NCDC data formats into a form required by the MESOPAC
meteorological model. READ56 operates on the older TD-5600
data format. Although this format is not currently used by
NCDC, many historical data sets contain data in this format.
READ62 processes data in the current TD-6201 format.
Although the data inputs are different, the user inputs to
the program are identical as is the processed output file. In
the user input file, the user selects the starting and ending
dates of the data to be extracted and the top pressure level.
Also selected are processing options determining how missing
data are treated. The programs will flag or eliminate sounding
levels with missing data.
If the user selects the option to flag (rather than
eliminate) levels with missing data, the data field of the
missing variables are flagged with a series of nines. If the
option to eliminate levels with missing data is chosen, only
sounding levels with all values valid will be included in the
output data file.
Although MESOPAC allows missing values of wind speed, wind
direction, and temperature at intermediate levels (i.e., levels
other than the surface and model top), the user is cautioned
against using soundings with significant gaps due to missing
data. For example, adequate vertical resolution of the morning
temperature structure near the surface is especially important
to the model for predicting daytime mixing heights. It should
be kept in mind that the model will fill in missing data by
assuming that a straight-line interpolation between valid
levels is appropriate. If this assumption is questionable, the
sounding should not be used with the model.
Two input files are required by the preprocessor: a user
input control file and the NCDC upper air data file. Two
output files are produced: a list file summarizing the user
option selected and missing data monitored and the processed
data file in MESOPAC format. Table A-1 contains a listing of
the input and output files for READ56 and READ62.
The READ56/READ62 control file consists of two lines of
data entered in FORTRAN free format. A description of each
input variable is shown in Table A-2. A sample input file is
shown in Table A-3.
The output data file (UP.DAT) produced by READ56/READ62 is
a formatted file containing the pressure, elevation,
temperature, wind speed, and wind direction at each sounding
level. The contents and format of the UP.DAT file are
discussed in Section A.2.3.
n1301 - n1302 - n1303 - n1304 - n1305 - n1306 - n1307 - n1308 - n1309 - n1310 - n1311 - n1312 - n1313 - n1314 - n1315 - n1316 - n1317 - n1318 - n1319 - n1320 - n1321 - n1322 - n1323 - n1324 - n1325 - n1326 - n1327 - n1328 - n1329 - n1330 - n1331 - n1332 - n1333 - n1334 - n1335 - n1336 - n1337 - n1338 - n1339 - n1340 - n1341 - n1342 - n1343 - n1344 - n1345 - n1346 - n13247 - n1348 - n1349 - n1350
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