Adaptation of NEMO-LIM3 model for multigrid high resolution Arctic simulation

• Main Authors: Hvatov, Alexander, Nikitin, Nikolay O., Kalyuzhnaya, Anna V., Kosukhin, Sergey S.
• Format: Text
• Language: unknown
• Published: arXiv 2018
• Subjects: Atmospheric and Oceanic Physics physics.ao-ph; Software Engineering cs.SE; FOS Physical sciences; FOS Computer and information sciences; Arctic; Arctic Ocean; Sea ice
• Online Access: https://dx.doi.org/10.48550/arxiv.1810.03657; https://arxiv.org/abs/1810.03657

High-resolution regional hindcasting of ocean and sea ice plays an important role in the assessment of shipping and operational risks in the Arctic Ocean. The ice-ocean model NEMO-LIM3 was modified to improve its simulation quality for appropriate spatio-temporal resolutions. A multigrid model setup with connected coarse- (14 km) and fine-resolution (5 km) model configurations was devised. These two configurations were implemented and run separately. The resulting computational cost was lower when compared to that of the built-in AGRIF nesting system. Ice and tracer boundary-condition schemes were modified to achieve the correct interaction between coarse- and fine grids through a long ice-covered open boundary. An ice-restoring scheme was implemented to reduce spin-up time. The NEMO-LIM3 configuration described in this article provides more flexible and customisable tools for high-resolution regional Arctic simulations.