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

• Published in: Ocean Modelling
• Main Authors: Hvatov, A., Nikitin, N., Kalyuzhnaya, A., Kosukhin, S.
• Format: Article in Journal/Newspaper
• Language: English
• Published: 2019
• Subjects: Arctic; Arctic Ocean; Sea ice
• Online Access: http://hdl.handle.net/21.11116/0000-0004-845D-F; http://hdl.handle.net/21.11116/0000-0004-B873-B

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. © 2019 Elsevier Ltd