The Use of EPA's Currently Recommended Default Concentrations as Initial and Boundary Conditions in the Urban Airshed Model
Public Deposited- Last Modified
- February 28, 2019
- Creator
-
Jones, Nancy B.
- Affiliation: Gillings School of Global Public Health, Department of Environmental Sciences and Engineering
- Abstract
- EPA's list of recommended default concentrations, from the Guideline for Regulatory Application of the Urban Airshed Model, were substituted for SAI's AIRQUALITY, BOUNDARY, and TOP CONC files In the Atlanta 5-cities PLANR approach study. These concentrations were also substituted for the ROM (Regional Oxidant Model) derived AIRQUALITY, BOUNDARY and TOP CONC files in the ROM/UAM interface test case for the New York domain. In the case of Atlanta, where the differences between the original and default values were small, the peak concentrations each hour were within a few ppb of each other and domain-wide there were only changes of 10 to 15 ppb in the concentration contours. However, both runs miss the peak measured concentration by one-half. The default input concentrations were usually less than half of the ROM derived ones in the New York domain. Here there is a large decrease in the model output of ozone, up to 80 ppb near the southern boundary and 50 to 60 ppb in the area of maximum concentrations. Even with these large decreases,the difference between the UAM/ROM output concentrations and the observed ozone concentrations are greater than the difference between the UAM/ROM and the default run forecast concentrations of ozone.
- Date of publication
- January 1992
- DOI
- Resource type
- Rights statement
- In Copyright
- Advisor
- Fox, Donald L.
- Jeffries, Harvey E.
- Leith, David
- Degree
- Master of Science in Public Health
- Academic concentration
- Industrial Hygiene
- Degree granting institution
- University of North Carolina at Chapel Hill
- Graduation year
- 1992
- Language
- Deposit record
- c2589085-57f7-4434-bf45-a2666ba162b9
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