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-2018-1337
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发表时间：
2019
期刊：
影响因子：
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通讯作者：
D. Watson‐Parris;N. Schutgens;C. Reddington;K. Pringle;Dantong Liu;J. Allan;H. Coe;K. Carslaw;P. Stier
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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，但人们对全球气溶胶的垂直分布知之甚少。这反过来导致直接和间接气溶胶强迫对气候的贡献存在很大的不确定性。利用全球气溶胶合成和科学项目 (GASSP) 数据库（目前可用的最大的现场飞机测量综合集合，包含来自世界各地 37 个活动的 1000 多个航班），我们研究了广泛地区和环境中亚微米气溶胶的垂直结构。应用这个独特的数据集来评估全球气溶胶气候模型 ECHAM-HAM 中的数量大小分布和云凝结核 (CCN) 的垂直分布表明，该模型低估了对流层上层的累积模式粒子，尤其是在偏远地区。使用不同的气溶胶微物理方案和过程敏感性分析来探索这种差异背后的过程。这些表明偏差主要与气溶胶老化和去除有关，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 sub-micron 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.