CT1 Data Collection
Model Data collection and analysis of CT1 "Quantifying and modeling THC variability using palaeoclimate observations and simulations" are coordinated by IfM-GEOMAR, Kiel. The initiative of the Kiel group is to coordinate analysis of Atlantic Multi-decadal variability (AMV) in AOGCMs. The main aim of this analysis is to identify the key process that give rise to the wide variety of simulated AMV among these models. It may serve as the first step towards constraining the mechanisms for AMV and important in relation to on going decadal prediction efforts.
Link (will be available soon)
Contact person:
Noel Keenlyside
Tel. +49-431-600 40 54
nkeenlyside(at)ifm-geomar.de
Requested Data
Initially only the two-dimensional are requested. Three-dimensional data are required for only a few of the above analysis (budgets, and overflow calculations). These will be requested at a later stage, after determining a suitable temporal and spatial resolution for the planned analysis.
Requirements:
Type of experiment: control simulations (present day or preindustrial)
Data length: a minimum of 1000 years is requested for all data. SST and Atlantic overturning stream function are requested for the entire simulation to assess stationary of variability
Format: preferably NETCDF, but other formats possible
Grid: on the original model grid, with relevant information provided.
Vertical ocean resolution: limited levels
Constant fields
Model grids
3D land-sea mask
Requested variables
Two-dimensional monthly mean fields
- Atlantic meridional overturning stream function
- Global overturning stream function
- Barotropic streamfunction
- Evaporation
- Geopotential height at 500 hPa
- Geopotential height at 200 hPa
- Latent, sensible, short wave and long wave heat fluxes
- Longwave radiation
- Meridional surface wind stress
- Mixed-layer thickness
- Net fresh water flux
- Net heat flux
- Advective flux of heat
- Advective flux of salt
- Northward heat transport
- Northward wind stress
- Eastward windstress
- Precipitation
- Runoff
- Sea ice fraction
- Sea ice thickness
- Sea level pressure
- Sea surface temperature
- Sea surface salinity
- Solar radiation
- Thermocline depth
- Zonal surface wind stress
- Surface air temperature
Three-dimensional monthly mean data
- Potential Temperature
- Salinity
- Eastward Sea Water Velocity
- Northward Sea Water Velocity
- Density
Table of Models
Model | Institute | Length of run (yrs) |
BCM | NERSC, Bergen | 700 |
ECHAM5/MPIOM | MPI-M, Hamburg | 1000+ |
ECHAM5/MPIOM | IfM-GEOMAR, Kiel | 500 to be extended |
ECHAM5/NEMO | IfM-GEOMAR, Kiel | 4000+ |
HadCM3 | MET O, UK | 4800 |
HadGEM1 | MET O, UK | 1100 |
IPSL | UPMC-LOCEAN, Paris | 1000 |
Data Exchange
The following sftp site is available for data sharing:
amv@hanuma.ifm-geomar.de
The site can be accessed only with sftp (command description below) from any machine whose ssh public key has been included in the list of authorised keys. To create the public key type
ssh-keygen -t rsa -b 2048
then choose a (secure) password and confirm it. Now two files will be created (by default usually in the directory $HOME/.ssh): id_rsa and id_rsa.pub. When this is done, please send a copy of the public key id_rsa.pub to Jin Ba (jba@ifm-geomar.de).
The directory structure is organised as follows, where model is the appropriate acrony
/data/model Please store here information on the data, including how to read it
/data/model/2D Directory for 2-dimensional fields
/data/model/CONSTANT Directory for constant fields
The command for interactive access to the sftp sites is as follows:
sftp -oPort=42686 amv@hanuma.ifm-geomar.de
Access is also possible in batch mode with the following command:
sftp -b my-sftp-commands -o Port=42686 amv@hanuma.ifm-geomar.de
Where my-sftp-commands is a text file listing the sftp commands, e.g.,
cd data put /path/to/local/file remote-file-name