Journal article
Multiscale simulations of tropospheric chemistry in the eastern Pacific and on the U.S. West Coast during spring 2002
Journal of Geophysical Research: Atmospheres, Vol.109(D23), pp.D23S11-n/a
12/16/2004
DOI: 10.1029/2004JD004513
Abstract
Regional modeling analysis for the Intercontinental Transport and Chemical Transformation 2002 (ITCT 2K2) experiment over the eastern Pacific and U.S. West Coast is performed using a multiscale modeling system, including the regional tracer model Chemical Weather Forecasting System (CFORS), the Sulfur Transport and Emissions Model 2003 (STEM‐2K3) regional chemical transport model, and an off‐line coupling with the Model of Ozone and Related Chemical Tracers (MOZART) global chemical transport model. CO regional tracers calculated online in the CFORS model are used to identify aircraft measurement periods with Asian influences. Asian‐influenced air masses measured by the National Oceanic and Atmospheric Administration (NOAA) WP‐3 aircraft in this experiment are found to have lower ΔAcetone/ΔCO, ΔMethanol/ΔCO, and ΔPropane/ΔEthyne ratios than air masses influenced by U.S. emissions, reflecting differences in regional emission signals. The Asian air masses in the eastern Pacific are found to usually be well aged (>5 days), to be highly diffused, and to have low NOy levels. Chemical budget analysis is performed for two flights, and the O3 net chemical budgets are found to be negative (net destructive) in the places dominated by Asian influences or clear sites and positive in polluted American air masses. During the trans‐Pacific transport, part of gaseous HNO3 was converted to nitrate particle, and this conversion was attributed to NOy decline. Without the aerosol consideration, the model tends to overestimate HNO3 background concentration along the coast region. At the measurement site of Trinidad Head, northern California, high‐concentration pollutants are usually associated with calm wind scenarios, implying that the accumulation of local pollutants leads to the high concentration. Seasonal variations are also discussed from April to May for this site. A high‐resolution nesting simulation with 12‐km horizontal resolution is used to study the WP‐3 flight over Los Angeles and surrounding areas. This nested simulation significantly improved the predictions for emitted and secondary generated species. The difference of photochemical behavior between the coarse (60‐km) and nesting simulations is discussed and compared with the observation.
Details
- Title: Subtitle
- Multiscale simulations of tropospheric chemistry in the eastern Pacific and on the U.S. West Coast during spring 2002
- Creators
- Youhua Tang - University of IowaGregory R Carmichael - University of IowaLarry W Horowitz - Geophysical Fluid Dynamics Laboratory, NOAAItsushi Uno - Kyushu UniversityJung‐Hun Woo - University of IowaDavid G Streets - Argonne National LaboratoryDonald Dabdub - University of CaliforniaGakuji Kurata - Toyohashi University of TechnologyAdrian Sandu - Virginia Polytechnic Institute and State UniversityJames Allan - University of Manchester Institute of Science and TechnologyElliot Atlas - National Center for Atmospheric ResearchFranck Flocke - National Center for Atmospheric ResearchLewis Gregory Huey - Georgia Institute of TechnologyRoger O Jakoubek - Aeronomy Laboratory, NOAADylan B Millet - University of CaliforniaPatricia K Quinn - Pacific Marine Environmental Laboratory, NOAAJames M Roberts - Aeronomy Laboratory, NOAADouglas R Worsnop - Aerodyne Research IncAllen Goldstein - University of CaliforniaStephen Donnelly - National Center for Atmospheric ResearchSue Schauffler - National Center for Atmospheric ResearchVerity Stroud - National Center for Atmospheric ResearchKristen Johnson - National Center for Atmospheric ResearchMelody A Avery - NASA Langley Research CenterHanwant B Singh - NASA Ames Research CenterEric C Apel - National Center for Atmospheric Research
- Resource Type
- Journal article
- Publication Details
- Journal of Geophysical Research: Atmospheres, Vol.109(D23), pp.D23S11-n/a
- DOI
- 10.1029/2004JD004513
- ISSN
- 0148-0227
- eISSN
- 2156-2202
- Number of pages
- 25
- Language
- English
- Date published
- 12/16/2004
- Academic Unit
- Nursing; Chemical and Biochemical Engineering; Civil and Environmental Engineering
- Record Identifier
- 9984003431702771
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