Towards an All-Inclusive Earth System model (TIES): Merging lower, middle and upper atmospheric models to study solar effects

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The processes in the environment of our planet are governed by two major drivers: The variability of the lower and middle atmosphere is mostly influenced by processes originating at the surface, while the variability of the upper atmosphere is controlled by solar variability. Traditionally different numerical models have been used to study these regimes, although they are neither distinct regions nor completely independent drivers. Waves from the lower atmosphere can have large effects in the upper atmosphere, and solar variability can have severe effects at least down to the middle stratosphere. The aim of the TIES project is to bridge the gap between meteorology and space science because such atmospheric coupling can only be captured and understood in models describing all involved regions consistently. An innovative whole atmosphere model will be created by coupling two models that in combination very well describe the lower, middle and upper atmosphere. This tool will be used for investigations of the impact of solar variability on the atmosphere. Scientific focus will be on ozone depleting NOy species that are produced by particle precipitation and their interactions with polar chemistry and dynamics, as well as the transfer of the solar signal through vertical coupling by atmospheric waves. Expertise and data from other CAWSES projects (ARTOSAIMOS, ProSECCO) will aid these investigations.