In situ constraints on the vertical distribution of global aerosol
In situ constraints on the vertical distribution of global aerosol
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DOI：
10.5194/acp-19-11765-2019
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发表时间：
2019-09
影响因子：
6.3
通讯作者：
D. Watson‐Parris;N. Schutgens;C. Reddington;K. Pringle;Dantong Liu;J. Allan;H. Coe;K. Carslaw;P. Stier
中科院分区：
文献类型：
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作者：
D. Watson‐Parris;N. Schutgens;C. Reddington;K. Pringle;Dantong Liu;J. Allan;H. Coe;K. Carslaw;P. Stier
抽象的。尽管不断努力，全球气溶胶的垂直分布知之甚少。这反过来又导致气溶胶对气候的直接和间接强迫作用存在很大的不确定性。使用全球气溶胶合成和科学项目（GASSP）数据库-目前最大的现场飞机测量综合收集，来自世界各地的37个活动的1000多个航班-我们调查了各种区域和环境中亚微米气溶胶的垂直结构。这个独特的数据集的应用程序来评估的垂直分布的数量大小分布和云凝结核（CCN）在全球气溶胶气候模式ECHAM-HAM显示，该模型低估了积累模式粒子在对流层上部，特别是在偏远地区。使用不同的气溶胶微物理方案和过程的敏感性分析，探索这种差异的过程。这些数据表明，偏差主要与气溶胶老化和清除有关，而不是与排放有关。
Abstract. Despite ongoing efforts, the vertical distribution of aerosols globally is poorly understood. This in turn leads to large uncertainties in the contributions of the direct and indirect aerosol forcing on climate. Using the Global Aerosol Synthesis and Science Project (GASSP) database – the largest synthesised collection of in situ aircraft measurements currently available, with more than 1000 flights from 37 campaigns from around the world – we investigate the vertical structure of submicron aerosols across a wide range of regions and environments. The application of this unique dataset to assess the vertical distributions of number size distribution and cloud condensation nuclei (CCN) in the global aerosol–climate model ECHAM-HAM reveals that the model underestimates accumulation-mode particles in the upper troposphere, especially in remote regions. The processes underlying this discrepancy are explored using different aerosol microphysical schemes and a process sensitivity analysis. These show that the biases are predominantly related to aerosol ageing and removal rather than emissions.