#NSSS 6TH EDITION FREE PDF ARCHIVE#

The final ERA5 back extension 1940-1978 is being produced and the period for 1959-1978 has been released already. The main entry currently contains data from 1959 onwards. This dataset is available as a separate entry in the CDS catalogue (and in MARS) for a short period of time, after which it will be deprecated and replaced by a new updated version which will be accessible through the main ERA5 entry. In order to speed up production, ERA5 is produced by running several parallel 'streams' or experiments, which are then spliced together to form the published version.ĮRA5.1 is a re-run of ERA5, for the years 2000 to 2006 only, and was produced to improve upon the cold bias in the lower stratosphere seen in ERA5 during this period.Īn ERA5 back extension 1950-1978 (Preliminary version) has been produced. Although in many other respects the quality is relatively good, this preliminary data does suffer from excessively intense tropical cyclones. On the CDS disks, where single level and pressure level data are available, analyses are provided rather than forecasts, unless the parameter is only available from the forecasts.

#NSSS 6TH EDITION FREE PDF ARCHIVE#

The data are archived in the ECMWF data archive (MARS) and a pertinent sub-set of the data, interpolated to a regular latitude/longitude grid, has been copied to the C3S Climate Data Store ( CDS) disks. mean rates/fluxes and accumulations, that are not available from the analyses. However, there are a number of forecast parameters, e.g. Most analysed parameters are also available from the forecasts. Generally, the data are available at a sub-daily and monthly frequency and consist of analyses and short (18 hour) forecasts, initialised twice daily from analyses at 06 and 18 UTC. The ensemble is required for the data assimilation procedure, but as a by-product also provides an estimate of the relative, random uncertainty. The ERA5 dataset contains one (hourly, 31 km) high resolution realisation (referred to as 'reanalysis' or 'HRES') and a reduced resolution ten member ensemble (referred to as 'ensemble' or 'EDA').

The atmospheric model in the IFS is coupled to a land-surface model (HTESSEL), which produces parameters such as 2m temperature and soil temperatures, and an ocean wave model (WAM), the parameters of which are also designated as surface or single level parameters. 'Surface or single level' data are also available, containing 2D parameters such as precipitation, top of atmosphere radiation and vertical integrals over the entire depth of the atmosphere.

Atmospheric data are available on these levels and they are also interpolated to 37 pressure, 16 potential temperature and 1 potential vorticity level(s) by FULL-POS in the IFS. For up to date information on ERA5, please consult the C3S Announcements on the Copernicus user forum.ĮRA5 is produced using 4D-Var data assimilation and model forecasts in CY41R2 of the ECMWF Integrated Forecast System (IFS), with 137 hybrid sigma/pressure (model) levels in the vertical and the top level at 0.01 hPa. Complete ERA5 data released so far covers the period from 1959 and continues to be extended forward in near real time. Here we document the ERA5 dataset, which, eventually, will cover the period from January 1940 onwards.

Nsss 6th edition free pdf