中国一次生物气溶胶排放及其对大气有机气溶胶的影响的模式研究

有机碳气溶胶是大气气溶胶中非常重要的组成部分，然而目前对有机碳的来源并不十分清楚，逐渐增多的一些观测研究指出一次生物气溶胶（如真菌孢子、花粉颗粒和细菌等）可能是有机碳的重要来源，并且对气候变化、空气质量和人类健康有重要的影响。但当前一次生物气溶胶对大气中有机碳气溶胶的贡献研究非常有限，这一认识的局限性可能是现有模式模拟与观测存在较大的误差的原因之一。针对这一科学问题，同时也为了提高当前模式的模拟能力，本项目拟基于全球大气化学传输模式GEOS-Chem和已有的研究基础，在模式中增加陆地生态系统排放的一次生物气溶胶的参数化方案并结合已有的一次生物气溶胶观测数据优化模型参数，利用可获得的污染物观测数据对改进模式进行验证，考察中国地区陆地生态系统一次生物气溶胶排放的空间分布和季节变化特征，重点分析一次生物气溶胶对大气有机气溶胶的贡献，定量评估植被参数或气象参数变化对一次生物气溶胶排放的影响。

Although a significant fraction of atmospheric aerosols is organic carbon (OC), the sources of organic carbon are not always certain. Recently research suggest that one potential source of atmospheric OC is primary biological aerosols partices (PBAPs), such as fungal spores, pollen and bacteria, which might have important impacts on climate change, air quality and human health. However, the contribution of PBAPs to the global budget of organic carbon is poorly understood. And most of global chemical transport models (CTM) largely underpredicted OC concentrations in comparison with the observation. In order to figure out this problem and improve the veracity, we try to implement the emission parametrization for fungal spores, pollen and bacteria based on recent literature in the CEOS-Chem global chemical transport model. We optimize the parameters in the emission parametrization scheme by using the PBAP observation data in China. And then we validate the updated model by using the observation data. The spatial distribution and seasonal variations of PBAPs in China are investigated by the following simulation. The purpose of our study is to analyse the contribution of PBAP to the organic aerosols and to quantify the impacts of environment driven factors on the PBAPs emission.