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ERA40 T85 Monthly Mean Analysis Fields on Model Levels, created at NCAR
Entry ID: NCAR_DS126.2

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Summary

Abstract: DS126.2 represents a dataset implemented and computed by NCAR's Data Support Section, and forms an essential part of efforts undertaken in late 2004, early 2005, to produce an archive of selected segments of ERA-40 on a standard transformation grid. In this case, ERA-40 monthly mean upper air variables (designated as MODA or moda below) on 60 model levels were transformed from either spherical harmonics (surface geopotential, temperature, vertical pressure velocity, vorticity, logarithm of surface pressure, divergence), or a reduced N80 Gaussian grid (specific humidity, ozone mass mixing ratio, cloud liquid water content, cloud ice water content, cloud cover), to a 256x128 regular Gaussian grid at T85 spectral truncation. In addition, horizontal wind components were derived from spectral vorticity and divergence and also archived on a T85 Gaussian grid. All scalar fields were transformed using routines from the ECMWF EMOS library, whereas the horizontal winds were obtained using NCAR's Spherepack library. All corresponding 00Z, 06Z, 12Z, and 18Z monthly mean upper air variables on 60 model levels were also transformed to a T85 Gaussian grid (designated as MNLY, mnly, or mnth below). 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). 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

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 Monthly Mean Analysis Fields on Model Levels, 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/ds126.2/

Temporal Coverage

Start Date: 1957-09-01

Stop Date: 2002-08-31

Data Resolution
Latitude Resolution: 1.375 degrees
Longitude Resolution: 1.4 degrees

Science Keywords

ATMOSPHERE >AIR QUALITY >TROPOSPHERIC OZONE    [Definition]

ATMOSPHERE >ATMOSPHERIC PRESSURE >SURFACE PRESSURE    [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]

ATMOSPHERE >CLOUDS >CLOUD PROPERTIES >CLOUD FREQUENCY    [Definition]

ATMOSPHERE >CLOUDS >CLOUD MICROPHYSICS >CLOUD LIQUID WATER/ICE    [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: 126.2

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: 113.055 Gbytes

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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