HR: 1340h
AN: B33B-1027    [Abstracts]
TI: Direct Radiative Impacts of Central American Biomass Burning Smoke Aerosols: Analysis from a Coupled Aerosol-Radiation-Meteorology Model RAMS-AROMA
AU: * Wang, J
EM: jwangjun@gmail.com
AF: Department of Atmospheric Science University of Alabama in Huntsville, 320 Sparkman Drive , Huntsville, AL 35805
AU: Christopher, S A
EM: sundar@nsstc.uah.edu
AF: Department of Atmospheric Science University of Alabama in Huntsville, 320 Sparkman Drive , Huntsville, AL 35805
AU: Nair, U S
EM: nair@nsstc.uah.edu
AF: Department of Atmospheric Science University of Alabama in Huntsville, 320 Sparkman Drive , Huntsville, AL 35805
AU: Reid, J S
EM: reid@nrlmry.navy.mil
AF: Naval Research Laboratory, Monterey, 7 Grace Hopper Ave. Stop 2, Monterey, CA 93943
AU: Prins, E M
EM: elaine.prins@ssec.wisc.edu
AF: University of Wisconsin-Madison, Cooperative Institute for Meteorological Satellite Studies (CIMSS) - Consultant, 1225 West Dayton Street , Madison, WI 53706
AB: Considerable efforts including various field experiments have been carried out in the last decade for studying the regional climatic impact of smoke aerosols produced by biomass burning activities in Africa and South America. In contrast, only few investigations have been conducted for Central American Biomass Burning (CABB) region. Using a coupled aerosol-radiation-meteorology model called RAMS-AROMA together with various ground-based observations, we present a comprehensive analysis of the smoke direct radiative impacts on the surface energy budget, boundary layer evolution, and e precipitation process during the CABB events in Spring 2003. Quantitative estimates are also made regarding the transboundary carbon mass to the U.S. in the form of smoke particles. Buult upon the Regional Atmospheric Modeling System (RAMS) mesoscale model, the RAMS AROMA has several features including Assimilation and Radiation Online Modeling of Aerosols (AROMA) algorithms. The model simulates smoke transport by using hourly smoke emission inventory from the Fire Locating and Modeling of Burning Emissions (FLAMBE) geostationary satellite database. It explicitly considers the smoke effects on the radiative transfer at each model time step and model grid, thereby coupling the dynamical processes and aerosol transport. Comparison with ground-based observation show that the simulation realistically captured the smoke transport timeline and distribution from daily to hourly scales. The effects of smoke radiative extinction on the decrease of 2m air temperature (2mT), diurnal temperature range (DTR), and boundary layer height over the land surface are also quantified. Warming due to smoke absorption of solar radiation can be found in the lower troposphere over the ocean, but not near the underlying land surface. The increase of boundary layer stability produces a positive feedback where more smoke particles are trapped in the lower boundary layer. These changes in temperature, surface energy budget and the atmospheric lapse rate have important ramification for the simulation of precipitations.
DE: 3307 Boundary layer processes
DE: 3315 Data assimilation
DE: 3355 Regional modeling
DE: 3359 Radiative processes
DE: 4806 Carbon cycling (0428)
SC: Biogeosciences [B]
MN: Fall Meeting 2005