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

Contribution of changes in atmospheric circulation patterns to extreme temperature trends. By D.E. Horton et al. in Nature.

Drivers of the recent tropical expansion in the Southern Hemisphere: Changing SSTs or ozone depletion? By D.W. Waugh et al. in the Journal of Climate.

A Chemistry-Climate Model Study of Past Changes in the Brewer-Dobson Circulation. By S. Oberländer-Hayn et al. in the Journal of Geophysical Research: Atmospheres.

Nonlinear response of modelled stratospheric ozone to changes in greenhouse gases and ozone depleting substances in the recent past. By S. Meul et al. in Atmospheric Chemistry and Physics.

The 11-year solar cycle in current reanalyses: a (non)linear attribution study of the middle atmosphere. By A. Kuchar et al. in Atmospheric Chemistry and Physics.

The impact of ozone depleting substances on the circulation, temperature and salinity of the Southern Ocean: An attribution study with CESM1(WACCM). By A. Solomon et al. in Geophysical Research Letters.