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CHANGES TO THE BIOGENIC EMISSION INVENTORY SYSTEM VERSION 3 (BEIS3)
Citation:
SCHWEDE, D. B., G. POULIOT, AND T. E. PIERCE. CHANGES TO THE BIOGENIC EMISSION INVENTORY SYSTEM VERSION 3 (BEIS3). Presented at 4th Annual CMAS Models-3 User's Conference, Chapel Hill, NC, September 26 - 28, 2005.
Impact/Purpose:
The objectives of this task are to develop, improve, and evaluate EPA's Community Multiscale Air Quality (CMAQ) model, as an air quality management and NAAQS implementation tool. CMAQ is a multiscale and multi-pollutant chemistry-transport model (CTM) that includes the necessary critical science process modules for atmospheric transport, deposition, cloud mixing, emissions, gas- and aqueous-phase chemical transformation processes, and aerosol dynamics and chemistry. To achieve the advances in CMAQ, research will be conducted to develop and test appropriate chemical and physical mechanisms, improve the accuracy of emissions and dry deposition algorithms, and to develop and improve state-of-the-science meteorology models and contributing process parameterizations.
The model will be tested and evaluated to thoroughly characterize the performance of the emissions, meteorological and chemical/transport modeling components of the CMAQ system, with an emphasis on the chemical/transport model, CMAQ. Emissions-based models are composed of highly complex scientific hypotheses concerning natural processes that can be evaluated through comparison with observations, but not truly validated. Both operational and diagnostic evaluations, together with sensitivity analyses are needed to both establish credibility and build confidence within the client and scientific community in the simulation results for policy and scientific applications. The characterization of the performance of Models-3/CMAQ is also a tool for the model developers to identify aspects of the modeling system that require further improvement.
Description:
This extended abstract describes recent changes to the Biogenic Emissions Inventory System (BEIS3) that were completed in preparation for the 2005 release of the Community Multiscale Air Quality model. Changes to the model affect the calculated emissions of isoprene and monoterpenes. CMAQ predicted concentrations of ozone and secondary organic aerosols were primarily reduced due to the changes in emissions, and preliminary results indicate slightly improved model performance when compared to observed concentrations. This work will be presented at the 2005 Community Modeling and Analysis System (CMAS) Workshop.