of Southern California. Marine dissolved oxygen (below 1,400 m water depth) was relatively stable and lower than modern from 11,000 to 4,700 years before present. San Nicolas Basin experienced a multi-centennial oxygenation episode from 4,700 to 4,300 years before present and oxygenation increased in Tanner Basin gradually from 2,000 to 800 years before present. When compared to modern, the range of values of reconstructed oxygen through the entire time studied (thousands of years) is similar to the range of values of modern oxygen at the same depths, indicating that the changes in the last 10 thousand years were similar to the amount of change occurring on annual and decadal timescales in the modern ocean.

July 2022
  • Check out this press release from UC Merced about Hannah's upcoming fellowship: Palmer Headed for Capitol Hill as Campus’s First Congressional Science Fellow
  • New authored publication out on the future of fire science in PNAS Nexus! See a press release about the paper here!
June 2022
  • Hannah conducted post-fire sampling in the Sequoia and Kings Canyon National Park, collecting ash, litter, and soil samples from recently burned areas. 
May 2022
  • Hannah conducted post-fire sampling in the Sequoia National Forest, collecting ash, litter, and soil samples from recently burned areas. 
April 2022
  • Check out our new paper  "Compilation of a database of Holocene nearshore marine mollusk shell geochemistry from the California Current System" published April 12 in Earth System Science Data.  This project was led by Hannah in collaboration with Veronica Padilla Vriesman, Roxanne Banker, and Jessica Bean. 
    • Here is a short description of the paper: shells of coastal marine organisms can serve as archives of past ocean and climate change. Here, we compiled a database of all available oxygen and carbon isotope values of nearshore marine molluscs from the northeast Pacific coast of North America through the Holocene including both modern collected shells and shells analyzed from midden sites. This first-of-its-kind database can be used to answer archaeological and oceanographic questions in future research.​
March 2022
February 2022
  • Hannah was selected for the AGU Thriving Earth Exchange Community Science Fellowship. As an AGU Thriving Earth Exchange Community Science Fellow, Hannah will facilitate and lead collaborative, co-developed community science projects that produce on-the-ground impact in local communities. Press release.
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November 2021
  • Hannah conducted post-fire sampling in the Sequoia National Forest, collecting ash, litter, and soil samples from recently burned areas. 
  • Hannah's preprint paper on "Oxygenation of offshore Southern California marine basins through the Holocene" is available on ESSOAr. Check it out here.

October 2021
  • Discussion paper and preprint of manuscript "A database of Holocene nearshore marine mollusc shell geochemistry from the Northeast Pacific" is available online. Check it out here!
  • Hannah conducted post-fire sampling in the Sequoia National Forest, collecting ash, litter, and soil samples from recently burned areas. 

September 2021
July 2021
May 2021
  • Hannah attended the NSF Wildfire in the Biosphere workshop! See a summary video of pre-workshop themes here. 
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