Our work primarily focuses on the coastal ocean dynamics from temperate to arctic regions, with a particular interest on the land-to-sea interface. We intend to decipher the impact of land-to-sea flux alterations on coastal biogeochemistry, ecosystems, and air-sea-sediment gas exchanges. To achieve this, we combine sophisticated numerical models of the ocean, sea ice, and biogeochemistry with both in situ and satellite remote sensing data.