29.01.2015 Views

Table of Contents - The Atmospheric Studies Group at TRC

Table of Contents - The Atmospheric Studies Group at TRC

Table of Contents - The Atmospheric Studies Group at TRC

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

Section 8: CALMET Model Files<br />

8.7 Preprocessed Diagnostic Model D<strong>at</strong>a File (DIAG.DAT)<br />

<strong>The</strong> CALMET control file contains variables which determine how the meteorological d<strong>at</strong>a required by<br />

the diagnostic wind field module are entered into the program. <strong>The</strong> variables IDIOPT1 through IDIOPT5<br />

<strong>of</strong> Input <strong>Group</strong> 5 in the control file determine whether the hourly st<strong>at</strong>ion observ<strong>at</strong>ion and domain-scale<br />

average surface temper<strong>at</strong>ure, lapse r<strong>at</strong>e, and wind components are internally computed from the d<strong>at</strong>a in<br />

the surface and upper air d<strong>at</strong>a files or read directly from a separ<strong>at</strong>e file, DIAG.DAT.<br />

<strong>The</strong> DIAG.DAT file allows the user to bypass the internal CALMET comput<strong>at</strong>ion involving the<br />

interpol<strong>at</strong>ion and sp<strong>at</strong>ial averaging <strong>of</strong> the meteorological inputs to the model by specifying these inputs<br />

directly. This option has been retained in the oper<strong>at</strong>ional version <strong>of</strong> the model although it was intended<br />

primarily as a testing tool. <strong>The</strong> use <strong>of</strong> the DIAG.DAT file requires th<strong>at</strong> the time interpol<strong>at</strong>ion <strong>of</strong> the<br />

sounding d<strong>at</strong>a and routine averaging <strong>of</strong> upper layer winds through the depth <strong>of</strong> each vertical layer, as well<br />

as conversion <strong>of</strong> the wind components from wind speed and direction to U and V components, all be<br />

performed externally.<br />

A sample DIAG.DAT file containing two hours <strong>of</strong> d<strong>at</strong>a is shown in <strong>Table</strong> 8-17. A description <strong>of</strong> each<br />

variable in the file and its input form<strong>at</strong> is contained in <strong>Table</strong> 8-18. <strong>The</strong> variables included in the<br />

DIAG.DAT file depend on the option selected in the CALMET control file. A value <strong>of</strong> one for the<br />

following control file parameters is used to flag input <strong>of</strong> the corresponding meteorological variable via the<br />

DIAG.DAT file. A value <strong>of</strong> zero indic<strong>at</strong>es the meteorological variable is internally computed by the<br />

model from the d<strong>at</strong>a in the SURF.DAT and UPn.DAT files. <strong>The</strong> default value for each control file<br />

parameter is set to compute the meteorological variables internally.<br />

Control File Parameter<br />

IDIOPT1<br />

IDIOPT2<br />

IDIOPT3<br />

IDIOPT4<br />

IDIOPT5<br />

Meteorological Variable<br />

Domain-average surface temper<strong>at</strong>ure<br />

Domain-average vertical temper<strong>at</strong>ure lapse r<strong>at</strong>e<br />

Domain-average winds (U and V components)<br />

Hourly surface st<strong>at</strong>ion winds (U and V components)<br />

Hourly upper air st<strong>at</strong>ion winds (U and V components)<br />

<strong>The</strong> wind observ<strong>at</strong>ions in DIAG.DAT are entered with d<strong>at</strong>a for one st<strong>at</strong>ion per line. <strong>The</strong> end <strong>of</strong> the<br />

surface d<strong>at</strong>a and upper air d<strong>at</strong>a are both flagged by a record with a st<strong>at</strong>ion name <strong>of</strong> 'LAST'.<br />

8-85

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!