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Sea ice/snow surface interactions with the atmosphere are major drivers of large-scale patterns of sea ice flows and deformations in Polar Regions. Climate and weather prediction models require parameterizations of the subgrid-scale surface drag caused by the interactions between the ice/snow surfaces and surface winds. Here, we report on the results from a two part study, in which we combine the analysis of sea ice/snow surface topography at very high-resolutions (~ 1-10 cm), local wind measurements, and Large Eddy Simulations (LES) of fully developed wind flow to study surface drag and roughness from process scales to floe scales (~ 1 cm-100 m). In this part, we focus on the analyses and implications of the results from the LES using the aforementioned dataset, while on the first part of the series we focus on the technical details of the LES. The snow/ice elevations were obtained using a Terrestrial Laser …