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Table of Contents - The Atmospheric Studies Group at TRC

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Section 8: CALMET Model Files<br />

8.11 CALMET Output Files<br />

8.11.1 CALMET.DAT<br />

<strong>The</strong> CALMET.DAT file contains gridded meteorological d<strong>at</strong>a fields required to drive the CALPUFF<br />

model. It also contains certain geophysical fields, such as terrain elev<strong>at</strong>ions, surface roughness lengths,<br />

and land use types, used by both the CALMET meteorological model and CALPUFF. Although the input<br />

requirements <strong>of</strong> CALPUFF are designed to be directly comp<strong>at</strong>ible with CALMET, meteorological fields<br />

produced by other meteorological models can be substituted for the CALMET output as long as the<br />

required variables are produced and the output is reform<strong>at</strong>ted to be consistent with the CALMET.DAT<br />

file specific<strong>at</strong>ions described in this section.<br />

CALMET.DAT File - Header Records<br />

<strong>The</strong> CALMET.DAT file consists <strong>of</strong> a set <strong>of</strong> up to fifteen header records, plus a variable number <strong>of</strong><br />

comment records, followed by a set <strong>of</strong> hourly d<strong>at</strong>a records. <strong>The</strong> header records contain file identific<strong>at</strong>ion<br />

labels, descriptive titles <strong>of</strong> the CALMET run (including a complete image <strong>of</strong> the CALMET control file)<br />

as comment records, inform<strong>at</strong>ion including the horizontal and vertical grid systems <strong>of</strong> the meteorological<br />

grid, the number, type, and coordin<strong>at</strong>es <strong>of</strong> the meteorological st<strong>at</strong>ions included in the CALMET run,<br />

gridded fields <strong>of</strong> surface roughness lengths, land use, terrain elev<strong>at</strong>ions, leaf area indexes, and a precomputed<br />

field <strong>of</strong> the closest surface meteorological st<strong>at</strong>ion number to each grid point.<br />

In addition to the variable number <strong>of</strong> comment records, the number <strong>of</strong> header records may also vary<br />

because records containing surface, upper air, and precipit<strong>at</strong>ion st<strong>at</strong>ion coordin<strong>at</strong>es are not included if<br />

these st<strong>at</strong>ions were not included in the run. A description <strong>of</strong> each variable in the header records is<br />

provided in <strong>Table</strong> 8-26.<br />

Sample FORTRAN write st<strong>at</strong>ements for the CALMET.DAT header records are:<br />

c --- Header record #1 - File Declar<strong>at</strong>ion -- 24 words<br />

write(iomet) DATASET,DATAVER,DATAMOD<br />

c --- Header record #2 - Number <strong>of</strong> comment lines -- 1 word<br />

write(iomet) NCOM<br />

c --- Header record #3 to NCOM+2 (Comment record section) -- 33 words each<br />

write(iomet) COMMENT<br />

c --- Header record #NCOM+3 - run control parameters -- 39 words<br />

write(iomet) IBYR,IBMO,IBDY,IBHR,IBSEC,<br />

2 IEYR,IEMO,IEDY,IEHR,IESEC,AXTZ,IRLG,IRTYPE,<br />

3 NX,NY,NZ,DGRID,XORIGR,YORIGR, IWFCOD,NSSTA,<br />

8-121

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