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Unlocking secrets below: Investigating the spatial heterogeneity of carbon stabilization in Arctic lake sediments through a visual lens

Investigators:  Dr. Chelsea Smith (Department of Earth Science), Dr. Allyson Tessin (Department of Earth Science), and Shannon Hines (Design Innovation Hub)

Photo Credit: Smith et al. 

This study aims to investigate the spatial heterogeneity of carbon stabilization in Arctic lake sediments, focusing on Toolik Lake in Northern Alaska. The motivation stems from the significant role that lake sediments play in carbon cycling, particularly in the Arctic, where rapidly rising temperatures are altering ecosystems. Their work emphasizes the importance of understanding how carbon is stabilized or degraded in lake sediments, especially in the face of climate change.

The study will explore the role of iron (Fe) and manganese (Mn) in stabilizing organic carbon (OC) in lake sediments, particularly focusing on the potential impacts of permafrost thaw on carbon cycling. In addition to taking sediment cores, they will use underwater cameras to investigate irregularities in sediment layers within Toolik Lake, which may provide insights into spatial differences in carbon stabilization. A 3D printed camera and light holder for underwater filming has been designed, which will be deployed in the Central Basin of Lake Erie for prototype testing before deployment in Toolik Lake. 

Outreach programs aimed at engaging local schools and Indigenous communities in Arctic science will be an important part of this work. Additionally, the team intends to apply for funding to launch their larger three-year plan, expanding the study to multiple Arctic lakes across Alaska, Greenland, and Svalbard. This extended project will involve sediment and porewater sampling to assess carbon stabilization pathways across different Arctic regions.

Overall, this work combines scientific research with innovative technology development and community engagement efforts to enhance understanding of carbon cycling in Arctic lake sediments and to foster long-term engagement within underrepresented groups in polar research.