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MM5 Data Ingestion
Wei Wang of MMM informs us to look here:
How to Get Data
for a description of the NCAR datasets that may be used in the MM5. This includes
these DSS datasets:
NCEP Global Analyses "FNL" (DS082.0, DS083.0. and DS083.2.)
NCEP ADP Observational data (DS353.1, DS353.4 and DS464.0).
ECMWF TOGA Analyses (DS111.2)
NCAR/NCEP Reanalysis Project "NNRP" (DS090.0)
ECMWF Reanalysis Analyses "ERA" (DS115.0)
GCIP NCEP Eta model output "AWIP" (DS609.2)
Some users have used Navy SST data, but only special reformatted versions
of Navy SST, available from MMM, can be used. It is not necessary to use
Navy SST and it was used mainly to fill gaps in other sets.
April 1998 - MM5 was modified to ingest data in GRIB format directly. This
should work with both NCEP operational and Reanalysis data.
Users who want to run the model on non-Cray systems still
need to use MMM programs to convert our archive format to
a format appropriate to their system. This code runs on
NCAR Crays. Applications for time to run this conversion
should be directed to Ginger Caldwell.
PLEASE NOTE: The Data Support Section does not support the MM5 software itself -
you must contact MM5 support for assistance.
Based on DSS experience with MM5 users, reading DSS data files from the NCAR Mass
Storage System for subsequent use as MM5 input should be done as follows:
1) The global grid data should NOT retain the COS-blocking, so do (e.g.):
msread -fBI Y11491 /DSS/Y11491
For GRIB formatted grids, they may need to run a patch after the unpack
to convert the GRIB array to IEEE floating point.
2) The ADP data should NOT retain the COS-blocking, and no linefeed delimiting
should be done, so do (e.g.):
msread -fBI Y18933 /DSS/Y18933
NOTES:
1) While these procedures will yield files that are readable by the MM5, they
are not universally readable by other software.
In particular, our own ADP software will not read an ADP file unless line-
feed delimiting is applied, which requires this (e.g.):
msread -fCH Y18933 /DSS/Y18933
2) When the only upper air data you need is radiosondes and pibals (ADPUPA),
use DS353.4 (List A) instead of DS353.1. Highly recommended because you
save the time involved with slogging through all the other higher volume
data types (AIRCFT, SATWND, AIRCAR) that are in each file of DS353.1.
For that matter, DS353.4 has both earlier and later data.
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| Updated 22 July 2005 |
