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CT1 Data Collection

Data exchange for CT1

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.

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

Three-dimensional monthly mean data

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@we dont want spamifm-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

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