HR: 15:10h
AN: A53H-07    [Abstracts]
TI: Validation of OMI tropospheric NO₂ observations during INTEX-B and Application to Constrain NO_x Emissions Over the Eastern United States and Mexico
AU: Boersma, K F
EM: boersma@fas.harvard.edu
AF: Harvard University, School of Engineering and Applied Sciences 29 Oxford Street, Cambridge, MA 02138, United States
AU: * Jacob, D J
EM: djacob@fas.harvard.edu
AF: Harvard University, School of Engineering and Applied Sciences 29 Oxford Street, Cambridge, MA 02138, United States
AU: Bucsela, E J
EM: eric.bucsela@gsfc.nasa.gov
AF: University of Maryland, GEST Program Atmospheric Chemistry and Dynamics Branch NASA GSFC, Code 613.3, Greenbelt, MD 20771, United States
AU: Perring, A E
EM: aperring@berkeley.edu
AF: University of California, Department of Chemistry, Berkeley, CA 94720, United States
AU: Dirksen, R
EM: dirksen@knmi.nl
AF: KNMI, Wilhelminalaan 10, De Bilt, 3732 GK, Netherlands
AU: van der A, R J
EM: avander@knmi.nl
AF: KNMI, Wilhelminalaan 10, De Bilt, 3732 GK, Netherlands
AU: Yantosca, R M
EM: bym@io.as.harvard.edu
AF: Harvard University, School of Engineering and Applied Sciences 29 Oxford Street, Cambridge, MA 02138, United States
AU: Park, R J
EM: rjpark@snu.ac.kr
AF: Harvard University, School of Engineering and Applied Sciences 29 Oxford Street, Cambridge, MA 02138, United States
AU: Wenig, M O
EM: mark.o.wenig@gmail.com
AF: University of Maryland, GEST Program Atmospheric Chemistry and Dynamics Branch NASA GSFC, Code 613.3, Greenbelt, MD 20771, United States
AU: Bertram, T H
EM: tbertram@uclink.berkeley.edu
AF: University of California, Department of Chemistry, Berkeley, CA 94720, United States
AU: Cohen, R C
EM: rccohen@berkeley.edu
AF: University of California, Department of Chemistry, Berkeley, CA 94720, United States
AB: We compare tropospheric NO₂ column measurements from the Ozone Monitoring Instrument (OMI) aboard the EOS Aura satellite with coincident in situ aircraft measurements on vertical spirals over the southern United States, Mexico, and the Gulf of Mexico during the INTEX-B campaign in March 2006. Good correlation with no significant bias (r² = 0.67, slope=0.99 ± 0.17, n = 21) is found for the ensemble of comparisons when the aircraft could spiral sufficiently low to sample most of the NO₂ column. Urban spirals where large extrapolations were needed below the aircraft floor (1000 feet) showed poorer agreement. We use the OMI observations together with a global chemical transport model (GEOS-Chem) to estimate emissions of nitrogen oxides over the eastern United States and Mexico in March 2006. Comparison to EPA's National Emissions Inventory 1999 (NEI99) calls for a decrease in power plant emissions and an increase in on-road vehicle emissions relative to that inventory. These findings are consistent with independent assessments. Our OMI- derived emission estimates for Mexico are higher by a factor of 2.0 ± 0.3 than bottom-up emissions, similar to a comparison between the recently released Mexican NEI99 inventory and the bottom-up showing that the Mexican NEI99 inventory is 1.6-1.8 × higher.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0365 Troposphere: composition and chemistry
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting