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Table of Contents - The Atmospheric Studies Group at TRC

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Section 8: CALMET Model Files<br />

8.9 MM4/MM5/3D Model D<strong>at</strong>a Files (MM4.DAT, MM5.DAT, 3D.DAT)<br />

<strong>The</strong> CALMET model allows as input the use <strong>of</strong> gridded prognostic winds from MM4, MM5 or any<br />

oper<strong>at</strong>ional we<strong>at</strong>her forecasting model such as Eta or RUC. <strong>The</strong> use <strong>of</strong> the prognostic wind field option is<br />

controlled by the variable IPROG in Input <strong>Group</strong> 5 <strong>of</strong> the CALMET control file. A choice <strong>of</strong> six methods<br />

<strong>of</strong> incorpor<strong>at</strong>ing the MM4/MM5/3D wind d<strong>at</strong>a into the model is available.<br />

If IPROG = 3 use MM4/MM5 (MM4.DAT) winds as the Step 1 field when using the<br />

objective analysis<br />

IPROG = 4 use MM4/MM5 (MM4.DAT) winds as the initial guess field when using<br />

the diagnostic module<br />

IPROG = 5 tre<strong>at</strong> MM4/MM5 (MM4.DAT) winds as observ<strong>at</strong>ions.<br />

IPROG = 13 use MM5/3D (MM5.DAT/3D.DAT) winds as the Step 1 field when<br />

using the objective analysis<br />

IPROG = 14 use MM5/3D (MM5.DAT/3D.DAT) winds as the initial guess field when<br />

using the diagnostic module<br />

IPROG = 15 tre<strong>at</strong> MM5/3D (MM5.DAT/3D.DAT) winds as observ<strong>at</strong>ions.<br />

If one <strong>of</strong> the first three methods is chosen, the gridded MM4/MM5 fields are read from a file called<br />

MM4.DAT. If one <strong>of</strong> the second three methods is chosen, the gridded MM5/3D fields are read from a file<br />

called MM5.DAT/3D.DAT. Note th<strong>at</strong> the MM5.DAT/3D.DAT file contains fields provided by MM5<br />

th<strong>at</strong> are not provided by MM4. Within CALMET these fields are interpol<strong>at</strong>ed from the prognostic model<br />

grid system to the CALMET grid.<br />

<strong>The</strong> MM4.DAT file is a form<strong>at</strong>ted d<strong>at</strong>a file containing header records describing the d<strong>at</strong>e, time, and<br />

domain <strong>of</strong> the prognostic model run. <strong>The</strong> extraction subdomain is defined in terms <strong>of</strong> (I,J) and l<strong>at</strong>itude<br />

and longitude. Terrain elev<strong>at</strong>ion and land use description code are also provided for each grid cell in the<br />

subdomain. <strong>The</strong> sigma-p values used by MM4/MM5/3D to define each <strong>of</strong> the vertical layers are also<br />

contained in the header records <strong>of</strong> MM4.DAT.<br />

<strong>The</strong> d<strong>at</strong>a records consist <strong>of</strong> a d<strong>at</strong>e and time record, then a d<strong>at</strong>a record consisting <strong>of</strong> elev<strong>at</strong>ion (m MSL) and<br />

winds <strong>at</strong> each grid cell for each vertical level. <strong>The</strong> surface level is followed by the mand<strong>at</strong>ory levels <strong>of</strong><br />

1000, 925, 850, 700, 500, 400, and 300 mb. All subterranean mand<strong>at</strong>ory levels will have wind direction<br />

and wind speed <strong>of</strong> 0.<br />

A sample MM4.DAT file is presented in <strong>Table</strong> 8-20, and a description <strong>of</strong> each record is presented in<br />

<strong>Table</strong> 8-21.<br />

<strong>The</strong> MM5.DAT file is also a form<strong>at</strong>ted d<strong>at</strong>a file similar to the MM4.DAT file. Header records describe<br />

the prognostic model run and the subdomain and time period extracted to the MM5.DAT file. D<strong>at</strong>a<br />

8-91

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