Multiscale simulations of tropospheric chemistry in the eastern Pacific and on the U.S. West Coast during spring 2002

Youhua Tang, Gregory R. Carmichael, Larry W. Horowitz, Itsushi Uno, Jung Hun Woo, David G. Streets, Donald Dabdub, Gakuji Kurata, Adrian Sandu, James Allan, Elliot Atlas, Frank Flocke, Lewis Gregory Huey, Roger O. Jakoubek, Dylan B. Millet, Patricia K. Quinn, James M. Roberts, Douglas R. Worsnop, Allen Goldstein, Stephen Donnelly & 6 others Sue Schauffler, Verity Stroud, Kristen Johnson, Melody A. Avery, Hanwant B. Singh, Eric C. Apel

Research output: Contribution to journalArticle

23 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)1-25
Number of pages25
JournalJournal of Geophysical Research D: Atmospheres
Volume109
Issue number23
DOIs
Publication statusPublished - Dec 16 2004

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coasts
Coastal zones
chemistry
air masses
coast
air mass
Carbon Monoxide
simulation
Weather forecasting
weather forecasting
tracers
Air
tracer techniques
tracer
air
budgets
aircraft
contaminants
Aircraft
flight

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

Cite this

Multiscale simulations of tropospheric chemistry in the eastern Pacific and on the U.S. West Coast during spring 2002. / Tang, Youhua; Carmichael, Gregory R.; Horowitz, Larry W.; Uno, Itsushi; Woo, Jung Hun; Streets, David G.; Dabdub, Donald; Kurata, Gakuji; Sandu, Adrian; Allan, James; Atlas, Elliot; Flocke, Frank; Huey, Lewis Gregory; Jakoubek, Roger O.; Millet, Dylan B.; Quinn, Patricia K.; Roberts, James M.; Worsnop, Douglas R.; Goldstein, Allen; Donnelly, Stephen; Schauffler, Sue; Stroud, Verity; Johnson, Kristen; Avery, Melody A.; Singh, Hanwant B.; Apel, Eric C.

In: Journal of Geophysical Research D: Atmospheres, Vol. 109, No. 23, 16.12.2004, p. 1-25.

Research output: Contribution to journalArticle

Tang, Y, Carmichael, GR, Horowitz, LW, Uno, I, Woo, JH, Streets, DG, Dabdub, D, Kurata, G, Sandu, A, Allan, J, Atlas, E, Flocke, F, Huey, LG, Jakoubek, RO, Millet, DB, Quinn, PK, Roberts, JM, Worsnop, DR, Goldstein, A, Donnelly, S, Schauffler, S, Stroud, V, Johnson, K, Avery, MA, Singh, HB & Apel, EC 2004, 'Multiscale simulations of tropospheric chemistry in the eastern Pacific and on the U.S. West Coast during spring 2002', Journal of Geophysical Research D: Atmospheres, vol. 109, no. 23, pp. 1-25. https://doi.org/10.1029/2004JD004513
Tang, Youhua ; Carmichael, Gregory R. ; Horowitz, Larry W. ; Uno, Itsushi ; Woo, Jung Hun ; Streets, David G. ; Dabdub, Donald ; Kurata, Gakuji ; Sandu, Adrian ; Allan, James ; Atlas, Elliot ; Flocke, Frank ; Huey, Lewis Gregory ; Jakoubek, Roger O. ; Millet, Dylan B. ; Quinn, Patricia K. ; Roberts, James M. ; Worsnop, Douglas R. ; Goldstein, Allen ; Donnelly, Stephen ; Schauffler, Sue ; Stroud, Verity ; Johnson, Kristen ; Avery, Melody A. ; Singh, Hanwant B. ; Apel, Eric C. / Multiscale simulations of tropospheric chemistry in the eastern Pacific and on the U.S. West Coast during spring 2002. In: Journal of Geophysical Research D: Atmospheres. 2004 ; Vol. 109, No. 23. pp. 1-25.
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AU - Tang, Youhua

AU - Carmichael, Gregory R.

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AU - Uno, Itsushi

AU - Woo, Jung Hun

AU - Streets, David G.

AU - Dabdub, Donald

AU - Kurata, Gakuji

AU - Sandu, Adrian

AU - Allan, James

AU - Atlas, Elliot

AU - Flocke, Frank

AU - Huey, Lewis Gregory

AU - Jakoubek, Roger O.

AU - Millet, Dylan B.

AU - Quinn, Patricia K.

AU - Roberts, James M.

AU - Worsnop, Douglas R.

AU - Goldstein, Allen

AU - Donnelly, Stephen

AU - Schauffler, Sue

AU - Stroud, Verity

AU - Johnson, Kristen

AU - Avery, Melody A.

AU - Singh, Hanwant B.

AU - Apel, Eric C.

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