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

Seasonal and interannual variations in HCN amounts in the upper troposphere and lower stratosphere observed by MIPAS. By N. Glatthor et al. in Atmospheric Chemistry and Physics.

Influence of ENSO on the QBO: Results from an ensemble of idealized simulations. By S. Schirber in the Journal of Geophysical Research: Atmospheres.

Circulation response to warming shaped by radiative changes of clouds and water vapour. By A. Voigt and T.A. Shaw in Nature Geoscience.

Validation of OMI total ozone retrievals from the SAO ozone profile algorithm and three operational algorithms with Brewer measurements. By J. Bak et al. in Atmospheric Chemistry and Physics.

Discussion papers – open for comment

An objective determination of optimal site locations for detecting expected trends in upper-air temperature and total column ozone. By K. Kreher et al. in Atmospheric Chemistry and Physics Discussions.