AERMOD Tech Guide

Gaussian Plume Air Dispersion Model

8. Appendix: Input/Output Needs & Data Usage

Besides defining surface characteristics, the user provides several files of hourly meteorological data for processing by AERMET. At the present time AERMET is designed to accept data from any for the following sources: 1) standard hourly National Weather Service (NWS) data from the most representative site; 2) morning soundings of winds, temperature, and dew point from the nearest NWS upper air station; and 3) on-site wind, temperature, turbulence, pressure, and radiation measurements (if available).

The minimum measured and/or derived data needed to run the AERMOD modeling system are as follows:


8. Appendix: Input/Output Needs & Data Usage

8.1 AERMET Input Data Needs

8.1.1 Meteorology

8.1.2 Directionally and/or Monthly Varying Surface Characteristics

8.1.3 Other

8.1.4 Optional

8.2 Estimation of Solar Insolation for Small Solar Elevation Angles

8.3 Selection & Use of Measured Winds, Temperature & Turbulence in AERMET

8.3.1 Threshold Wind Speed

8.3.2 Reference Temperature & Height

8.3.3 Reference Wind Speed & Height

8.3.4 Calculating the Potential Temperature Gradient above the Mixing Height from Sounding Data

8.3.5 Measured Turbulence

8.3.6 Data Substitution for Missing On-site Data

8.4 Information passed by AERMET to AERMOD

8.5 Restrictions on the Growth of PBL Height

8.6 Initializing the Mechanical Mixing Height Smoothing Procedure

8.7 Determining the Mixing Height when the Sounding is too Shallow

8.8 Input Data Needs for AERMAP

8.9 Information passed by AERMAP to AERMOD

8.10 Wind Speed & Turbulence Limits used in Model Calculations

8.11 Using Profiles for Interpolating between Observations

8.12 Using Measured Mixing Heights