Document Detail


Contributors to ozone episodes in three US/Mexico border twin-cities.
MedLine Citation:
PMID:  19559465     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The Process Analysis tools of the Community Multiscale Air Quality (CMAQ) modeling system together with back-trajectory analysis were used to assess potential contributors to ozone episodes that occurred during June 1-4, 2006, in three populated U.S.-Mexico border twin cities: San Diego/Tijuana, Imperial/Mexicali and El Paso/Ciudad Juárez. Validation of CMAQ output against surface ozone measurements indicates that the predictions are acceptable with regard to commonly recommended statistical standards and comparable to other reported studies. The mean normalized bias test (MNBT) and mean normalized gross error (MNGE) for hourly ozone fall well within the US EPA suggested range of +/-15% and 35%, respectively, except MNBT for El Paso. The MNBTs for maximum 8-h average ozone are larger than those for hourly ozone, but all the simulated maximum 8-h average ozone are within a factor of 2 of those measured in all three regions. The process and back-trajectory analyses indicate that the main sources of daytime ground-level ozone are the local photochemical production and regional transport. By integrating the effects of each process over the depth of the daytime planetary boundary layer (PBL), it is found that in the San Diego area (SD), chemistry and vertical advection contributed about 36%/48% and 64%/52% for June 2 and 3, respectively. This confirms the previous finding that high-altitude regional transport followed by fumigation contributes significantly to ozone in SD. The back-trajectory analysis shows that this ozone was mostly transported from the coastal area of southern California. For the episodes in Imperial Valley and El Paso, respectively, ozone was transported from the coastal areas of southern California and Mexico and from northern Texas and Oklahoma.
Authors:
Chune Shi; H J S Fernando; Jie Yang
Related Documents :
17561775 - Sulfur dioxide dispersion and source contribution to receptors of downtown patras, greece.
10877315 - Combining contingency tables with missing dimensions.
19728485 - Comparison of flexible fuel vehicle and life-cycle fuel consumption and emissions of se...
18069455 - Fugitive emissions opacity determination using the digital opacity compliance system (d...
21390995 - Missing data in the regulation of medical devices.
19250775 - Blood alcohol concentrations among bar patrons: a multi-level study of drinking behavior.
Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2009-06-26
Journal Detail:
Title:  The Science of the total environment     Volume:  407     ISSN:  1879-1026     ISO Abbreviation:  Sci. Total Environ.     Publication Date:  2009 Sep 
Date Detail:
Created Date:  2009-07-27     Completed Date:  2009-10-06     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0330500     Medline TA:  Sci Total Environ     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  5128-38     Citation Subset:  IM    
Affiliation:
Center for Environmental Fluid Dynamics, Department of Mechanical and Aerospace Engineering, Arizona State University, Tempe, AZ 85287-9809, USA. ah_shichune@yahoo.ca
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Air Pollutants / analysis*
Mexico
Ozone / analysis*
United States
Chemical
Reg. No./Substance:
0/Air Pollutants; 10028-15-6/Ozone

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Occurrence and implications of estrogens and xenoestrogens in sewage effluents and receiving waters ...
Next Document:  Seasonal variations of elemental carbon in urban aerosols as measured by two common thermal-optical ...