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ERA40 T106 Analysis Fields on Pressure Surfaces, created at NCAR

DS127.1 represents a higher resolution version of ds124.1. Both ds124.1 and 127.1 were implemented and computed by NCAR's Data Support Section, and form 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 the case of ds127.1, ERA-40 6-hourly upper air variables on 23 pressure levels were 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 320x160 regular Gaussian grid at T106 spectral truncation. In addition, horizontal wind components were derived from spectral vorticity and divergence and also archived on a T106 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.

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.



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PERIODS: 1957-09-01 00:00 +0000 to 2002-08-31 18:00 +0000
ACCESS:

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

USAGE:

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

VARIABLES:
Air TemperatureConvergence/DivergenceHumidityTropospheric Ozone
Upper Level WindsVertical Wind MotionVorticity 

GRIB parameter table
LEVELS: See the detailed metadata for level information
TYPES: Grid
COVERAGE: Longitude Range: Westernmost=180W Easternmost=180E
Latitude Range: Southernmost=89.142S Northernmost=89.142N
Detailed coverage information
SOURCES: UCAR/NCAR/CISL/DSS
Data Support Section, Computational and Information Systems Laboratory, National Center for Atmospheric Research, University Corporation for Atmospheric Research
ECMWF
European Centre for Medium-Range Weather Forecasts
RELATED SITES: ECMWF's ERA40 web site
PUBLICATIONS: ERA40 Report Series
Recommended acknowledgement for this dataset:
"The data for this study are from the Research Data Archive (RDA) which is maintained by the Computational and Information Systems Laboratory (CISL) at the National Center for Atmospheric Research (NCAR). NCAR is sponsored by the National Science Foundation (NSF). The original data are available from the RDA (http://dss.ucar.edu) in dataset number ds127.1."
VOLUME: 1706.29 GBytes
DATA FORMATS: WMO GRIB1
RELATED DATASETS: ds627.0 - ERA-Interim Project

MORE DETAILS: View more details for this dataset, including dataset citation, data contributors, and other detailed metadata
CONTACT: For assistance with this dataset, please contact Dave Stepaniak (303-497-1343) . If the specialist is unavailable, please contact Data Help.
DATA ACCESS: Click the tab here or in the navigation bar at the top of the page.
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