Ilulissat Icefjord Upper‐Layer Circulation Patterns Revealed Through GPS‐Tracked Icebergs

A novel approach using GPS-tracked icebergs reveals that upper-layer circulation in Ilulissat Icefjord, Greenland, is significantly influenced by tributary meltwater runoff and glacier behavior. The study found that increased meltwater discharge can cause icebergs to deviate from their typical down-fjord trajectory, even reversing direction temporarily until the runoff subsides. This dynamic suggests a strong coupling between glacier activity and fjord circulation patterns, which are critical for understanding heat transport in these complex environments. By leveraging freely floating icebergs as natural drifters, researchers successfully quantified circulation over the upper 0–250 meters of the water column during summers 2014 and 2019, addressing long-standing data gaps in this iceberg-rich region. The findings underscore the importance of incorporating tributary fjord dynamics into predictive models of heat transport and glacier behavior.

Baratta, S. J. N., Schild, K. M., & Sutherland, D. A. (2024). Ilulissat Icefjord Upper‐Layer Circulation Patterns Revealed Through GPS‐Tracked Icebergs. Journal of Geophysical Research: Oceans, 129(1). Portico. https://doi.org/10.1029/2023jc020117