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

Differences in Vertical Structure of the Madden‐Julian Oscillation Associated with the Quasi‐Biennial Oscillation. By H.H. Hendon and S. Abhik in the Geophysical Research Letters

Long‐term variation in the mixing fraction of tropospheric and stratospheric air masses in the upper tropical tropopause layer. By Y. Inai in the Journal of Geophysical Research: Atmospheres.

Mixing and ageing in the polar lower stratosphere in winter 2015–2016. By J. Krause et al. in Atmospheric Chemistry and Physics.

Discussion papers – open for comment

A rescued dataset of sub-daily meteorological observations for Europe and the southern Mediterranean region, 1877–2012. By L. Ashcroft et al. in Earth System Science Data Discussions.

An updated version of a gap-free monthly mean zonal mean ozone database. By B. Hassler et al. in Earth System Science Data Discussions.

Lidar temperature series in the middle atmosphere as a reference data set. Part B: Assessment of temperature observations from MLS/Aura and SABER/TIMED satellites. By R. Wing et al. in Atmospheric Measurement Techniques Discussions.