This special issue includes the publications which are published under the remit of the collaborative research centre The tropopause region in a changing atmosphere (TPChange) that started in 2021. The consortium under the umbrella of this project constitutes experts from gas-phase and aerosol chemistry relevant to the transport and composition of the tropopause region. It covers new measurements and developments as well as process-oriented and global modelling of processes that concern this climate-relevant region. The purpose of TPChange is to develop deeper understanding of the role of tropopause processes (often sub-grid to global modelling) in the light of climate change.

Review process: This inter-journal special issue co-lists papers of different journals. Thereby, each paper was submitted to 1 particular journal and underwent the regular interactive peer-review process of that journal. Depending on the journal, the peer review was handled by regular members of the editorial board and/or by guest editors designated by the journal’s chief/executive editors.