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 September 1957 to August 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://rda.ucar.edu/cgi-bin/joey/era40sum.pl?ds=ds118.1]. 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 256 by 128 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 four times per day (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.cesm.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 4DVAR (as opposed to 3DVAR in ERA-40). ECMWF will continue to run the ERA-Interim model in near real time through at least 2010, and possibly longer. This data is available in ds627.0 [http://rda.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://rda.ucar.edu/datasets/ds124.1/


Temporal Coverage
Start Date: 1957-09-01
Stop Date: 2002-08-31


Science Keywords
ATMOSPHERE >ATMOSPHERIC WINDS >VORTICITY    [Definition]
ATMOSPHERE >ATMOSPHERIC WINDS >CONVERGENCE/DIVERGENCE    [Definition]
ATMOSPHERE >AIR QUALITY >TROPOSPHERIC OZONE    [Definition]
ATMOSPHERE >ATMOSPHERIC WINDS >VERTICAL WIND MOTION    [Definition]
ATMOSPHERE >ATMOSPHERIC WATER VAPOR >HUMIDITY    [Definition]
ATMOSPHERE >ATMOSPHERIC TEMPERATURE >SURFACE TEMPERATURE >AIR TEMPERATURE    [Definition]
ATMOSPHERE >ATMOSPHERIC WINDS >UPPER LEVEL WINDS    [Definition]


ISO Topic Category
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE


Project
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
MODELS
ERA40DAS > ERA40 Data Assimilation System


Data Set Progress
COMPLETE


Data Center
Research Data Archive, 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: rdahelp 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: 2015-03-05

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