ERA-40 on T85

Dear CCSM users,

Below is an announcement of an ERA-40 dataset on T85 Gaussian grid.
You only need to read on if such a dataset is relevant to your work.

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The Data Support Section (DSS) of SCD announces the first of a new series of datasets, DS124.1, which forms a substantial part of ongoing efforts by DSS to produce an archive of selected segments of ERA-40 on a standard transformation grid. The DS124.1 web page can be viewed at,

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

In this case, ERA-40 upper air variables on 23 pressure levels at 6- hourly resolution 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 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 resolution of the latest generation of CCSM, NCAR's Community Climate System Model. The data format is ECMWF GRIB (Edition 1, Local Table 2, Version 128). Present data access is via NCAR's MSS only. Future access may include high performance RAID systems and technology connected to NCAR's supercomputing network, and on-line web access as for other DSS ERA-40 datasets.

Questions concerning DS124.1 should be directed to Dave Stepaniak (davestep@ucar.edu).

Presently, ERA-40 upper air variables on 60 model levels at 6-hourly resolution are also being transformed to a T85 grid, including computation of horizontal winds. Thereafter, high resolution 6-hourly surface variables will be transformed to a T85 grid, and, if time permits, the monthly mean analogs of the 6-hourly upper air pressure and model level variables, and 6-hourly surface variables, will be archived at T85 resolution. Announcements via the ccsm-participants mailing list will be made as these latter datasets are officially released. For more general information on the NCAR ERA-40 archive, including available products, software options and other announcements, please see http://dss.ucar.edu/pub/era40

Steven Worley, Joey Comeaux, and Dave Stepaniak NCAR/SCD/DSS

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