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ERA40 T85 Analysis Fields on Pressure Surfaces, created at NCAR
Entry ID: NCAR_DS124.1

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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

Link: VIEW RELATED INFORMATION
Description: ECMWF's ERA40 web site

Geographic Coverage

N: 88.928 S: -88.928 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

Science Keywords

ATMOSPHERE >AIR QUALITY >TROPOSPHERIC OZONE    [Definition]

ATMOSPHERE >ATMOSPHERIC TEMPERATURE >AIR TEMPERATURE    [Definition]

ATMOSPHERE >ATMOSPHERIC WATER VAPOR >HUMIDITY    [Definition]

ATMOSPHERE >ATMOSPHERIC WINDS >CONVERGENCE/DIVERGENCE    [Definition]

ATMOSPHERE >ATMOSPHERIC WINDS >UPPER LEVEL WINDS    [Definition]

ATMOSPHERE >ATMOSPHERIC WINDS >VERTICAL WIND MOTION    [Definition]

ATMOSPHERE >ATMOSPHERIC WINDS >VORTICITY    [Definition]

ISO Topic Category

CLIMATOLOGY/METEOROLOGY/ATMOSPHERE

Project

ESIP >Earth Science Information Partners Program [Information]

ERA40 >ECMWF ERA40 Reanalysis Project [Information]

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.

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 [Information]
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

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