Reanalysis datasets

Meteorological reanalysis data is produced by combining measurements, observations and simulation data by applying data assimilation techniques. These datasets are only available for historical time period and with a substantial delay of several weeks or months. meteoblue offers the following reanalysis datasets:

  • ERA5: A global dataset in 30 km resolution
  • BOM: Covers Australia in 5 km resolution

ERA5

Field Metadata
Title ERA5
Short Title ERA5
Version version 5, 2013
Theme weather, climate, reanalysis, model
Period of Time currently: 2000 to 2017; planned: 1980 to present
Frequency monthly / weekly
Update timelag 2 - 6 weeks
Time-resolution hourly
Spatial Type ECMWF N320 reduced Gaussian Grid
Spatial extend Global: 180W to 180E / 89.784S to 89.784N
Spatial resolution 30 km
Coordinate system WGS-84
Earth model WGS-84
Spatial reference system  
Publisher ECMWF
Date First Published 2013
Date Obsolete -
Description ERA5 was produced using 4DVar data assimilation in CY41R2 of ECMWF’s Integrated Forecast System (IFS), with 137 hybrid sigma / pressure (model) levels in the vertical, with the top level at 0.01 hPa. Atmospheric data are available on these levels and they are also interpolated to 37 pressure, 16 potential temperature and 1 potential vorticity level(s). "Surface or single level" data are also available, containing 2D parameters such as precipitation, 2 m temperature, top of atmosphere radiation and vertical integrals over the entire atmosphere. The IFS is coupled to a soil model, the parameters of which are also designated as surface parameters, and an ocean wave model. Improvements to ERA5, compared to ERA-Interim, include 30 km instead of 80 km spatial resolution, 1 h time resolution, use of HadISST.2, reprocessed ECMWF climate data records (CDR), and implementation of RTTOV11 radiative transfer. Variational bias corrections have not only been applied to satellite radiances, but also ozone retrievals, aircraft observations, surface pressure, and radiosonde profiles.
Detailed specification https://software.ecmwf.int/wiki/display/CKB/ERA5+data+documentation
Homepage URL https://software.ecmwf.int/wiki/display/CKB/What+is+ERA5 
Security Classification public
Access Level This licence is free of charge, worldwide, non-exclusive, royalty free and perpetual. Access to Copernicus Products is given for the purpose of the following use in so far as it is lawful: reproduction; distribution; communication to the public; adaptation, modification and combination with other data and information; or any combination of the foregoing.
License http://apps.ecmwf.int/datasets/licences/copernicus/

BOM

The BOM provides daily gridded climate data as interpolated observation data at a resolution of 0.05 degrees (approximately 5 km) covering entire Australia.

The following variables are available from BOM (and also incorporated into the meteoblue system):

  • Daily rainfall gridded data (daily precipitation sum) (1901 to present)
  • Daily gridded temperature data (max / min temperatures) (1911 to present)
  • Daily vapour pressure grids (daily 9 am and 3 pm) (1971 to present)
  • Daily total gridded global solar exposure data (1990 to present)

The data is gridded at a resolution of 0.05 degrees, however the information content is nowhere near this localized. The data was obtained by spatial interpolation of station observations and thus has resolutions as bad as hundreds of kilometres in certain areas. meteoblue did and will not alter the content of the original dataset (e.g. fill data gaps) in order to preserve the official character of the dataset.