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Getting Started

Welcome to the documentation for the North-Atlatic-ARCtic (NAARC) configuration

Introduction

As part of the Climate Change in the Arctic and North Atlantic Region and Impacts on the UK (CANARI) project, the National Oceanography Centre has developed a regional NEMO configuration of the North Atlantic and Arctic oceans.

Configuration 🌐

The NAARC configuration is based on NEMO v4.2.2 with a horizontal resolution of 1/12\(^{\circ}\).

The key features are summarised below:

  • 1/12\(^{\circ}\) nominal horizontal resolution (j=3605, i=4320).
  • 75 vertical Multi-Evelope s-levels (MEs).
  • Coupled to SI\(^{3}\) sea ice engine.
  • Initialised from eORCA025 NOC-Near-Present-Day (1979) simulations.
  • Forced with JRA55-do (v1; 1976-2023) atmospheric and riverine forcing.

For more details on the NAARC configuration see Deep Dives: Model Configurations.

Quick Start 🚀

Installation

To get started, check out and set up an instance of the NAARC GitHub repository:

git clone git@github.com:NOC-MSM/NAARC.git
Helpful Tip...
  • It is not advised to checkout the respository in your home directory.

Next, run the setup script to download NEMO & compile the tools and configurations. At present the setup script has been tested and will checkout, compile and run the NAARC (NEMO 4.2.2) code on: ARCHER2 for Cray-MPICH and GNU-MPICH, and Anemone for iFort.

cd NAARC

./NAARC/scripts/setup/NAARC_setup -p $PWD/NAARC_RUNS  -r $PWD/NAARC -n 4.2.2 -x 2 -m anemone -a impi -c ifort
cd NAARC_RUNS/nemo/cfgs/NAARC//
cp -rP EXPREF EXP_MYRUN
cd EXP_MYRUN
ln -s ../INPUTS/domain_cfg_mes.nc domain_cfg.nc

cd NAARC

./NAARC/scripts/setup/NAARC_setup -p $PWD/NAARC_RUNS  -r $PWD/NAARC -n 4.2.2 -x 2 -m archer2 -a mpich -c gnu
cd NAARC_RUNS/nemo/cfgs/NAARC/
cp -rP EXPREF EXP_MYRUN
cd EXP_MYRUN
ln -s ../INPUTS/domain_cfg_mes.nc domain_cfg.nc

In the case of -m archer2 one can also complile with -c cray.

Running An Experiment

Edit the project code and options in runscript.slurm then:

sbatch runscript.slurm -y 1979 -s 1

This will produce a 5 day mean output from the beginning of 1979. The run should take 15 minutes to complete once in the machine. To extend this to a full year's simulation, edit the runscript.slurm file and change:

   nn_itend    =    8928   !  last  time step (std 5840)
!  nn_itend    =    XXX_TEN_XXX   !  last  time step (std 5840)
to 
!  nn_itend    =    8928   !  last  time step (std 5840)
   nn_itend    =    XXX_TEN_XXX   !  last  time step (std 5840)

Forcing data:

NAARC

this is automatically transferred when the setup script is executed

For ARCHER2 users these data are held under /work/n01/shared/NAARC and /work/n01/shared/nemo/FORCING and are linked during the setup.