Polar oceans include spatial variability across a multitude of scales. From the large scale circulation, down to eddies and sub-mesoscale processes. Temporal variability includes long-term trends, climate variability and ocean extremes, as well as seasonal and high-frequency variability. Many studies of polar oceans focus on variability at a particular scale, but there is a lack of understanding of the interactions between different scales, both spatial and temporal. Furthermore, biogeochemical processes and ecosystems, which are being impacted by the rapidly changing polar oceans, respond to these changes across a range of scales. Loss of sea-ice is leading to enhanced variability at the ocean surface. This session aims to advance the understanding of polar ocean variability at different scales, with a particular focus on interactions and impacts. We encourage submissions looking at both polar regions (northern and southern hemisphere) and covering a range of approaches from observational to modelling. Associated studies on air-sea ice processes and interdisciplinary backgrounds are also welcome.