: Model Data
: HadCM3 Data
SO&P: HadCM3 Sea surface temperature
all : 1750-1999 all forcings
Important notes regarding the HadCM3 data:
- Do not redistribute data to others outside the SO&P project.
- Hadley Centre will require co-authorship and need to know from the start
what analyses you are using the HadCM3 data for. Please contact
Simon Tett (see SO&P
participants table) and keep him informed.
- To ensure collaboration between SO&P partners, please refer to the
list of ongoing/planned model-data
comparisons. Please contact
others who have listed an interest in the same area, to initiate
collaboration. To add your planned areas of model-data work to the list,
email Tim Osborn.
- A small climate drift, unrelated to the external forcings, is present
in the HadCM3 simulations. It's significance depends on the region and
variable being considered. Simon Tett describes how this should be dealt
with, by reference to the HadCM3 control simulation, in this report (not yet
available). The HadCM3 control simulation data is not yet available.
- Please inform Tim Osborn
of any errors that you find in the data.
For important notes regarding the
Obtaining fields of model data
Fields of model data, covering the entire globe, are available in netCDF
format only (please email Tim Osborn
if you cannot use netCDF files). For monthly and seasonal-mean data, there
is usually one file for each decade (though not always and the filenames or
headers will make it clear when this is not the case). For annual data
there are usually separate files for each year.
The netCDF header contains all the information
about coordinates and units that you need.
You have two options for downloading the files:
Note that the data files use the HadCM3 variable name instead of the
variable name used on the SO&P website. Instead of
sst__, the files are named
- Use wget with the command listed below
to obtain the wget software, to understand its options and for an explanation of its advantages):
wget --mirror --no-parent --no-directories --accept=nc --http-user=soaphad --http-passwd=xe2005 http://www.cru.uea.ac.uk/cru/projects/soap/pw/data/model/hadcm3/soaparchive/all/nc/SST/
- Click here
to see a listing of all files, and right-click each one that you want to download/save.
Note also that the units used in the data files may be different to those given
in the time series plots/data, because I converted some variables to more common units.
Refer to the netCDF file headers for the units used (and any notes below regarding
errors in this information).
Select alternative simulation for this variable:
Select alternative variable from this simulation:
Important notes regarding the 'all' simulation:
- The vegetation cover was incorrectly set to present-day, rather
than pre-industrial, during the 'nat' simulation.
The 'all' simulation should start smoothly from the 'nat'
1750, but because of the sudden change from present-day to 1750 vegetation
there is a step-change between the two simulations.
Simon Tett will be calculating some correction fields for
each variable, which can be applied to the 'nat' simulation data
to remove the vegetation error effects.
- The stratospheric ozone depletion used as a forcing in the 'all'
simulation was too strong by a factor of around 2. This may affect some
variables (e.g. Antarctic atmospheric circulation) in the final 3 decades
of the simulation. Simon Tett is considering a re-run of these final
Last updated: August 2004, Tim Osborn