HR: 0800h
AN: A51D-0095    [Abstracts]
TI: Evaluation of Model Simulated Source Contributions to Tropospheric Ozone with Aircraft Observations on the Factor Projected Space
AU: * Shim, C
EM: cshim@eas.gatech.edu
AF: Georgia Institute of Technology, 311 Ferst Dr., Atlanta, GA 30329 United States
AU: Wang, Y
EM: ywang@eas.gatech.edu
AF: Georgia Institute of Technology, 311 Ferst Dr., Atlanta, GA 30329 United States
AU: Yoshida, Y
EM: yyoshida@eas.gatech.edu
AF: Georgia Institute of Technology, 311 Ferst Dr., Atlanta, GA 30329 United States
AB: Trace gas measurements from TOPSE and TRACE-P experiments and the corresponding GEOS-CHEM simulations are analyzed to evaluate the simulated source contributions to tropospheric ozone. The positive matrix factorization (PMF) is applied to 7 chemicals (O₃, NO_y, PAN, CO, C₃H₈, CH₃Cl, and ⁷Be) and one dynamic tracer (potential temperature). The evaluation has a bias towards high altitude of 5-8 km (~70 % of the data) for TOPSE and 7-12 km (40-50 % of the data) for TRACE-P due to the availability of ⁷Be measurements. We identify one stratospheric factor and three tropospheric factors including fossil fuel/industry, biomass burning, and meridional transport. Tagged O₃ simulations are applied to quantitatively estimate the stratospheric influence of simulated O₃. During TOPSE, the stratospheric factor contribution to O₃ variability of 16 ppbv is much higher than the model (only 4 ppbv), indicating a large underestimation. In contrast, the stratospheric factor contribution for TRACE-P is comparable between measurements and model (8-17 ppbv and 12-14 ppbv, respectively) at mid latitudes. At low latitudes during TRACE-P (< 30°N) the model and observations are in good agreement. The stratospheric factor contribution of 8 ppbv is smaller than mid and high latitudes. The biomass burning factor contribution is more significant at 12 ppbv.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0365 Troposphere: composition and chemistry
DE: 0368 Troposphere: constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005