ERA5 is a climate reanalysis dataset, covering the period 1950 to present. ERA5 is being developed through the Copernicus Climate Change Service (C3S).
Data processing for ERA5 is carried out by ECMWF, using ECMWFS' Earth System model IFS, cycle 41r2. The name ERA refers to 'ECMWF ReAnalysis', with ERA5 being the fifth major global reanalysis produced by ECMWF (after FGGE, ERA-15, ERA-40, ERA-Interim). The next reanalysis, ERA6, is planned for around 2020.

We are providing a small subset of ERA5 while waiting for a longer term solution to store and manage this big dataset.
Currently data is available from 2008 to present.
ERA5 comprises different data stream, we have only a small subset of the surface operative analysis. For the moment we are not considering downloading model or pressure level data as the size of these are quite big and we wouldn't be able to provide enough data to use them to run a model.
For more information on ERA5 data refer to the ECMWF website.

If you need other variables for your current research then you can contact us at climate_help@nci.org.au

NB this is a temporary fix so we will download only variables which are useful for a variety of projects and that are needed now, if you can use ERA-Interim instead or you will be using ERA5 in the future but not in the next few months, then we won't consider your request.


Known Issues

Known issues from ECMWF website

License

ERA5 data is open access and free to download for all uses, including commercial use.
As for ERAI and other ECMWF datasets, though, you need to have an account with ECMWF and accept their terms and conditions, in this particular case ERA5 is covered by the Copernicus license

ERA5 on raijin

Data is downloaded as grib on a regular 0.3x0.3 longitude/latitude grid at 1 hr resolution. These are the maximum spatial and temporal resolutions possible for this dataset.
The grib files are in

/g/data/ub4/era5/grib/<stream>/<variable>/<yr>/<files>

where <stream> currently is

oper_an_sfc --> operative analysis surface
oper_fc_sfc --> operative forecast surface

filename:
<var>_era5_<stream>_03x03_90N0E90S35970E_<from-date>_<to-date>

For example:
10U_era5_oper_an_sfc_03x03_90N0E90S35970E_20080101_20080131


Files are then converted to netcdf applying CF convention and partly CMOR conventions to allowed for this to be more easily used with a variety of software.

Currently the netcdf are in

/g/data/ub4/era5/netcdf/1hr/<realm>/<stream>/v01/<cmip-variable>/<files>

filename:
<var>_1hr_reanalysis_IFS-Cy41r2_<stream>_<from-date>_<to-date>.nc

For example:
psl_1hr_reanalysis_IFS-Cy41r2_an-sfc_20121201_20121231.nc

This is temporary and both filenames and directory structure might chnage in the near future, including attributes in the files.

Variable list with ECMWF/CMIP names (where available) i.e. grib/netcdf names

10U /uas - analysis 10 m wind eastward component
10V /vas - analysis 10 m wind northward component
MSL/psl -analysis mean sea level pressure
TP/ forecast total precipitation

Note on forecasts

Forecasts are accumulated values defined at 20 steps (0-19) starting from times 06.00 and 18.00.

The accumulations are over the hour ending at the forecast step which is a different behaviour from era interim.
The 0 step is always zero because it would be the accumulation from timestep and timestep +0 hours (I.e. 06.00 to 06.00)

The others would be for example for precipitation:
Time 06.00 Step 1: forecast of accumulated precipitation between 06.00-07.00
Time 06.00 Step 19: forecast of accumulated precipitation between 06.00-01.00+1 day