HR: 08:15h
AN: A21F-02    [Abstracts]
TI: The WRF-Chemistry Air Quality Model: updates and online/offline comparisons
AU: * Grell, G A
EM: georg.a.grell@noaa.gov
AF: NOAA/FSL/CIRES, R/FS1 325 Broadway, Boulder, Co 80305-3337 United States
AU: Peckham, S E
EM: Steven.e.peckham@noaa.gov
AF: NOAA/FSL/CIRES, R/FS1 325 Broadway, Boulder, Co 80305-3337 United States
AU: Skamarock, W C
EM: skamaroc@ucar.edu
AF: NCAR/MMM, 3450 Mitchell Lane, Boulder, CO 80301 United States
AU: McKeen, S A
EM: stuart.a.mckeen@noaa.gov
AF: NOAA/AL/CIRES, 325 Broadway, Boulder, Co 80305-3337 United States
AB: This presentation will first describe the latest updates to the Weather Research and Forecasting (WRF) model as it is coupled to fully online chemistry. This model now includes many atmospheric chemistry routines covering biogenic emissions, deposition, photolysis, chemical mechanisms, and aerosols. Usually the chemistry and aerosol routines are solved in an 'online' or 'fully-coupled' fashion with the meteorological forecast model. In other words, the interaction and transport of meteorological, chemical, and aerosol species are calculated using the same physical parameterizations with no need to interpolate in time and/or space. However, the model can also be run using an offline method. This offline version still uses the same physics parameterization. Time averaged values of the meteorological fields are produced by the meteorological part of the model, and then interpolated in time to feed the chemical transport part of the model. The presentation will cover the evaluation of the WRF/Chem model using a test bed dataset from the summer of 2004. In addition, we will show comparisons of the online simulation with offline simulations using different coupling intervals. The simulations were done with a 12-km horizontal resolution and coupling intervals of 60-, 30-, and 10-min. Averaged surface statistics as well as results from one case will be shown.
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0368 Troposphere: constituent transport and chemistry
DE: 0466 Modeling
DE: 0478 Pollution: urban, regional and global (0345, 4251)
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005