Bottom up Isoprene emissions (open loop)

BVOC gas emissions from vegetation represent a hugely important contributor to the total emission of volatile organic compounds at the global scale. BVOCs in turn play a key role in tropospheric chemistry and impact both the formation of ozone photochemical smog and secondary organic aerosols, which both impact air quality. MEGAN is an open-sourced software package that has been adapted by researchers at NILU to operate with SURFEX model outputs and meteorological data from ECMWF. The MEGAN software calculates emissions of a wide range of BVOCs emitted by plants and aggregates these chemical components into representative chemical species defined in an external chemical mechanism. In our case, this done specifically is for the BVOCs defined (see Table 2 for full list) in the Regional Atmospheric Chemistry Mechanism (Stockwell et al., 1997) that is used in the MOCAGE (Guth et al., 2016) chemical transport model. MOCAGE is being used as the test model the SEEDS project since it is one of the CAMS regional atmospheric chemistry models. https://www.seedsproject.eu/data/isop-ol植被排放的生物源挥发性有机化合物（Biogenic Volatile Organic Compounds, BVOC）在全球挥发性有机化合物总排放量中占据至关重要的份额。BVOCs对流层化学过程发挥关键作用，同时会影响臭氧光化学烟雾与二次有机气溶胶的生成，二者均会对空气质量造成不利影响。 MEGAN是一款开源软件包，由挪威空气研究所（NILU）的研究人员适配，可结合SURFEX模型输出结果与欧洲中期天气预报中心（European Centre for Medium-Range Weather Forecasts, ECMWF）的气象数据运行。该MEGAN软件可计算植物排放的多种BVOCs排放量，并将这些化学组分聚合为外部化学机制中定义的典型化学物种。 在本研究中，此项聚合操作专门针对区域大气化学机制（Regional Atmospheric Chemistry Mechanism，Stockwell等，1997）中定义的BVOCs展开，完整清单见表2。该机制已被应用于MOCAGE（Guth等，2016）化学传输模型。由于MOCAGE是哥白尼大气监测服务（Copernicus Atmosphere Monitoring Service, CAMS）旗下的区域大气化学模型之一，因此被选为SEEDS项目的测试模型。 https://www.seedsproject.eu/data/isop-ol