Description and evaluation of GLOMAP-mode: a modal global aerosol microphysics model for the UKCA composition-climate model
Description and evaluation of GLOMAP-mode: a modal global aerosol microphysics model for the UKCA composition-climate model
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DOI：
10.5194/gmd-3-519-2010
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发表时间：
2010-01-01
影响因子：
5.1
通讯作者：
Johnson, C. E.
中科院分区：
文献类型：
--
作者：
Mann, G. W.;Carslaw, K. S.;Johnson, C. E.
本文介绍了一种新的全球气溶胶过程模型（GLOMAP），它使用了一种双矩伪模态气溶胶动力学方法，而不是原来的双矩bin方案。glomap模式模拟全球多组分气溶胶，分解硫酸盐、海盐、粉尘、黑碳（BC）和颗粒物有机质（POM），后者包括原生POM和生物源次生POM。气溶胶过程以大小分辨的方式进行模拟，包括一次排放、硫酸和水二元均匀成核形成的二次颗粒、通过凝聚、凝结和云处理的颗粒生长以及通过干沉积、云内和云下清除的颗粒去除。收集了一系列基准观测数据集，根据这些数据集，根据归一化平均偏差(b)和相关系数(R)评估模型的技能。总体而言，该模型在模拟气溶胶前体气体浓度、化学形态粒子质量、凝结核（CN）和云凝结核（CCN）方面表现良好。表面硫酸盐、海盐和粉尘质量浓度都被很好地捕获，而BC和POM的偏差较低（但相关性很好）。在自由对流层和海洋站点，表面CN浓度比较合理，但在大陆和沿海站点，由于低估了主要颗粒排放或新颗粒形成，表面CN浓度被低估了。该模型与覆盖一系列环境的CCN观测汇编以及与欧洲大小分辨颗粒浓度的垂直剖面相比较效果良好。模拟的全球负荷、寿命和每个模拟气溶胶组分的湿去除也进行了检查，每个都接近AEROCOM模型相互比较的多模式中值。
A new version of the Global Model of Aerosol Processes (GLOMAP) is described, which uses a two-moment pseudo-modal aerosol dynamics approach rather than the original two-moment bin scheme. GLOMAP-mode simulates the multi-component global aerosol, resolving sulfate, sea-salt, dust, black carbon (BC) and particulate organic matter (POM), the latter including primary and biogenic secondary POM. Aerosol processes are simulated in a size-resolved manner including primary emissions, secondary particle formation by binary homogeneous nucleation of sulfuric acid and water, particle growth by coagulation, condensation and cloud-processing and removal by dry deposition, in-cloud and below-cloud scavenging. A series of benchmark observational datasets are assembled against which the skill of the model is assessed in terms of normalised mean bias (b) and correlation coefficient (R). Overall, the model performs well against the datasets in simulating concentrations of aerosol precursor gases, chemically speciated particle mass, condensation nuclei (CN) and cloud condensation nuclei (CCN). Surface sulfate, sea-salt and dust mass concentrations are all captured well, while BC and POM are biased low (but correlate well). Surface CN concentrations compare reasonably well in free troposphere and marine sites, but are underestimated at continental and coastal sites related to underestimation of either primary particle emissions or new particle formation. The model compares well against a compilation of CCN observations covering a range of environments and against vertical profiles of size-resolved particle concentrations over Europe. The simulated global burden, lifetime and wet removal of each of the simulated aerosol components is also examined and each lies close to multi-model medians from the AEROCOM model intercomparison exercise.