Quantification of Indirect Combustion Aerosol Impacts on Cirrus Clouds
The goal of our research is to increase the state of scientific understanding of black carbon (BC)/cloud/climate interactions and to provide a realistic assessment of the effects of fossil fuel combustion on climate. The major sources of BC emitted by transport (road, aviation, shipping) are characterized with an emphasis on the key particle properties responsible for interaction with water. The relationship between soot physico-chemistry and the effects of soot on cloud microphysics is proposed based on the concept of the quantification of water uptake which allows the separation of BC aerosols into hydrophobic, hydrophilic, and hygroscopic (3-BC scheme). To better quantify the role of fossil fuel burning BC in climate change, a 3-BC scheme is developed to replace the 1-BC scheme in a coupled climate and aerosol transport model (CAM-IMPACT). The new scheme explicitly calculates the aging of emitted BC aerosols due to condensation of gas phase sulfate and coagulation of pure sulfate aerosols with BC aerosols. The hygroscopicity of BC is determined by the layers of sulfate coating on their surface according to criteria developed in laboratory observations. This approach allows the identification of the range of BC hygroscopicity responsible for heterogeneous ice nucleation in cirrus clouds and the most significant effects of combustion aerosol on climate forcing.
fossil fuel BC aerosol water uptake heterogeneous ice nucleation cirrus clouds
Olga Popovicheva Yuxing Yu Joyce E. Penner
Institute of Nuclear Physics,Moscow State University,Moscow,119991,Russia AOSS,University of Michigan,Ann Arbor,MI 48105
国际会议
西安
英文
530-536
2011-08-17（万方平台首次上网日期，不代表论文的发表时间）