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An AeroCom initial assessment – optical properties in aerosol component modules of global models

机译：AeroCom初始评估–全局模型的气雾剂组件模块中的光学性能

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The AeroCom exercise diagnoses multi-component aerosol modules in globalmodeling. In an initial assessment simulated global distributions for massand mid-visible aerosol optical thickness (aot) were compared among 20different modules. Model diversity was also explored in the context ofprevious comparisons. For the component combined aot general agreement hasimproved for the annual global mean. At 0.11 to 0.14, simulated aot valuesare at the lower end of global averages suggested by remote sensing fromground (AERONET ca. 0.135) and space (satellite composite ca. 0.15). Moredetailed comparisons, however, reveal that larger differences in regionaldistribution and significant differences in compositional mixture remain. Ofparticular concern are large model diversities for contributions by dust andcarbonaceous aerosol, because they lead to significant uncertainty inaerosol absorption (aab). Since aot and aab, both, influence the aerosolimpact on the radiative energy-balance, the aerosol (direct) forcinguncertainty in modeling is larger than differences in aot might suggest. Newdiagnostic approaches are proposed to trace model differences in terms ofaerosol processing and transport: These include the prescription of commoninput (e.g. amount, size and injection of aerosol component emissions) andthe use of observational capabilities from ground (e.g. measurementsnetworks) or space (e.g. correlations between aerosol and clouds).
机译：AeroCom演习在全局建模中诊断多组分气溶胶模块。在初步评估中，比较了20个不同模块之间质量和中可见气溶胶光学厚度（aot）的模拟全局分布。在以前的比较中也探索了模型多样性。对于组成部分的组合aot，通用协议已针对年度全球平均值进行了改进。在0.11到0.14之间，模拟的aot值位于地面（AERONET大约0.135）和太空（卫星复合材料大约0.15）的遥感建议的全球平均值的低端。然而，更详细的比较表明，区域分布的较大差异和成分混合的显着差异仍然存在。特别令人关注的是灰尘和碳质气溶胶的模型差异很大，因为它们导致气溶胶吸收（aab）的不确定性。由于aot和aab都影响气溶胶对辐射能量平衡的影响，因此建模中的气溶胶（直接）强迫不确定性大于aot可能表明的差异。提出了新的诊断方法来追踪模型在气溶胶加工和运输方面的差异：这些方法包括共同输入的处方（例如，气溶胶成分排放的数量，大小和注入）以及对地面（例如测量网络）或空间的观测能力的使用（例如气溶胶和云）。

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