中国西南和华南地区硫沉降数值模拟

利用CMAQ(Community Multi-scale Air Quality)模式模拟了中国西南和华南地区的硫沉降。模式中详细考虑了气象过程、气相与液相化学过程、非均相化学过程、气溶胶过程和干湿沉降过程对SO2输送、转化和沉降过程的影响。通过与IMPACTS小流域的观测资料的比较,显示了该模式系统能够较好地模拟SO2在大气中的转化以及干湿沉降过程。在此基础之上,分析了不同季节该区域的硫沉降和向外输送的情况,并且模拟了该区域2002年全年的硫沉降分布状况,这为该区域有效地污染治理奠定了基础。

Numerical Modeling of Sulfur Deposition in South and Southwest China

The deposition of SO2 in South and Southwest China was modulated by using the Models-3 Community Multi-Scale Air Quality(CMAQ) modeling system with meteorological fields calculated by The Fifth-Generation NCAR/PSU Mesoscale Model(MM5).The impacts of meteorological processes,gas-phase chemistry,aqueous-phase chemistry,aerosol processes,heterogeneous chemistry and deposition processes upon sulfur transport,transformation and deposition were comprehensive considered.Modeled values of sulfur dioxide and sulfur deposition were compared with observations obtained from the Integrated Monitoring Program on Acidification of Chinese Terrestrial Systems(IMPACTS) in 2002.The compared result shows that the simulated values are consistent with the observations.On this bases,we analysis sulfur deposition and transmission during different seasons,and modulate the distribution of sulfur deposition in Southern and Southwestern China in 2002,it will be contributed to control and manage the environment of this region.