Global Change Master Directory (GCMD)

Data Sets

Services / Tools

Ancillary Descriptions

Are you using a browser that doesn't support JavaScript or have you disabled JavaScript?

If you have disabled JavaScript, you must re-enable JavaScript to use this page.
Or you can view this record using the Text Only Format.

ERA40 T85 Analysis Fields on Pressure Surfaces, created at NCAR

Entry ID: NCAR_DS124.1

[ Update this Record ]

Summary

Abstract: The ECMWF Re-Analysis (ERA40) is a global atmospheric analysis of many conventional observations and satellite data streams for the period Sept,1957- Aug,2002. There are numerous data products that are separated into dataset series based on resolution, vertical coordinate reference, and likely research applications. Descriptions of the ... series organization and direct links to information about all ERA40 products are available [http://dss.ucar.edu/pub/era40]. DS124.1 represents a new data set implemented and computed by NCAR's Data Support Section, and forms a substantial part of ongoing efforts to produce an archive of selected segments of ERA-40 on a standard transformation grid. In this case, ERA-40 upper air variables on 23 pressure levels have been transformed from either spherical harmonics (geopotential, temperature, vertical pressure velocity, vorticity, divergence, relative humidity), or a reduced N80 Gaussian grid (potential vorticity, specific humidity, ozone mass mixing ratio), to a 256x128 regular Gaussian grid at T85 spectral truncation. In addition, horizontal wind components have been derived from spectral vorticity and divergence and also archived on a T85 Gaussian grid. All fields are available 4x daily (00,06,12 and 18 UTC). All scalar fields have been transformed using routines from the ECMWF EMOS library, whereas the horizontal winds have been obtained using NCAR's Spherepack library. The choice of a T85 Gaussian grid was based on considerations of limiting the volume of new data generated to a moderate level, and to match the horizontal resolution of the Community Atmosphere Model (CAM) [http://www.ccsm.ucar.edu/models/atm-cam/] component of NCAR's Community Climate System Model (CCSM). is available to registered users of DSS ERA-40 data. Users may select a set of variables, and designate pressure levels, and start and end dates, for each variable. Output, in GRIB or netCDF, can be retrieved via restricted ftp The ERA-Interim data from ECMWF is an update to the ERA-40 project. The ERA-Interim data starts in 1989 and has a higher horizontal resolution (T255, N128 nominally 0.703125 degrees) than the ERA-40 data (T159, N80 nominally 1.125 degrees). ERA-Interim is based on a more current model than ERA-40 and uses 4-D VAR (as apposed to 3-D VAR in ERA-40). ECMWF will continue to run the ERA-Interim model in near real time thru at least 2010, and possibly longer. This data is available in ds627.0 [http://dss.ucar.edu/datasets/ds627.0].

Related URL

Link: VIEW RELATED INFORMATION

Description: ECMWF's ERA40 web site

Geographic Coverage

(Click for Interactive Map)

Spatial coordinates

N: 88.93

S: -88.93

E: 180.0

W: -180.0

Data Set Citation

Dataset Originator/Creator: UCAR/NCAR/CISL/DSS > Data Support Section, Computational and Information Systems Laboratory, National Center for Atmospheric Research, University Corporation for Atmospheric Research

Dataset Title: ERA40 T85 Analysis Fields on Pressure Surfaces, created at NCAR

Dataset Publisher: UCAR/NCAR/CISL/DSS > Data Support Section, Computational and Information Systems Laboratory, National Center for Atmospheric Research, University Corporation for Atmospheric Research

Online Resource: http://dss.ucar.edu/datasets/ds124.1/

Temporal Coverage

Start Date: 1957-09-01

Stop Date: 2002-08-31

Data Resolution

Latitude Resolution: 1.406 degrees
Longitude Resolution: 1.4 degrees
Horizontal Resolution Range: 100 km - < 250 km or approximately 1 degree - < 2.5 degrees

Science Keywords

ATMOSPHERE > AIR QUALITY > TROPOSPHERIC OZONE

ATMOSPHERE > ATMOSPHERIC TEMPERATURE > AIR TEMPERATURE

ISO Topic Category

CLIMATOLOGY/METEOROLOGY/ATMOSPHERE

Project

ESIP > Earth Science Information Partners Program

ERA40 > ECMWF ERA40 Reanalysis Project

Access Constraints We are allowed to distribute this data to US scientists, scientists visiting US organizations, and Canadian scientists affiliated with UCAR member organizations only.

Use Constraints The data can be used for non-commercial research only.

Ancillary Keywords

ERA40DAS > ERA40 Data Assimilation System

Data Set Progress

COMPLETE

Data Center

Data Support Section, Computational and Information Systems Laboratory, National Center for Atmospheric Research, University Corporation for Atmospheric Research

Data Center URL: http://rda.ucar.edu/
Dataset ID: 124.1

Data Center Personnel
Name: RDA HELP DESK Phone: (303)-497-1231 Fax: (303)-497-1291 Email: dssweb at ucar.edu Contact Address: National Center for Atmospheric Research CISL/DSS P.O. Box 3000 City: Boulder Province or State: CO Postal Code: 80307 Country: U.S.A.

Distribution

Distribution Size: 1.093 Tbytes

Distribution Format: GRIB1 > GRIdded Binary form, Edition 1

Personnel

DAVE STEPANIAK

Role: TECHNICAL CONTACT

Phone: (303)-497-1343

Fax: (303)-497-1291

Email: davestep at ucar.edu

Contact Address:

National Center for Atmospheric Research

CISL/DSS

P.O. Box 3000

City: Boulder

Province or State: CO

Postal Code: 80307

Country: U.S.A.

BOB DATTORE

Role: DIF AUTHOR

Phone: (303)-497-1825

Fax: (303)-497-1291

Email: dattore at ucar.edu

Contact Address:

National Center for Atmospheric Research

CISL/DSS

P.O. Box 3000

City: Boulder

Province or State: CO

Postal Code: 80307

Country: U.S.A.

Creation and Review Dates

Last DIF Revision Date: 2011-01-24

Reformat as FGDC document

View Text Only Format

[ Update this Record ]