A two‐dimensional model of sulfur species and aerosols
A two‐dimensional model of sulfur species and aerosols
复制标题
硫物质和气溶胶的二维模型
DOI：
10.1029/97jd00901
复制
发表时间：
1997
影响因子：
--
通讯作者：
C. Scott
中科院分区：
文献类型：
--
作者：
D. Weisenstein;G. Yue;M. Ko;N. Sze;José María Rodríguez;C. Scott
本文建立了一个硫酸盐气溶胶的二维模式。该模型包括硫酸盐前体物质H2S、CS2、DMS、OCS和SO2。模拟的微物理过程包括均质成核、凝结和蒸发、凝聚和沉降。对流层气溶胶通过冲刷过程和表面沉积而被清除。我们假设所有的气溶胶都是严格的二元水-硫酸溶液，没有固体核。平流层凝结核的主要来源是热带对流层上部均匀成核形成的新粒子。一个重要的发现是平流层气溶胶质量可能强烈地受到对流层深对流的影响。这一过程可以将气相硫酸盐前体输送到对流层上部，并导致那里的SO2水平升高，这可能会使平流层气溶胶质量比单独由接触网光氧化产生的质量增加一倍。我们的模型是成功的复制皮纳图博火山爆发后平流层气溶胶负载的大小，但计算出的速度从平流层的气溶胶的衰减比来自观测。
A two-dimensional model of sulfate aerosols has been developed. The model includes the sulfate precursor species H2S, CS2, DMS, OCS, and SO2. Microphysical processes simulated are homogeneous nucleation, condensation and evaporation, coagulation, and sedimentation. Tropospheric aerosols are removed by washout processes and by surface deposition. We assume that all aerosols are strictly binary water-sulfuric acid solutions without solid cores. The main source of condensation nuclei for the stratosphere is new particle formation by homogeneous nucleation in the upper tropical troposphere. A signficant finding is that the stratospheric aerosol mass may be strongly influenced by deep convection in the troposphere. This process, which could transport gas-phase sulfate precursors into the upper troposphere and lead to elevated levels of SO2 there, could potentially double the stratospheric aerosol mass relative to that due to OCS photooxidation alone. Our model is successful at reproducing the magnitude of stratospheric aerosol loading following the Mount Pinatubo eruption, but the calculated rate of decay of aerosols from the stratosphere is faster than that derived from observations.