A selection of new science articles from the past week of interest to the SPARC community (a SPARC Office choice).

A positive zonal wind feedback on sudden stratospheric warming development revealed by CESM2 (WACCM6) reforecasts. By N.A. Davis et al. in the Geophysical Research Letters.

Tropical cyclones reduce ozone in the tropopause region over the western Pacific: An analysis of 18‐year ozonesonde profiles. By D. Li et al. in Earth’s Future.

Very long-period oscillations in the atmosphere (0–110 km). By D. Offermann et al. in Atmospheric Chemistry and Physics. https://doi.org/10.5194/acp-21-1593-2021

Strengthened causal connections between the MJO and the North Atlantic with climate warming. By S.M. Samarasinghe et al. in the Geophysical Research Letters.

Tropopause‐penetrating convection in the extratropics: A satellite‐based investigation for the year 2018. By Y.-X. Shou, F. Lu, and F. Wang in the Quarterly Journal of the Royal Meteorological Society.