Penn State Grad Student Charts Climate Research Career Path

Sometimes two weeks can change the trajectory of an entire career, and for Sierra Hill, that moment came during an intensive climate science training program in Indiana.

Hill, a master's student at Penn State, spent two weeks at FluxCourse learning to track how carbon, water, and energy move between land and atmosphere. The training brings together early-career scientists and experts from around the world to master techniques critical for understanding climate change.

The program introduced Hill to eddy-covariance science, a method that helps researchers measure how much carbon dioxide forests and ecosystems absorb. By the end, her team had completed a small research project examining different filtering techniques based on wind patterns and seasons.

"I think in five or 10 years, I will look back and remember those two weeks as a pivotal moment in my career," Hill said.

Hill's path to Penn State started at Texas A&M University, where a professor who spoke highly of Penn State's program encouraged her to apply for a Research Experiences for Undergraduates program in 2024. She worked with Kenneth Davis, a professor of atmospheric and climate science, studying carbon sources and sinks.

When the summer program ended, Hill wanted more. She asked Davis to extend her research another year, work that eventually helped her earn a spot in his graduate research group and led to a presentation at the American Meteorological Society Annual Meeting.

The Ripple Effect

Hill's research tackles a puzzle that has frustrated climate scientists for years. Flux towers measure energy moving into and out of ecosystems, and in theory, those numbers should balance. They often don't.

"That is a problem because energy cannot be created nor destroyed," Hill said. The mismatch points to processes scientists still don't fully understand, and solving these gaps matters because accurate measurements help researchers determine how much carbon dioxide forests absorb worldwide.

Those estimates become critical for understanding global carbon cycling and climate change. Hill now applies her training to operating her research group's flux tower in Baltimore and processing data for the AmeriFlux repository, where measurements are shared openly with other researchers.

What draws Hill to the work is the complexity itself. Atmospheric science involves so many interacting processes that researchers often have to simplify some phenomena to fit the limits of computing power. Those gaps fascinate her most.

"I really enjoy learning and fixing things," Hill said. "Every time I have come across one of these simplifications or areas that have yet to be comprehensively studied, it astounds me that an answer has yet to be found."

Hill hopes to become a science educator, bringing together her love of discovery with her desire to help others understand our changing climate. She returned from Indiana with what she calls a "laundry list" of research ideas to investigate.

Hill's journey shows how a single summer experience can light the path toward meaningful scientific contribution and a career spent answering questions that matter for our planet's future.