A parameterization of aerosol activation 2. Multiple aerosol types
A parameterization of aerosol activation 2. Multiple aerosol types
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DOI：
10.1029/1999jd901161
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发表时间：
2000-03-16
影响因子：
4.4
通讯作者：
Ghan, SJ
中科院分区：
文献类型：
--
作者：
Abdul-Razzak, H;Ghan, SJ
对数正态分布的气溶胶形成云滴的激活的参数化扩展到多个外部混合对数正态模式的情况下，每个组成的可溶性和不溶性材料的均匀内部混合物。科勒理论用于将气溶胶尺寸分布和组成与作为最大过饱和度的函数的活化数相关联。过饱和天平用于确定最大过饱和度，说明颗粒活化前后的颗粒生长。两个竞争的参数化激活的比较：气溶胶模式与详细的数值模拟的激活过程产生协议在10%以内的各种条件下，包括不同的尺寸分布，数浓度：组合物，和上升气流速度。只有当两种尺寸分布的模式半径相差一个数量级时，参数化误差才超过10%。活化的质量分数的误差总是比活化的数量分数的误差小得多。
A parameterization of the activation of a lognormal size distribution of aerosols to form cloud droplets is extended to the case of multiple externally mixed lognormal modes, each composed of a uniform internal mixture of soluble and insoluble material. The Kohler theory is used to relate the aerosol size distribution and composition to the number activated as a function of maximum supersaturation. The supersaturation balance is used to determine the maximum supersaturation, accounting for particle growth both before and after the particles are activated. Comparison of the parameterized activation of two competing: aerosol modes with detailed numerical simulations of the activation process yields agreement to within 10% under a wide variety of conditions, including diverse size distributions, number concentrations: compositions, and updraft velocities. The parametization error exceeds 10% only when the mode radius of the two size distributions differs by an order of magnitude. Errors for the mass fraction activated are always much less than errors for the number fraction activated.