Chloe Yuchao Gao, Susanne E. Bauer, Kostas Tsigaridis, Ulas Im
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To assess the performance of the new model, we compared its mass concentration, number concentration, and activated number concentration to the original scheme MATRIX, and evaluated its mass concentrations in four seasons against data from the NASA Atmospheric Tomography Mission (ATom) aircraft campaign. Results from MATRIX-VBS show that organics are transported further away from their source, and their mass concentration increases aloft and decreases at the surface compared to those in MATRIX. The mass concentration of organics at the surface agrees well with measurements, and there are discrepancies for vertical profiles aloft. In the new scheme, the global mass load of organic aerosols increased by 50%, there is also an increased number of particles at the surface and fewer activated ones in most regions. 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引用次数: 0
摘要
我们介绍了 MATRIX-VBS,这是一种在气溶胶微物理模型中模拟有机物分区的新气溶胶方案,是 NASA GISS ModelE 地球系统模型的一部分。MATRIX-VBS建立在其前身气溶胶微物理模型MATRIX(Bauer等人,2008年,https://doi.org/10.5194/acp-8-6003-2008)的基础上,是在盒式模型框架内开发的(Gao等人,2017年,https://doi.org/10.5194/gmd-10-751-2017)。该方案的特点是纳入了气相和颗粒相之间的有机物分配,以及使用挥发性基础集的光化学老化过程(Donahue 等人,2006 年,https://doi.org/10.1021/es052297c)。为了评估新模型的性能,我们将其质量浓度、数量浓度和活化数量浓度与原始方案 MATRIX 进行了比较,并根据 NASA 大气断层扫描任务(ATom)飞机活动的数据评估了其在四个季节的质量浓度。MATRIX-VBS 的结果表明,与 MATRIX 的结果相比,有机物的传输距离更远,其质量浓度在高空增加,在地表降低。地表有机物的质量浓度与测量结果十分吻合,而高空的垂直剖面则存在差异。在新方案中,全球有机气溶胶的质量负荷增加了 50%,地表的颗粒数量也增加了,大多数地区的活化颗粒数量减少了。新方案在模拟气溶胶过程方面具有更先进、更全面的能力。
Global Influence of Organic Aerosol Volatility on Aerosol Microphysical Processes: Composition and Number
We present MATRIX-VBS, a new aerosol scheme that simulates organic partitioning in an aerosol microphysics model, as part of the NASA GISS ModelE Earth System Model. MATRIX-VBS builds on its predecessor aerosol microphysics model MATRIX (Bauer et al., 2008, https://doi.org/10.5194/acp-8-6003-2008) and was developed in the box model framework (Gao et al., 2017, https://doi.org/10.5194/gmd-10-751-2017). The scheme features the inclusion of organic partitioning between the gas and particle phases and the photochemical aging process using the volatility-basis set (Donahue et al., 2006, https://doi.org/10.1021/es052297c). To assess the performance of the new model, we compared its mass concentration, number concentration, and activated number concentration to the original scheme MATRIX, and evaluated its mass concentrations in four seasons against data from the NASA Atmospheric Tomography Mission (ATom) aircraft campaign. Results from MATRIX-VBS show that organics are transported further away from their source, and their mass concentration increases aloft and decreases at the surface compared to those in MATRIX. The mass concentration of organics at the surface agrees well with measurements, and there are discrepancies for vertical profiles aloft. In the new scheme, the global mass load of organic aerosols increased by 50%, there is also an increased number of particles at the surface and fewer activated ones in most regions. The new scheme presents advanced and more comprehensive capability in simulating aerosol processes.
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