Analysis of the effects of vertical grid resolution on the performance of the UAM-IV vs. UAM-V in the Lake Michigan region
- Earth Tech, Concord, MA (United States)
As part of the Cooperative Regional Model Evaluation (CReME) study, it was found that there was little difference in the abilities of the UAM-IV and UAM-V photochemical models to simulate the observed ozone concentrations during two 1991 ozone episodes in the Lake Michigan region. However, it was noted that UAM-V underpredicts the ozone precursors such as volatile organic compounds and nitrogen oxides (VOC and NO{sub x}) by less than does UAM-IV when compared to the extensive three-dimensional observations made during the Lake Michigan Ozone Study. UAM-IV was implemented using five vertical layers that can vary in thickness with space and time, depending on the local mixing depth. UAM-V was run using eight fixed layers with high resolution near the ground. It was hypothesized that UAM-IV`s relative inability to capture detailed spatial variability in the precursor fields could be due in large part to the diminished resolution of the model compared to UAM-V. In this paper, results from a ten-layer version of UAM-IV are compared to both UAM-V and the five-layer version of UAM-IV, using detailed ozone and ozone precursor measurements from both the surface and aircraft.
- OSTI ID:
- 422930
- Report Number(s):
- CONF-960127--
- Country of Publication:
- United States
- Language:
- English
Similar Records
Comparison of the UAM and UAM-V photochemical models for three Atlanta-area ozone episodes
Update of results from the Cooperative Regional Model Evaluation (CReME) project