HR: 14:25h
AN: A53D-04    [Abstracts]
TI: Lagrangian Characterization of the Sources and Chemical Transformation of Airmasses Observed by the NASA DC-8 During ICARTT/INTEX-A
AU: * Al-Saadi, J
EM: j.a.al-saadi@nasa.gov
AF: NASA Langley Research Center, MS 401B, Hampton, VA 23681 United States
AU: Pierce, R B
EM: r.b.pierce@larc.nasa.gov
AF: NASA Langley Research Center, MS 401B, Hampton, VA 23681 United States
AU: Fairlie, T D
EM: t.d.fairlie@larc.nasa.gov
AF: NASA Langley Research Center, MS 401B, Hampton, VA 23681 United States
AU: Kittaka, C
EM: fn.c.kittaka@larc.nasa.gov
AF: NASA Langley Research Center, MS 401B, Hampton, VA 23681 United States
AU: Kittaka, C
EM: fn.c.kittaka@larc.nasa.gov
AF: SAIC, 22 Enterprise Pkwy, Hampton, VA 23666 United States
AU: Schaack, T K
EM: todd.schaack@ssec.wisc.edu
AF: University of Wisconsin, Space Science and Engineering Center, Madison, WI 53706 United States
AU: Zapotocny, T
EM: tom.zapotocny@ssec.wisc.edu
AF: University of Wisconsin, Space Science and Engineering Center, Madison, WI 53706 United States
AU: Johnson, D R
EM: donj@ssec.wisc.edu
AF: University of Wisconsin, Space Science and Engineering Center, Madison, WI 53706 United States
AU: Avery, M A
EM: melody.a.avery@nasa.gov
AF: NASA Langley Research Center, MS 401B, Hampton, VA 23681 United States
AU: Thompson, A
EM: anne@met.psu.edu
AF: Pennsylvania State University, Department of Meteorology, University Park, PA 16802 United States
AU: Cohen, R C
EM: cohen@cchem.berkeley.edu
AF: University of California, Department of Chemistry, Berkeley, CA 94720 United States
AU: Dibb, J E
EM: jack.dibb@unh.edu
AF: University of New Hampshire, 39 College Road, Durham, NH 03824 United States
AU: Crawford, J H
EM: james.h.crawford@nasa.gov
AF: NASA Langley Research Center, MS 401B, Hampton, VA 23681 United States
AU: Rault, D F
EM: didier.f.rault@nasa.gov
AF: NASA Langley Research Center, MS 401B, Hampton, VA 23681 United States
AU: Szykman, J J
EM: szykman.jim@epamail.epa.gov
AF: NASA Langley Research Center, MS 401B, Hampton, VA 23681 United States
AU: Szykman, J J
EM: szykman.jim@epamail.epa.gov
AF: US Environmental Protection Agency, Office of Research and Development, Research Triangle Pk, NC 27709 United States
AU: Martin, R
EM: randall.martin@dal.ca
AF: Dalhousie University, Department of Physics and Atmospheric Science, Halifax, NS B3H3J5 Canada
AB: The global component of the Regional Air Quality Modeling System (RAQMS global) was used to provide atmospheric chemical composition forecasts for flight planning purposes during the 2004 ICARTT/INTEX-A measurement campaign. A unique aspect of these predictions is that satellite ozone observations, including high-vertical-resolution stratospheric profiles, are assimilated to improve the chemical forecasts. Post mission analysis has focused on using Lagrangian back trajectories, initialized from the NASA DC-8 flight track, to characterize the airmasses sampled by the DC-8. In this analysis the dynamical and chemical fields generated by the RAQMS-global prediction are sampled by 5-day back trajectories and then composited to identify the source regions and chemical and dynamical influences on the sampled airmasses. We briefly demonstrate the fidelity of the RAQMS global predictions through comparisons with ozonesonde and aircraft insitu measurements. We then show results of the Lagrangian source analysis to demonstrate the contributions of chemical and dynamical processes to the observed airmass composition, particularly focusing on budgets of ozone and nitrogen oxides. Our analysis shows that the middle and upper tropospheric air sampled over the continental US during July 2004 was strongly influenced by remote source regions including the central Pacific lower stratosphere, eastern Pacific mid troposphere, Canadian free troposphere, and maritime air from the Gulf of Mexico and the Bahamas. Convective vertical exchange during long range transport of these air masses results in a vertical coupling between the upper and lower troposphere, with Lagrangian averaged convective sinks of upper tropospheric ozone and convective sources of lower tropospheric and boundary layer ozone.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0322 Constituent sources and sinks
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0365 Troposphere: composition and chemistry
DE: 0368 Troposphere: constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005