Solar variability Impacts on the chemical Composition of the Middle Atmosphere: measurements and model predictions (SICMA III)

该项目的目标是，利用一套适当的大气模型和模型验证测量数据，调查太阳变化对中间层和平流层化学成分的影响，以解决以下问题：1）我们是否了解大型太阳粒子事件期间的化学和离子化学过程，2）这些过程对中层大气的化学成分，特别是对平流层氮氧化物和臭氧收支的长期影响，和3）这是如何比较其他太阳变化的影响，如银河宇宙射线，太阳辐射的变化，和热层氮氧化物的下降？为了解决这些问题，我们将改进现有的中层大气离子化学模型以及平流层和中间层的全球三维和二维化学和传输模型。将进行模型实验，涵盖在变化的大气层中发生非常大的太阳粒子事件的时期以及至少一个太阳周期的长时期。

The goal of this project is to investigate the impact of solar variability on the chemical composition of the mesosphere and stratosphere using a suitable set of atmospheric models together with measurements for model validation to address the following questions:1) Do we understand chemical and ion-chemistry processes during large solar particle events,2) what is the long-term impact of these processes onto the chemical composition of the middle atmosphere, especially onto the stratospheric NOx and ozone budget, and 3) how does this compare to other solar variability effects like galactic cosmic rays, solar radiation variability, and downwelling of thermospheric NOx ? To address these issues, our existing ionchemistry model of the middle atmosphere as well as global three-dimensional and two-dimensional chemistry and transport models of the stratosphere and mesosphere will be improved. Model experiments will be carried out covering periods of very large solar particle events in a changing atmosphere as well as long periods of at least one solar cycle.