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

More-Persistent Weak Stratospheric Polar Vortex States Linked to Cold Extremes. By M. Kretschmer et al. in the Bulletin of the American Meteorological Society.

Modeling Seasonal Sudden Stratospheric Warming Climatology Based on Polar Vortex Statistics. By M.F. Horan and T. Reichler in the Journal of Climate.

Seasonal sensitivity of the Northern Hemisphere jet-streams to Arctic temperatures on subseasonal timescales. By E.A. Barnes and I.R. Simpson in the Journal of Climate.

Development of a Polar Stratospheric Cloud Model within the Community Earth System Model: Assessment of 2010 Antarctic Winter. By Y. Zhu et al. in the Journal of Geophysical Research: Atmospheres.

Brominated VSLS and their influence on ozone under a changing climate. By S. Falk et al. in Atmospheric Chemistry and Physics.

Ozone comparison between Pandora #34, Dobson #061, OMI, and OMPS in Boulder, Colorado, for the period December 2013–December 2016. By J. Herman et al. in Atmospheric Measurement Techniques.

An “island” in the stratosphere – on the enhanced annual variation of water vapour in the middle and upper stratosphere in the southern tropics and subtropics. By S. Lossow et al. in Atmospheric Chemistry and Physics.

Reanalysis comparisons of upper tropospheric–lower stratospheric jets and multiple tropopauses. By G.L. Manney et al. in Atmospheric Chemistry and Physics.

Snow-(N)AO teleconnection and its modulation by the Quasi-Biennal Oscillation. By Y. Peings et al. in the Journal of Climate.

Common Warming Pattern Emerges Irrespective of Forcing Location. By S.M. Kang et al. in the Journal of Advances in Modeling Earth Systems.

Potential impact of carbonaceous aerosol on the upper troposphere and lower stratosphere (UTLS) and precipitation during Asian summer monsoon in a global model simulation. By S. Fadnavis et al. in Atmospheric Chemistry and Physics.

Discussion papers – open for comment

Harmonisation and trends of 20-years tropical tropospheric ozone data. By E. Leventidou et al. in Atmospheric Chemistry and Physics Discussions.