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Dataset

 
Update Frequency: Not Planned
Status: Completed
Online Status: ONLINE
Publication State: Published
Publication Date: 2006-12-10
Download Stats: last 12 months

Abstract

The European Centre for Medium-Range Weather Forecasts (ECMWF) has provided global atmospheric analyses from its archive for many years. The ERA-15 Re-analysis project was devised in response to wishes expressed by many users for a data set generated by a modern, consistent, and invariant data assimilation system. The ERA-15 project produced a long time-series (January 1979 - February 1994) of consistent meteorological analyses using a single version of the ECMWF model.

This dataset contains surface orography data. These data are available in gaussian N80 gridded, lat-long (2.5 degree) gridded and spectral form, from the initialised and uninitialised datasets (N.B. initialised spectral is missing at the moment).

Note that the grid-point orography files change with date. This does not affect the ERA period but if you use Operational data for later dates you will need
to use the different orography files from our ecmwf-op directory.

The spectral orography file spor90010100 contains just the orography data (surface geopotential).

The other files contain the constant fields:
Geopotential (at the surface, orography)
Standard deviation of orography
Anisotropy of subgrid scale orography
Angle of subgrid scale orography
Slope of subgrid scale orography
Land/Sea mask

gpor79010100 contains the gaussian gridded data
llor80010100 contains the 2.5 degree gridded data

Citable as:  European Centre for Medium-Range Weather Forecasts (2006): ECMWF ERA-15: Surface Orography Data. NCAS British Atmospheric Data Centre, date of citation. https://catalogue.ceda.ac.uk/uuid/0872cfcf994b4c6292e19f69fb0e7541
Abbreviation: Not defined
Keywords: ECMWF, ERA, ERA 15, reanalysis, surface, orography

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 were extracted from European Centre for Medium-Range Weather Forecasts (ECMWF) MARS system and transferred to BADC where they were ingested into the archive.

Data Quality:
See http://www.ecmwf.int/products/data/technical/deficiencies/era15.html for details of known issues with the ERA-15 dataset. Note: for file giua81111712 the GRIB messages (i.e. q at level 22) was corrupted and so that message was replaced with one from the day before to enable users' scripts to run utilising the contents of the directory
File Format:
Data are GRIB 1 formatted.

Process overview

This dataset was generated by the computation detailed below.
Title ERA-15 data assimilation system deployed on ECMWF Computer
Abstract This computation involved: ERA-15 data assimilation system deployed on ECMWF Computer. The aim of the ECMWF Re-Analysis (ERA) project was to produce a long time-series of consistent meteorological analyses using a single version of the ECMWF model.
Input Description None
Output Description None
Software Reference None
  • long_name: Albedo
  • gcmd_url: http://vocab.ndg.nerc.ac.uk/term/P041/4/G199
  • gcmd_keyword: EARTH SCIENCE > Atmosphere > Atmospheric Radiation > Albedo
  • names: EARTH SCIENCE > Atmosphere > Atmospheric Radiation > Albedo, http://vocab.ndg.nerc.ac.uk/term/P041/4/G199
  • long_name: Angle Of Sub Grid Scaleorography
  • names: Angle Of Sub Grid Scaleorography
  • long_name: Anisotropy Of Sub Grid Scale Orography
  • names: Anisotropy Of Sub Grid Scale Orography
  • long_name: Geopotential (At The Surface, Orography)
  • names: Geopotential (At The Surface, Orography)
  • long_name: Land
  • names: Land
  • long_name: Landforms
  • gcmd_url: http://vocab.ndg.nerc.ac.uk/term/P041/4/G793
  • gcmd_keyword: EARTH SCIENCE > Land Surface > Topography > Landforms
  • names: http://vocab.ndg.nerc.ac.uk/term/P041/4/G793, EARTH SCIENCE > Land Surface > Topography > Landforms
  • long_name: Logarithm Of Surface Roughness Length For Heat
  • names: Logarithm Of Surface Roughness Length For Heat
  • long_name: Percentage Of Vegetation
  • names: Percentage Of Vegetation
  • long_name: Sea Mask
  • names: Sea Mask
  • long_name: Slope Of Sub-Grid Scale Orography
  • names: Slope Of Sub-Grid Scale Orography
  • long_name: Standard Deviation Of Orography
  • names: Standard Deviation Of Orography
  • long_name: Surface Roughness
  • gcmd_url: http://vocab.ndg.nerc.ac.uk/term/P141/4/GVAR0851
  • gcmd_keyword: Surface Roughness
  • names: Surface Roughness, http://vocab.ndg.nerc.ac.uk/term/P141/4/GVAR0851
  • long_name: Thermal Properties
  • gcmd_url: http://vocab.ndg.nerc.ac.uk/term/P141/4/GVAR0868
  • gcmd_keyword: Thermal Properties
  • names: http://vocab.ndg.nerc.ac.uk/term/P141/4/GVAR0868, Thermal Properties

Co-ordinate Variables

Coverage
Temporal Range
Start time:
1979-01-01T00:00:00
End time:
1994-02-28T00:00:00
Geographic Extent

 
90.0000°
 
-180.0000°
 
180.0000°
 
-90.0000°