IMPACT OF ADDITIONAL CONTRIBUTIONS TO THE VERTICAL MIXING FOR THE SIMULATION OF ARCTIC OCEAN AND SEA-ICE STATES
PI and organization: Fabrice Ardhuin (CNRS/LOPS)
Co-Is: Camille Lique (IFREMER), Claude Talandier (CNRS), Mickael Accensi (IFREMER), Marion Huchet (CNRS).
Abstract: The Arctic Ocean is experiencing some rapid transformations, including a fast shrinking of the sea-ice cover, with potential impact on global ocean and climate. A seasonally ice-free Arctic would allow new prospects for socio-economic activities in the region. Understanding and forecasting these changes thus requires an accurate model simulation of the Arctic ocean and sea-ice states. Tey, most Arctic models are largely biased, and vertical mixing has been identified as a key parameter controlling the realism of the ocean and sea-ice states.
Here, we propose to evaluate the effect of the implementation in a high-resolution model of different sources of vertical mixing (namely, the surface waves, tide, and double diffusive mixing) on the simulation of ocean and sea-ice state. The surface wave contribution will be implementing following previous work on the waves impact in ice-free regions, and on-going studies on the impact of waves on sea-ice rheology in the marginal sea-ice zone, and the characterization of the potential feedback on the sea-ice melt via the ocean mixing.
All model developments and the evaluation of the impact of different mixing parameterizations resulting from this project will be directly applicable to the global NEMO ORCA12 configuration used by CMEMS.