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3.5.9 Specifying Vertical Temperature Gradients

 

     While the model uses default vertical potential temperature gradients if the regulatory default option is selected (see the CO MODELOPT description in Section 3.2.2), for non‑regulatory default applications the user can specify vertical potential temperature gradients  through use of the DTHETADZ keyword on the ME pathway.  The syntax and type of this keyword are summarized below:

 

Syntax:

ME DTHETADZ  Stab  Dtdz1 Dtdz2 Dtdz3 Dtdz4 Dtdz5 Dtdz6

Type:

Optional, Repeatable

 

where the Stab parameter specifies the stability category for the following six values, and Dtdz1 through Dtdz6 are the vertical potential temperature gradients for each of the six wind speed categories.  The Stab parameter may be input either alphabetically (A through F) or numerically (1 for A through 6 for F).  The DTHETADZ cards do not need to be input in any particular order.

 

     The wind speed categories are either the default categories used by the model (with upper bound speeds of 1.54, 3.09, 5.14, 8.23, and 10.8 m/s for the first five categories ‑ the sixth category is assumed to have no upper bound), or the  categories specified by the user on the optional ME WINDCATS keyword (Section 3.5.6).

 

     The following example will input the default values of DTDZ, and illustrates the use of a repeat value for applying the inputs to all six wind speed categories:

 

ME DTHETADZ  A  6*0.00

ME DTHETADZ  B  6*0.00

ME DTHETADZ  C  6*0.00

ME DTHETADZ  D  6*0.00

ME DTHETADZ  E  6*0.020

ME DTHETADZ  F  6*0.035

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If the regulatory default option has been selected, then any inputs on the DTHETADZ keyword are ignored by the model, and a non‑fatal warning message is generated.

 

 

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