Modeling Tips
Posts category: modeling-tips
15
Apr 2016
CALPUFF View - CALPOST’s New NO2/NOX Ratio Option
CALPOST, the post-processing model of the CALPUFF modeling system, has long had the option to estimate concentrations of nitrogen dioxide (NO2) from model-calculated concentrations of total nitrogen oxides (NOX). The user provided a single ratio which was applied to all NOX concentrations. The latest update to the CALPUFF modeling system, Version 7 (released in June 2015) contained an update in CALPOST which allows users to specify ratios which vary with NOX concentration.
15
Mar 2016
AERMOD View - Removing Plant Receptors
When modeling with AERMOD, it’s common to remove receptors that fall within the boundary of the facility’s property so as to only calculate concentrations that fall in the ambient environment.
15
Dec 2015
AERMOD View - 5-Minute ASOS Data in AERMINUTE
One of the model updates made by the U.S. EPA earlier this year was the release of the new AERMINUTE executable. AERMINUTE processes 1-minute ASOS wind data to generate hourly wind speed and wind direction averages to supplement data within standard hourly surface data files. Meteorological stations throughout the United States have gradually replaced manned observations with Automated Surface Observing Stations (ASOS). This led to a marked increase in missing or calm hours in the hourly observations which degrades the quality of air dispersion modeling analyses. AERMINUTE provides much higher wind data quality by processing the raw 1-minute data logged by the automated station.
