What's Happening?
A University of Oregon graduate student, Benson, is conducting research on the behavior of lake-terminating glaciers, focusing on Mendenhall Glacier in Juneau and Shakes Glacier near Wrangell, Alaska. This research aims to understand why lake-terminating glaciers are
losing mass at a significantly higher rate compared to marine glaciers. Benson's study involves mapping the topography beneath the lakes, measuring water temperatures, and analyzing sediment levels. At Mendenhall Lake, her team observed that the water became cooler throughout the summer, suggesting increased glacier melt was cooling the system. In contrast, Shakes Lake, which is considerably larger, showed expected warming throughout the season, indicating its size might buffer the temperature changes from glacier melt. Drone mapping at both glaciers revealed caves forming at the base of the glacier faces, along with cooler temperatures and increased sediment in the water, confirming glacier melt through cracks at the base.
Why It's Important?
This research is crucial for understanding the dynamics of glacier melt and its contribution to rising sea levels, a significant global environmental concern. The distinct behavior observed between Mendenhall and Shakes Glaciers highlights the complex and varied ways in which climate change impacts different glacial systems. By focusing on lake-terminating glaciers, Benson's work addresses a gap in current glaciological studies, as these glaciers have shown a more pronounced mass loss. The findings could inform more accurate climate models and predictions regarding future sea-level rise. Furthermore, the involvement of the Wrangell High School Shakes Glacier monitoring team underscores the importance of citizen science and local engagement in environmental research, fostering a deeper understanding of climate issues within affected communities. The study's insights are vital for communities in Alaska and globally that are directly impacted by glacial changes, including potential flooding and alterations to local ecosystems.
What's Next?
Benson's research will likely continue to analyze the collected data from Mendenhall and Shakes Glaciers to further refine the understanding of lake-terminating glacier behavior. Future steps may involve publishing detailed findings, which could contribute to the broader scientific discourse on climate change and glaciology. The ongoing monitoring by the Wrangell High School team will provide long-term data, crucial for tracking changes in Shakes Glacier over time. The insights gained from this study could influence local and regional environmental policies, particularly in areas susceptible to glacier-related impacts such as flooding. The research may also inspire further studies into other lake-terminating glaciers worldwide, leading to a more comprehensive global understanding of glacial melt patterns and their implications for sea-level rise and freshwater resources.
Beyond the Headlines
The study of Mendenhall and Shakes Glaciers delves into the intricate relationship between climate, geography, and glacial melt, revealing that not all glaciers respond to warming temperatures in the same way. The observation that Shakes Lake's size might mitigate temperature changes from melt introduces a nuanced perspective on the factors influencing glacial retreat. This complexity challenges simplistic narratives about climate change and emphasizes the need for localized, detailed research. The collaboration with high school students in Wrangell also highlights the educational and community engagement aspects of scientific research, empowering future generations to become stewards of their environment. Ethically, the rapid retreat of glaciers like Shakes, which has receded nearly two miles since 1999, raises questions about the long-term ecological and cultural impacts on indigenous communities and local wildlife that depend on these natural systems. The research serves as a stark reminder of the visible and measurable effects of climate change on the Alaskan landscape.
