HR: 0800h
AN: A11B-0868    [Abstracts]
TI: The sensitivity of ozone and hydroxyl to increased speciation of ketones in the new Regional Atmospheric Chemistry Mechanism, Version 2
AU: * Goliff, W S
EM: Wendy.Goliff@dri.edu
AF: Desert Research Institute, 2215 Raggio Parkway, Reno, NV 89512 United States
AU: Stockwell, W R
EM: William.Stockwell@dri.edu
AF: Desert Research Institute, 2215 Raggio Parkway, Reno, NV 89512 United States
AU: Stockwell, W R
EM: William.Stockwell@dri.edu
AF: Howard University, 525 College Street, NW, Washington, DC 20059 United States
AB: The new Regional Atmospheric Chemistry Mechanism, Version 2 (RACM2) contains the speciated ketones acetone, methyl ethyl ketone, and methyl vinyl ketone, as well as higher ketones aggregated as KET, while the previous version of the Regional Atmospheric Chemistry Mechanism (RACM) (Stockwell et al., 1997) aggregates all ketones into a single species (KET). An atmospheric chemistry box-model (SBOX: Seefeld, 1997) is used to estimate the impact of the increased speciation of ketones on ozone and hydroxyl concentrations for the new RACM2 as compared to the older RACM scheme using aloft conditions in the free troposphere. As RACM treats KET as a mixture of acetone and methyl ethyl ketone, RACM2's treatment of acetone and methyl ethyl ketone explicitly is compared to RACM's KET. The effect of the increased speciation of ketones is also investigated as a function of altitude.
DE: 0317 Chemical kinetic and photochemical properties
DE: 0340 Middle atmosphere: composition and chemistry
DE: 0365 Troposphere: composition and chemistry
DE: 3355 Regional modeling
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005