NorCPM User Manual

PLEASE READ THIS BEFORE EDITING

Ingo Bethke Francois Counillon enter your name here (alphabetical order)

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).

NorESM configurations in NorCPM

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

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

1. If you have a NoreSM svn access do:

svn checkout https://svn.met.no/NorESM/noresm/tags/projectEPOCASA-3 projectEPOCASA-3

1. if you don't do:

tar xvf /work-common/shared/nn9039k/NorCPM/Code/NorESM/projectEPOCASA-3.tar.gz mkdir -p Script

1. 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

1. Same with bin, I would recommend linking the executable for now. If you want to create your own,
2. Copy and compile the code in /work-common/shared/nn9039k/NorCPM/Code/EnKF/
3. 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