[19-May-2026] Schmidgall, C., Gaube, P., Shcherbina, A., Steele, M., and Thomson, J. Under anthropogenic climate change, the Arctic Ocean is experiencing significant declines in sea ice extent and shifts in seasonality, impacting ocean dynamics, Arctic ecosystems and communities, and global climate. Accurately describing the present state of the Arctic Ocean and projecting future changes requires a detailed description of temperature and salinity at small scales. The underway conductivity-temperature-depth (uCTD) instrument samples ocean state variables at high spatial resolution (0.5-1km in horizontal and 10cm in vertical) providing insight into the processes shaping ocean stratification and heat content. In this poster, we showcase hydrographic observations collected by the uCTD instrument during the NASA Salinity and Stratification at the Sea Ice Edge (SASSIE) field campaign, and highlight research using this dataset.