NorCPM User Manual
PLEASE READ THIS BEFORE EDITING
Overview
The Norwegian Climate Prediction Model (NorCPM) is aiming at providing prediction from seasonal-to-decadal time scale. It is based on the Norwegian earth system model ([1]) and the Ensemble Kalman Filter ([2]) data assimilation method. NorESM is a state of the art Earth system model that is based on CESM ([3]), but that used different Aerosol/chemistry scheme and ocean model ( evolve from the MICOM). The EnKF is a sequential data assimilation method that allows for fully multivariate and flow dependent correct using the covariance matrix from a Monte-carlo model integration.
Norwegian Earth System Model
The Norwegian Earth System Model (NorESM) is one out of ~20 climate models that has produced output for the CMIP5 (http://cmip-pcmdi.llnl.gov/cmip5). The NorESM-family of models are based on the Community Climate System Model version 4 (CCSM4) of the University Corporation for Atmospheric Research, but differs from the latter by, in particular, an isopycnic coordinate ocean model and advanced chemistry-aerosol-cloud-radiation interaction schemes. The main version NorESM1-M has a horizontal resolution of approximately 2deg for the atmosphere and land components and 1deg for the ocean and ice components. NorESM is also available in a lower resolution version (NorESM1-L), a medium-low resolution version (NorESM1-ML), a high-top version with specified and full chemistry (NorESM1-MLHT and NorESM1-MLHTC) and a version that includes prognostic biogeochemical cycling (NorESM1-ME).
| Model acronym | Ocean | Atmosphere | References |
|---|---|---|---|
| NorESM1-L | Micom (3.6deg) | CAM4 (T31) | Zhang et al. 2012, Counillon et al. 2014 |
| NorESM1-ML | Micom (2deg) | CAM4 (2deg) | |
| NorESM1-MLHT | Micom (2deg) | CAM4-WACCMSC (2deg) | |
| NorESM1-MLHTC | Micom (2deg) | CAM4-WACCM (2deg) | |
| NorESM1-ME | Micom (1deg) | CAM4-OSLO (2deg) | Tjiputra et al. 2013 |
Ensemble Kalman Filter
Getting started with NorESM
Prerequisites
User-support for NorCPM is currently limited to Norway.
Step 1: New users need to apply for access to computational and storage resources at the Norwegian Metacenter for Computational Science (link to application page: https://www.notur.no/user-account). NorCPM activities are usually tied to the cpu and storage accounts nn9039k and ns9039k, which are held by Noel Keenlyside (noel.keenlyside[at]gfi.uib.no). NorCPM is currently set up on the computational platform HEXAGON (https://www.notur.no/hardware/hexagon).
Step 2: After gaining access to HEXAGON, the user needs to contact the local support (support-uib@notur.no) to be added to the unix-groups "noresm" and "nn9039k".
Obtaining and installing the model
To install NorCPM on your account, follow the step: 1) install NorESM and link the script necessary : cd ${HOME} mkdir -p NorESM cd NorESM
- If you have a NoreSM svn access do:
svn checkout https://svn.met.no/NorESM/noresm/tags/projectEPOCASA-3 projectEPOCASA-3
- if you don't do:
tar xvf /work-common/shared/nn9039k/NorCPM/Code/NorESM/projectEPOCASA-3.tar.gz mkdir -p Script
- Now you will use the default Script version
ln -s /work/shared/nn9039k/NorCPM/Script/* . rm personal_setting.sh cp /work/shared/nn9039k/NorCPM/Script/personal_setting.sh . cd ${HOME}/NorESM/ mkdir -p bin cd bin
- Same with bin, I would recommend linking the executable for now. If you want to create your own,
- Copy and compile the code in /work-common/shared/nn9039k/NorCPM/Code/EnKF/
- delete the link in bin and move your own executable there
ln -sf /work/shared/nn9039k/NorCPM/bin/* .
2) Select of a model version and experiment : Need to edit ${HOME}/Script/personal_setting.sh to chose a model version, ensemble size, starting date, ... Launch the creation of the ensemble structure. cd ${HOME}/NorESM/Script ./create_ensemble.sh