We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
CO source contribution analysis for California during ARCTAS-CARB.
- Authors
Pfister, G. G.; Avise, J.; Wiedinmyer, C.; Edwards, D. P.; Emmons, L. K.; Diskin, G. D.; Podolske, J.; Wisthaler, A.
- Abstract
Air pollution is of concern in many parts of California and is impacted by both local emissions and also by pollution inflow from the Pacific. In this study, we use the regional chemical transport model WRF-Chem V3.2 to examine the CO budget over California. We include model CO tracers for different emission sources in the model, which allow estimating the relative importance of local sources versus pollution inflow on the distribution of CO at the surface and in the free troposphere. The focus of our study is on the 15 June-15 July 2008 time period, which coincides with the aircraft deployment of the NASA Arctic Research of the Composition of the Troposphere from Aircraft and Satellites (ARCTAS) mission over California. Model simulations are evaluated using these aircraft observations as well as satellite retrievals and surface observations of CO. Evaluation results show that the model overall predicts the observed CO fields well, but points towards an underestimate of CO from the fires in Northern California, which had a strong influence during the study period, and towards a slight overestimate of CO from pollution inflow and local anthropogenic sources. The analysis of the CO budget over California reveals that inflow of CO explains on average 53±21% of surface CO during the study period, compared to 22±18%for local anthropogenic sources and 18±22% for ?res. In the free troposphere, the average CO contributions are estimated as 78±16% for CO inflow, 6±4% for CO from local anthropogenic sources and 11±13% for CO from fires.
- Subjects
CALIFORNIA; UNITED States; CARBON monoxide; AIR pollution; TROPOSPHERE; MATHEMATICAL models; UNITED States. National Aeronautics &; Space Administration
- Publication
Atmospheric Chemistry & Physics Discussions, 2011, Vol 11, Issue 2, p3627
- ISSN
1680-7367
- Publication type
Article
- DOI
10.5194/acpd-11-3627-2011