HR: 1340h
AN: A13A-0087    [Abstracts]
TI: Global Inverse Modeling of Aerosols Using the Adjoint Method
AU: * Henze, D K
EM: daven@caltech.edu
AF: Caltech, Department of Chemical Engineering, 1200 East California Blvd, Pasadena, CA 91125
AU: Seinfeld, J H
EM: seinfeld@caltech.edu
AF: Caltech, Department of Chemical Engineering, 1200 East California Blvd, Pasadena, CA 91125
AU: Liao, W
EM: liao@cs.vt.edu
AF: Virginia Tech, Department of Computer Science, 660 McBryde Hall (0106), Blacksburg, VA 24061
AU: Sandu, A
EM: sandu@cs.vt.edu
AF: Virginia Tech, Department of Computer Science, 660 McBryde Hall (0106), Blacksburg, VA 24061
AU: Carmichael, G
EM: gcarmich@icaen.uiowa.edu
AF: University of Iowa, Center for Global and Regional Environmental Research, CGRER, 424 IATL, Iowa City, IA 52242
AB: The feasibility of using the adjoint method to provide spatially and temporally optimized inventories of aerosol and aerosol precursor emissions is explored for the first time. The global chemical transport model GEOS-CHEM is used to simulate hourly total concentrations of the ammonium-sulfate-nitrate particulate system for one month at 4$^\circ$ $\times$ 5$^\circ$ resolution. An adjoint model is developed which explicitly treats aerosol thermodynamics and transport. The gradients from the adjoint model are used to minimize the discrepancy between model output and simulated observations. Starting with assumed scalar parameters representing monthly emissions over a few large areas, the aerosol inventories are optimized to have increased temporal and spatial resolution in order to improve not only globally averaged model performance, but also agreement between predicted and observed time varying aerosol concentrations at specific surface sites. The extent to which the success of this method depends upon the quality and frequency of the observations is investigated, and development of an increasingly detailed adjoint model (including further physical processes such as tropospheric chemistry, wet deposition, etc.) is explored.
DE: 3210 Modeling
DE: 3260 Inverse theory
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0322 Constituent sources and sinks
DE: 0345 Pollution--urban and regional (0305)
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting