Global 2-D intercomparison of sectional and modal aerosol modules
Global 2-D intercomparison of sectional and modal aerosol modules
复制标题
截面和模态气溶胶模块的全局二维相互比较
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
Xiaohong Liu
中科院分区：
文献类型：
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作者：
D. Weisenstein;J. Penner;M. Herzog;Xiaohong Liu
我们提出了一个相互比较的几个气溶胶模块，截面和模态，在全球2-D模式，以区分他们的行为对流层和平流层的应用。在这项研究中，我们只模拟二元硫酸-水气溶胶。三个版本的截面模型和三个版本的模态模型被用来测试的敏感性的背景气溶胶质量和尺寸分布的箱或模式的数量和规定的宽度的最大模式。我们发现对分段模型中使用的箱数（40对150）的敏感性适中。气溶胶质量被认为是减少在模态模型中，如果不小心选择的最大对数正态模式的宽度，反映在平流层中部的沉积差异。在大多数情况下，但不是所有情况下，由截面模型计算的尺寸分布可以更好地与具有四个模式而不是三个模式的模式模型相匹配。1991年火山爆发后气溶胶衰减的模拟。皮纳图博表明，尺寸分布的代表性可以有一个显着的影响模型计算的平流层气溶胶衰减率。在1991年和1995年之间，气溶胶消光和表面积密度计算的两个版本的模态模式充分匹配的结果从截面模式。同一时间段的计算有效半径显示出更多的模型间变异性，20箱截面模型的表现比任何模态模型都好得多。
We present an intercomparison of several aerosol modules, sectional and modal, in a global 2-D model in order to differentiate their behavior for tropospheric and stratospheric applications. We model only binary sulfuric acid-water aerosols in this study. Three versions of the sectional model and three versions of the modal model are used to test the sensitivity of background aerosol mass and size distribution to the number of bins or modes and to the prescribed width of the largest mode. We find modest sensitivity to the number of bins (40 vs. 150) used in the sectional model. Aerosol mass is found to be reduced in a modal model if care is not taken in selecting the width of the largest lognormal mode, reflecting differences in sedimentation in the middle stratosphere. The size distributions calculated by the sectional model can be better matched by a modal model with four modes rather than three modes in most but not all situations. A simulation of aerosol decay following the 1991 eruption of Mt. Pinatubo shows that the representation of the size distribution can have a signficant impact on model-calculated aerosol decay rates in the stratosphere. Between 1991 and 1995, aerosol extinction and surface area density calculated by two versions of the modal model adequately match results from the sectional model. Calculated effective radius for the same time period shows more intermodel variability, with a 20-bin sectional model performing much better than any of the modal models.