Previous applications have typically used 50 m for the minimum

depth of the vertical layers below the diffusion break and 100

or 150 m for the vertical layers above the diffusion break.

It is recommended that 50 m be used as the minimum thickness

for layers below the diffusion break and 100 m as the minimum

thickness for layers above the diffusion break.

3.5 Meteorological Data

The availability of meteorological data varies widely among

prospective modeling domains. Also, there are a variety of

techniques available for developing wind fields, temperature

fields, and mixing heights. Although high resolution and

confidence for all meteorological data are desirable, time and

resource constraints force a compromise between desirable and

acceptable methods. Historically, measured meteorological data

have been interpolated for most UAM applications. More recently,

diagnostic and prognostic meteorological modeling techniques have

been explored as possible means to develop input fields

(particularly wind fields) for air quality models.

Wind fields and mixing heights are two of the most important

meteorological inputs that significantly affect photochemical model

predictions. Methodologies and recommendations for determining

these inputs are described below.

3.5.1 Wind fields

Methodologies to construct wind fields for the UAM

applications have historically fallen into three categories:6

1. Objective analyses that interpolate observed surface and

aloft data throughout the modeling domain

2. Diagnostic wind models in which physical constraints are

used in conjunction with objective analyses to determine

the wind field

3. Prognostic models based on numerical solution of the

governing equations for mass, momentum, energy, and

moisture conservation along with numerical solutions for



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