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

Observed connections of Arctic stratospheric ozone extremes to Northern Hemisphere surface climate. By D.J. Ivy et al. in Environmental Research Letters.

Climate research must sharpen its view. By J. Marotzke et al. in Nature Climate Change.

Broad Spectrum Mountain Waves. By R.B. Smith and C.G. Kruse in the Journal of Atmospheric Sciences.

Halogen chemistry reduces tropospheric O₃ radiative forcing. By T. Sherwen et al. in Atmospheric Chemistry and Physics.

Introduction to the SPARC Reanalysis Intercomparison Project (S-RIP) and overview of the reanalysis systems. By M. Fujiwara et al. in Atmospheric Chemistry and Physics.

Time-varying changes in the simulated structure of the Brewer–Dobson Circulation. By C.I. Garfinkel et al. in Atmospheric Chemistry and Physics.

Impact of biogenic very short-lived bromine on the Antarctic ozone hole during the 21st century. By R.P. Fernandez et al. in Atmospheric Chemistry and Physics.

Discussion papers – open for comment

Lidar ratios of stratospheric volcanic ash and sulfate aerosols retrieved from CALIOP measurements. By A.T. Prata et al. in Atmospheric Chemistry and Physics Discussions.

MIPAS IMK/IAA Carbon Tetrachloride (CCl₄) Retrieval. By E. Eckert et al. in Atmospheric Measurement Techniques Discussions.