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Dataset

 

ECMWF ERA5t: 10 ensemble member surface level analysis parameter data

Update Frequency: Daily
Status: Ongoing
Online Status: ONLINE
Publication State: Published
Publication Date: 2022-03-22
Download Stats: last 12 months

Abstract

This dataset contains ERA5 initial release (ERA5t) surface level analysis parameter data from 10 member ensemble runs. ERA5t is the European Centre for Medium-Range Weather Forecasts (ECWMF) ERA5 reanalysis project initial release available upto 5 days behind the present data. CEDA will maintain a 6 month rolling archive of these data with overlap to the verified ERA5 data - see linked datasets on this record. Ensemble means and spreads were calculated from the ERA5t 10 member ensemble, run at a reduced resolution compared with the single high resolution (hourly output at 31 km grid spacing) 'HRES' realisation, for which these data have been produced to provide an uncertainty estimate. This dataset contains a limited selection of all available variables and have been converted to netCDF from the original GRIB files held on the ECMWF system. They have also been translated onto a regular latitude-longitude grid during the extraction process from the ECMWF holdings. For a fuller set of variables please see the linked Copernicus Data Store (CDS) data tool, linked to from this record. See linked datasets for ensemble member and spread data.

Note, ensemble standard deviation is often referred to as ensemble spread and is calculated as the standard deviation of the 10-members in the ensemble (i.e., including the control). It is not the sample standard deviation, and thus were calculated by dividing by 10 rather than 9 (N-1). See linked datasets for ensemble mean and ensemble spread data.

The ERA5 global atmospheric reanalysis of the covers 1979 to 2 months behind the present month. This follows on from the ERA-15, ERA-40 rand ERA-interim re-analysis projects. An initial release of ERA5 data (ERA5t) is made roughly 5 days behind the present date. These will be subsequently reviewed and, if required, amended before the full ERA5 release. CEDA holds a 6 month rolling copy of the latest ERA5t data. See related datasets linked to from this record.

Citable as:  European Centre for Medium-Range Weather Forecasts (2022): ECMWF ERA5t: 10 ensemble member surface level analysis parameter data. Centre for Environmental Data Analysis, date of citation. https://catalogue.ceda.ac.uk/uuid/f2f0bc7b9d0344babea9e800d9b71535
Abbreviation: Not defined
Keywords: ECMWF, ERA, ERA5, reanalysis, analysis, surface level, ensemble runs

Details

Previous Info:
No news update for this record
Previously used record identifiers:
No related previous identifiers.
Access rules:
Access to these data is available to any registered CEDA user. Please Login or Register for an account to gain access.
Use of these data is covered by the following licence: http://licences.ceda.ac.uk/image/data_access_condition/ecmwf-era-products.pdf. When using these data you must cite them correctly using the citation given on the CEDA Data Catalogue record.
Data lineage:

Data are generated by the ERA5 project at European Centre for Medium-Range Weather Forecasts (ECMWF) before being prepared by CEDA staff using the ECMWF system and uploaded to Centre for Environmental Data Analysis (CEDA) for ingestion into the archive. Data are translated over to a regular latitude-longitude grid and converted to netCDF format ahead of transfer to the CEDA system.

Data Quality:
ECMWF quality controlled data.
File Format:
Data are netCDF formatted with internal compression.

Process overview

This dataset was generated by the computation detailed below.
Title ECMWF ERA5 Re-analysis Model deployed on ECMWF Computer
Abstract This computation involved: ECMWF ERA5 Re-analysis Model deployed on ECMWF Computer. The data assimilation system used to produce ERA5 is based on the Integrated Forecasting System (IFS)Cycle 41r2 release, with several added features specifically developed for reanalysis. The many changes and improvements incorporated into the IFS represent a decade of research and development in modelling and data assimilation. The ERA5 reanalysis benefits from research conducted in the EU-funded ERA-CLIM and ERA-CLIM2 projects carried out by ECMWF and partners. These led to improved input data for the assimilating model that better reflects observed changes in climate forcings, as well as many new or reprocessed observations for data assimilation. The system includes : - Model input: Appropriate for climate (e.g. CMIP5 greenhouse gases, volcanic eruptions, SST and sea-ice cover) - Spatial resolution: 31 km globally, 137 levels to 0.01 hPa - Uncertainty estimates - From a 10-member Ensemble of Data Assimilations (EDA) at 63 km resolution - Output frequency: Hourly analysis and forecast fields, 3-hourly for the EDA - Input observations: As in ERA-40 and from Global Telecommunication System. In addition, various newly reprocessed datasets and recent instruments that could not be ingested in ERA-Interim - Variational bias scheme: Satellite radiances and also ozone, aircraft and surface pressure data - Satellite data: RTTOV-11, all-sky for various components - Additional innovations: Long-term evolution of CO2 in RTTOV, cell-pressure correction SSU, improved bias correction for radiosondes, EDA perturbations for sea-ice cover
Input Description None
Output Description None
Software Reference None
  • units: m s**-1
  • long_name: 10 metre U wind component
  • var_id: u10
  • names: 10 metre U wind component
  • units: m s**-1
  • long_name: 10 metre V wind component
  • var_id: v10
  • names: 10 metre V wind component
  • units: K
  • long_name: 2 metre dewpoint temperature
  • var_id: d2m
  • names: 2 metre dewpoint temperature
  • units: K
  • long_name: 2 metre temperature
  • var_id: t2m
  • names: 2 metre temperature
  • units: Pa
  • var_id: msl
  • long_name: Mean sea level pressure
  • standard_name: air_pressure_at_mean_sea_level
  • names: Mean sea level pressure, air_pressure_at_mean_sea_level
  • standard_name: sea_ice_area_fraction
  • units: (0 - 1)
  • long_name: Sea ice area fraction
  • var_id: siconc
  • names: sea_ice_area_fraction, Sea ice area fraction
  • units: K
  • var_id: sst
  • long_name: Sea surface temperature
  • names: Sea surface temperature
  • units: K
  • long_name: Skin temperature
  • var_id: skt
  • names: Skin temperature
  • standard_name: cloud_area_fraction
  • units: (0 - 1)
  • long_name: Total cloud cover
  • var_id: tcc
  • names: cloud_area_fraction, Total cloud cover
  • units: kg m**-2
  • long_name: Total column water vapour
  • var_id: tcwv
  • standard_name: lwe_thickness_of_atmosphere_mass_content_of_water_vapor
  • names: Total column water vapour, lwe_thickness_of_atmosphere_mass_content_of_water_vapor
  • units: degrees_north
  • var_id: latitude
  • long_name: latitude
  • names: latitude
  • units: degrees_east
  • var_id: longitude
  • long_name: longitude
  • names: longitude
  • long_name: time
  • var_id: time
  • names: time

Co-ordinate Variables

Coverage
Temporal Range
Start time:
2021-09-01T00:00:00
End time:
Ongoing
Geographic Extent

 
90.0000°
 
-180.0000°
 
180.0000°
 
-90.0000°