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

Impact of Lagrangian transport on lower-stratospheric transport timescales in a climate model. By E.J. Charlesworth et al. in Atmospheric Chemistry and Physics.

Pollution trace gas distributions and their transport in the Asian monsoon upper troposphere and lowermost stratosphere during the StratoClim campaign 2017. By S. Johansson et al. in Atmospheric Chemistry and Physics.

Role of equatorial waves and convective gravity waves in the 2015/16 quasi-biennial oscillation disruption. By M.-J. Kang, H.-Y. Chun, and R.R. Garcia in Atmospheric Chemistry and Physics.

50 years of balloon-borne ozone profile measurements at Uccle, Belgium: short history, scientific relevance and achievements in understanding the vertical ozone distribution. By R. Van Maleren et al. in Atmospheric Chemistry and Physics.

Infrequent, Rapid Transport Pathways to the Summer North American Upper Troposphere and Lower Stratosphere. By X. Wang, W. Randel, and W. Yutian in the Geophysical Research Letters.

Discussion papers – open for comment:

A multi-sensor satellite-based archive of the largest SO2 volcanic eruptions since 2006. By P.-Y. Tournigand et al. in Earth System Science Data.